ORCID Profile
0000-0001-7509-8653
Current Organisations
Guangzhou University
,
Curtin University
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Civil Engineering | Structural Engineering | Structural Engineering | Construction Materials | Earthquake Engineering | Information Systems Management | Geotechnical Engineering | Interdisciplinary Engineering Not Elsewhere Classified | Research, Science And Technology Policy | Interdisciplinary Engineering | Engineering Systems Design | Infrastructure Engineering and Asset Management | Civil Engineering Not Elsewhere Classified | Pattern Recognition and Data Mining | Energy Generation, Conversion and Storage Engineering | Ship and Platform Structures | Risk Engineering (excl. Earthquake Engineering) |
ANZSRC Socio-Economic Objective (SEO)
Civil Construction Design | Other | Cement and Concrete Materials | Commercial Construction Design | Technological and organisational innovation | Civil Construction Processes | Other | Expanding Knowledge in Engineering | Energy Storage, Distribution and Supply not elsewhere classified | Residential Construction Design | Industrial Construction Design | Metals (e.g. Composites, Coatings, Bonding) | Civil | Emerging Defence Technologies | Personnel | Expanding Knowledge in Built Environment and Design | Expanding Knowledge in Technology | Oil and Gas Exploration | Natural Hazards in Marine Environments | Computer software and services not elsewhere classified | Civil | Civil | Construction Materials Performance and Processes not elsewhere classified | Ground transport not elsewhere classified | Electricity, gas and water services and utilities | Health Protection and/or Disaster Response
Related Links
Publications
Static and dynamic properties of novel ambient-cured lightweight geopolymer composites with fibre reinforced epoxy coated EPS aggregates
Publisher: Elsevier BV
Date: 02-2023
Shake-table tests of BFRP-reinforced geopolymer concrete segmental columns
Publisher: Springer Science and Business Media LLC
Date: 16-08-2022
Investigation on the dynamic bond-slip behaviour between steel bar and concrete
Publisher: Elsevier BV
Date: 10-2023
Numerical investigation of flexural behaviours of precast segmental concrete beams internally post-tensioned with unbonded FRP tendons under monotonic loading
Publisher: Elsevier BV
Date: 12-2021
Superelastic CuAlBe wire-based sliding lead rubber bearings for seismic isolation of bridges in cold regions
Publisher: Elsevier BV
Date: 11-2021
Preliminary study of the structure and support forms to mitigate blast and impact loading effects
Publisher: CRC Press
Date: 18-11-2011
DOI: 10.1201/B10571-108
Effect of High Speed Rail Transit and Impact Loads on Ballast Degradation
Publisher: Springer International Publishing
Date: 30-11-2015
Damage detection using artificial neural network with consideration of uncertainties
Publisher: Elsevier BV
Date: 11-2007
Structural damage identification by sparse deep belief network using uncertain and limited data
Publisher: Hindawi Limited
Date: 03-02-2020
DOI: 10.1002/STC.2522
Experimental study of dynamic buckling of plates under fluid-solid slamming
Publisher: Elsevier BV
Date: 08-1999
Dynamic behaviors of butt welds and fillet welds under intermediate strain rate
Publisher: Elsevier BV
Date: 02-2023
Behavior of Precast Segmental Concrete Beams Prestressed with External Steel and CFRP Tendons
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2020
Performance of an innovative self-centering buckling restrained brace for mitigating seismic responses of bridge structures with double-column piers
Publisher: Elsevier BV
Date: 10-2017
Effectiveness of using rubber bumper and restrainer on mitigating pounding and unseating damage of bridge structures subjected to spatially varying ground motions
Publisher: Elsevier BV
Date: 11-2013
Characteristics of free air blast loading due to simultaneously detonated multiple charges
Publisher: World Scientific Pub Co Pte Lt
Date: 02-04-2014
DOI: 10.1142/S0219455414500023
Abstract: Extensive research has been conducted to investigate the characteristics of blast load due to single charge explosion, including numerical simulations and experimental blast tests in both unconfined and confined environments. Further, available guidelines for blast resistant design such as UFC-3-340-02 (2008) and ASCE 59-11 (2011) provide details to predict blast loads on a structure subjected to single charge explosion. However, blast load characteristics due to multiple charge explosions are poorly discussed in available literature. In this paper, commercially available Hydrocode, AUTODYN is calibrated for single charge explosions. Based on a comparison between numerical simulation and UFC prediction, correction factors for peak reflected pressure and positive reflected impulse as a function of charge weight, scaled distance and mesh size of the numerical model are proposed to minimize the errors in simulations. The calibrated AUTODYN model is then used to conduct parametric studies to investigate the effects of charge weight, scaled distance, number of charges and distance between the charges on the characteristics of free air blast load due to simultaneous detonated multiple charges. Numerical simulation results are used to derive analytical formulas for predictions of peak reflected pressure ratio and positive reflected impulse ratio between single and multiple explosions. The discussion is made on characteristics of free air blast load due to simultaneous detonated multiple charges.
Bridge condition monitoring using fixed moving principal component analysis
Publisher: Hindawi Limited
Date: 24-02-2020
DOI: 10.1002/STC.2535
Structural damage identification using improved Jaya algorithm based on sparse regularization and Bayesian inference
Publisher: Elsevier BV
Date: 10-2019
Numerical analysis of dynamic responses of laminated glass window subjected to gas explosions
Publisher: Elsevier BV
Date: 07-2021
Multiple excitation effects on response of symmetric buildings
Publisher: Elsevier BV
Date: 09-1996
Vulnerability Analyses of Structural Insulated Panels with OSB Skins Strengthened by Basalt Fiber Cloth Subjected to Windborne Debris Impact
Publisher: World Scientific Pub Co Pte Ltd
Date: 06-2018
DOI: 10.1142/S0219455418500888
Abstract: In this study, numerical simulations are conducted with a verified model to develop damage threshold curves for structural insulated panels (SIPs) with OSB skins strengthened by basalt fiber cloth subjected to windborne debris impact. Numerical models of the SIP with OSB skins strengthened by basalt fibre cloth at the front or back side are developed by using LS-DYNA. The accuracy of the numerical model is verified by comparing numerical results with laboratory testing data. Using the verified numerical model, intensive simulations are conducted to examine the influence of various parameters, including thickness of basalt fiber, location of basalt fiber layer, bonding strength between the basalt fiber cloth and the OSB skin, on the dynamic responses of the SIP. The debris penetration or fracture of the strengthened SIP that creates an opening is defined as failure of the panel in this study. Empirical formulae are derived on the basis of the numerical results to predict the thresholds of penetration velocity and projectile mass that lead to failure of the SIP. The empirical formulae can be straightforwardly used to assess the performance of the SIP with OSB skins strengthened by basalt fiber cloth subjected to windborne debris impact.
Behaviours of column-in-column (CIC) system under axial compression: Experimental and theoretical studies
Publisher: Elsevier BV
Date: 05-2022
Localization of free-spanning damage using mode shape curvature
Publisher: IOP Publishing
Date: 19-07-2011
Experimental confirmation of some factors influencing dynamic concrete compressive strengths in high-speed impact tests
Publisher: Elsevier BV
Date: 10-2013
Experimental study on relative displacement responses of bridge frames subjected to spatially varying ground motion and its mitigation using superelastic SMA restrainers
Publisher: Elsevier BV
Date: 06-2018
INELASTIC RESPONSES OF PILE-SOIL SYSTEM TO BLAST LOADS
Publisher: Elsevier BV
Date: 02-1994
Numerical derivation of homogenized dynamic masonry material properties with strain rate effects
Publisher: Elsevier BV
Date: 03-2009
Required separation distance between decks and at abutments of a bridge crossing a canyon site to avoid seismic pounding
Publisher: Wiley
Date: 2009
DOI: 10.1002/EQE.943
Characteristics of torsional ground motions
Publisher: Wiley
Date: 06-1996
DOI: 10.1002/(SICI)1096-9845(199606)25:6<599::AID-EQE571>3.0.CO;2-2
Vented gas explosion overpressure prediction of obstructed cubic chamber by Bayesian Regularization Artificial Neuron Network - Bauwens model
Publisher: Elsevier BV
Date: 11-2018
Responses of masonry infill walls retrofitted with CFRP, steel wire mesh and laminated bars to blast loadings
Publisher: SAGE Publications
Date: 06-2014
DOI: 10.1260/1369-4332.17.6.817
Abstract: Many materials are available for retrofitting masonry infill walls to resist explosion loads. Selection of the most suitable material is essential for optimal performance and cost. In this study, a series of trials were conducted in a specially designed test setup to determine and compare the performances of 1/2-scale masonry infill walls retrofitted with carbon fibre-reinforced polymer strips, steel wire mesh and laminated steel bars, respectively, as well as an unreinforced masonry wall, subjected to blast loads. High fidelity FE models with detail modelling of brick, mortar and retrofitting materials are also developed in LS-DYNA to simulate the blast tests. The accuracy of the FE models in predicting the field blast tests is verified with the test data. The calibrated FE models are used to perform intensive numerical simulations to investigate the effectiveness of various retrofitting measures. The displacement response, failure mode, level of damage and fragmentation from both the field blasting tests and numerical simulations are compared and used to assess the effectiveness of the retrofitting measures. The results demonstrate that the URM retrofitted with steel mesh performed the best among the three retrofitting measures in blast loading resistance, the wall retrofitted with closely spaced CFRP strips performed slightly better than that with steel bars.
Numerical investigation of effects of water saturation on blast wave propagation in soil mass
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2004
Integrated health monitoring for reinforced concrete beams: An experimental study
Publisher: Informa UK Limited
Date: 2011
Vibration-based damage detection of structures by genetic algorithm
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2002
Numerical investigation of the failure mechanism of cubic concrete specimens in SHPB tests
Publisher: Elsevier BV
Date: 2022
A full coupled numerical analysis approach for buried structures subjected to subsurface blast
Publisher: Elsevier BV
Date: 2005
Post-blast performance and residual capacity of CFDST columns subjected to contact explosions
Publisher: Elsevier BV
Date: 04-2020
Dynamic assessment of undersea pipeline bedding condition - art. no. 65321D
Publisher: SPIE
Date: 06-04-2007
DOI: 10.1117/12.714003
Experimental and numerical study of boundary and anchorage effect on laminated glass windows under blast loading
Publisher: Elsevier BV
Date: 05-2015
Domino-type progressive collapse analysis of a multi-span simply-supported bridge: A case study
Publisher: Elsevier BV
Date: 05-2015
Damage detection of shear connectors in bridge structures with transmissibility in frequency domain
Publisher: World Scientific Pub Co Pte Lt
Date: 05-01-2014
DOI: 10.1142/S0219455413500612
Abstract: Shear connectors are generally used to link the slab and girder together in slab-on-girder bridge structures. Damage of shear connectors in such structures will result in shear slippage between the slab and girder, which significantly reduces the load-carrying capacity of bridges. A damage detection approach based on transmissibility in frequency domain is proposed in this paper to identify the damage of shear connectors in slab-on-girder bridge structures with or without reference data from the undamaged structure. The transmissibility, which is an inherent system characteristic, indicates the relationship between two sets of response vectors in frequency domain. Measured input force and acceleration responses from hammer tests are analyzed to obtain the frequency response functions at the slab and girder sensor locations by the experimental modal analysis. The transmissibility matrix that relates the slab response to the girder response is then derived. By comparing the transmissibility vectors in undamaged and damaged states, the damage level of shear connectors can be identified. When the measurement data from the undamaged structure are not available, a study with only the measured response data in the damaged state for the condition assessment of shear connectors is also conducted. Numerical and experimental studies on damage detection of shear connectors linking a concrete slab to two steel girders are conducted to validate the accuracy and efficiency of the proposed approach. The results demonstrate that the proposed method can be used to identify shear connector damages accurately and efficiently. The proposed method is also applied to the condition evaluation of shear connectors in a real composite bridge with in-field testing data.
Estimation of failure probabilities of RC frame structures in Singapore to the simulated largest credible ground motion
Publisher: Elsevier BV
Date: 2004
Modified state-space procedure for pseudodynamic testing
Publisher: Wiley
Date: 2001
DOI: 10.1002/1096-9845(200101)30:1<59::AID-EQE996>3.0.CO;2-X
Experimental and numerical studies of the seismic behavior of a steel-concrete composite rigid-frame bridge subjected to the surface rupture at a thrust fault
Publisher: Elsevier BV
Date: 02-2020
Dynamic response and damage analysis of masonry structures and masonry infilled RC frames to blast ground motion
Publisher: Elsevier BV
Date: 02-2005
Seismic performance of precast concrete-filled circular tube segmental column under biaxial lateral cyclic loadings
Publisher: Springer Science and Business Media LLC
Date: 02-08-2019
Identification of Minor Structural Damage Based on Electromechanical Impedance Sensitivity and Sparse Regularization
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2018
Strain rate effect on interfacial bond behaviour between BFRP sheets and steel fibre reinforced concrete
Publisher: Elsevier BV
Date: 10-2019
Experimental investigation of ultra-high performance concrete slabs under contact explosions
Publisher: Elsevier BV
Date: 07-2016
Improved resistance functions for RC elements accounting for compressive and tensile membrane actions
Publisher: Elsevier BV
Date: 2022
Heave Motion Mitigation of Semi-Submersible Platform Using Inerter-Based Vibration Isolation System (IVIS)
Publisher: Elsevier BV
Date: 09-2020
Substructuring technique for damage detection using statistical multi-stage artificial neural network
Publisher: SAGE Publications
Date: 08-2010
DOI: 10.1260/1369-4332.13.4.619
Abstract: Artificial Neural networks (ANN) have been proven in many studies to be able to efficiently detect damage from vibration measurements. Their capability to recognize patterns and to handle non-linear and non-unique problems provides an advantage over traditional mathematical methods in correlating the vibration data to damage location and severity. However, one shortcoming of ANN is they require enormous computational effort and sometimes prohibitive time and computer memory for training a reliable ANN model, especially when structures with many degrees of freedom are involved. Therefore, in most cases, rather large elements are used in the structure model to reduce the degrees of freedom. This results in the structural vibration properties not being sensitive to small damage in a large element. As a result, direct application of ANN to detecting damage in a large civil engineering structures is not feasible. In this study, a multi-stage ANN incorporating a probability method is proposed to tackle this problem. Through this method, a structure is ided into several substructures, and each substructure is assessed independently. In each subsequent stage, only the damaged substructures are analyzed, and eventually the location and severity of small structural damage can be detected. This approach greatly reduces the computational time and the required computer memory. Moreover, a probabilistic method is also used to include the uncertainties in vibration frequencies and mode shapes in damage detection analysis. It is found that this method reduces the uncertainty effect in frequencies due to duplication error in the multi-stage ANN model and reduces the uncertainty effect in mode shapes due to the damage in other substructures. The developed approach is applied to detect damage in numerically simulated and laboratory tested concrete slab. The results demonstrate that the proposed method can detect small damage with a higher level of confidence, and the undamaged elements are less likely to be falsely detected.
Numerical study of open-top truncated pyramid folded structures with interconnected side walls against flatwise crushing
Publisher: Elsevier BV
Date: 11-2018
Fatigue reliability evaluation of deck-to-rib welded joints in OSD considering stochastic traffic load and welding residual stress
Publisher: Elsevier BV
Date: 06-2018
Numerical and theoretical study of concrete spall damage under blast loads
Publisher: Trans Tech Publications, Ltd.
Date: 05-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.553.774
Abstract: Spall damage is a typical failure mode of concrete structures under blast or high velocity impact loads. At the opposite side from which the structural element was impulsively loaded, spall will occur if the net primary stresses over an area exceed the dynamic tensile strength of concrete. Fragments of structural element could eject with large velocities, and this kind of damage can cause severe threats to equipment and personnel. In the present study, reinforced concrete columns subjected to the blast loading is investigated and the numerical study of concrete spall is conducted. The spall depth is recorded and compared with the theoretical results derived from wave propagation theory. The parameters that affect the concrete spall damage are investigated.
Influence of Asphalt Pavement Conditions on Fatigue Damage of Orthotropic Steel Decks: Parametric Analysis
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2018
Influence of micro basalt and recycled macro polypropylene hybrid fibre on physical and mechanical properties of recycled aggregate concrete
Publisher: Elsevier BV
Date: 10-2023
Structural damage identification with limited modal measurements and ultra-sparse Bayesian regression
Publisher: Hindawi Limited
Date: 08-04-2021
DOI: 10.1002/STC.2729
Seismic Performance of Steel-Concrete Composite Rigid-Frame Bridge: Shake Table Test and Numerical Simulation
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2020
Experimental and numerical study on the behaviour of CFDST columns subjected to close-in blast loading
Publisher: Elsevier BV
Date: 04-2019
Numerical Study of the Seismic Responses of Precast Segmental Column Bridge under Spatially Varying Ground Motions
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2018
On the effectiveness of ventilation to mitigate the damage of spherical membrane vessels subjected to internal detonations
Publisher: SAGE Publications
Date: 28-01-2020
Abstract: This article conducts a comparative study on the effectiveness of ventilation to mitigate blasting effects on spherical chambers subjected to internal detonations of high explosives through finite element analysis using the software package AUTODYN. Numerical simulations show that ventilation is ineffective in mitigating the damage of spherical chambers subjected to internal high explosives explosions because the chamber response is mainly described by high-frequency membrane modes. Openings do not reduce the chamber response despite they can reduce the blast overpressure after the chamber reaches its peak response. Worse still, openings lead to stress concentration, which weakens the structure. Therefore, small openings may reduce the capacity of the chamber to resist internal explosions. In addition, because large shock waves impose the chamber to respond to a reverberation frequency associated with the re-reflected shock wave pulses, secondary re-reflected shock waves can govern the chamber response, and plastic/elastic resonance can occur to the chamber. Simulations show that the time lag between the first and the second shock wave ranges from 3 to 7 times the arrival time of the first shock wave, implying that the current simplified design approach should be revised. The response of chambers subjected to eccentric detonations is also studied. Results show that due to asymmetric explosions, other membrane modes may govern the chamber response and causes localized damage, implying that ventilation is also ineffective to mitigate the damage of spherical chambers subjected to eccentric detonations.
Structural damage identification with uncertain modelling error and measurement noise by clustering based tree seeds algorithm
Publisher: Elsevier BV
Date: 04-2019
Analysis of imperfect column buckling under intermediate velocity impact
Publisher: Elsevier BV
Date: 09-2000
Machine learning prediction of BLEVE loading with graph neural networks
Publisher: Elsevier BV
Date: 2024
The response of glass window systems to blast loadings: An overview
Publisher: SAGE Publications
Date: 28-01-2016
Abstract: The failure of glass windows in terrorist bombing attacks and accidental explosion incidents has been cited as one of the major causes to the vast casualties. Many studies have been carried out to investigate the response and vulnerability of glass windows against blast loadings. These include laboratory and field tests that have been carried out to experimentally study glass window performance under explosion scenarios and development of analytical and numerical models to analyze and predict glass window responses. This article reviews literatures on the studies of the response of glass window systems to blast loadings. Over 100 papers and documents that are available in the open literature are reviewed. The background and history of the studies on the topic are also briefed. Understandings about the dynamic material properties of glass and available material models are summarized. Popularly used analysis methods and design standards for monolithic and laminated glass windows are outlined, and their accuracies are discussed. Recent studies including analytical solution, numerical simulation, and experimental investigations on glass window systems are summarized. Mitigation measures for blast-resistant windows are also briefly discussed.
Structural response of modular buildings - An overview
Publisher: Elsevier BV
Date: 03-2018
Identification of time-varying nonlinear structural physical parameters by integrated WMA and UKF/UKF-UI
Publisher: Springer Science and Business Media LLC
Date: 27-08-2021
Effect of crumb rubber on mechanical properties of multi-phase syntactic foams
Publisher: Elsevier BV
Date: 04-2018
Effects of steel confinement and shear keys on the impact responses of precast concrete segmental columns
Publisher: Elsevier BV
Date: 07-2019
Crushing performances of Kirigami modified honeycomb structure in three axial directions
Publisher: Elsevier BV
Date: 03-2021
Experimental and analytical study of flexural behaviour of BFRP sheets strengthened RC beams with new epoxy anchors
Publisher: Elsevier BV
Date: 08-2021
Assessment of structure damage to blasting induced ground motions
Publisher: Elsevier BV
Date: 10-2000
Using vibration phase space topology changes for structural damage detection
Publisher: SAGE Publications
Date: 31-05-2012
Abstract: Ideally, structural health monitoring of civil infrastructure consists of determining, by measured parameters, the location and severity of damage in the structure. Many structural vibration parameters have been used to identify and quantify damage. Using parameters based on structural vibration phase space features for damage detection is a new field in structural health monitoring. In this article, a new parameter based on topology changes of the phase space of vibration signals is proposed to identify structural damage, and an index named changes of phase space topology derived from vibration time history is used to locate the damage. A circular arch structure is used to demonstrate the method. Both numerical simulation and experimental tests of dynamic responses of a scaled arch structure to impact loads are carried out. The obtained structural response data are used to detect structural damage. Both the experimental and numerical results indicate that this method can successfully locate damage. It also demonstrated that this proposed method is more sensitive to damage but less sensitive to noise than modal-based parameters. The proposed damage index can be a good candidate in an online structural health monitoring system, as it depends on global vibration measurements but is more sensitive to structural damage than other global vibration-based parameters such as vibration frequencies and mode shapes.
Effect of aggregate size on the dynamic interfacial bond behaviour between basalt fiber reinforced polymer sheets and concrete
Publisher: Elsevier BV
Date: 12-2019
Experimental and numerical study of the slip factor for G350-steel bolted connections
Publisher: Elsevier BV
Date: 07-2019
Enhanced vibration decomposition method based on multisynchrosqueezing transform and analytical mode decomposition
Publisher: Hindawi Limited
Date: 16-03-2021
DOI: 10.1002/STC.2730
The blast resistant performance of concrete-filled steel-tube segmental columns
Publisher: Elsevier BV
Date: 05-2020
Using deep learning technique for non-model based vibration response reconstruction
Publisher: CRC Press
Date: 19-04-2021
Distinctive and fuzzy failure probability analysis of an anisotropic rock mass to explosion load
Publisher: Wiley
Date: 2003
DOI: 10.1002/NME.588
Structural damage detection based on swarm intelligence technique and hybrid objective function
Publisher: CRC Press
Date: 19-04-2021
Energy absorption characteristics of bio-inspired hierarchical multi-cell square tubes under axial crushing
Publisher: Elsevier BV
Date: 07-2021
Experimental study of dynamic material properties of clay brick and mortar at different strain rates
Publisher: Informa UK Limited
Date: 2008
Calculation of BLEVE energy and overpressures inside a tunnel using analytical and CFD methods
Publisher: Elsevier BV
Date: 02-2022
Near real-time bolt-loosening detection using mask and region-based convolutional neural network
Publisher: Hindawi Limited
Date: 13-04-2021
DOI: 10.1002/STC.2741
Seismic response analysis of transmission tower-line system on a heterogeneous site to multi-component spatial ground motions
Publisher: SAGE Publications
Date: 06-2011
DOI: 10.1260/1369-4332.14.3.457
Abstract: This paper studies the nonlinear responses of a coupled transmission towerline system on a heterogeneous site subjected to multi-component spatially varying ground motions. The three-dimensional finite element model of the transmission tower-line system is established with consideration of the geometric nonlinearity of the transmission lines. The spatial variation of ground motions associated with the wave passage, coherency loss and local site effects are considered. The spatial ground motions on ground surface are derived by modelling the base rock motion propagating through the local soil sites. The base rock motions are assumed consisting of out-of-plane and in-plane waves and are simulated stochastically based on an empirical coherency loss function and the filtered Tajimi-Kanai power spectral density function. The effects of multi-component, spatial variations of ground motions and varying site conditions at multiple tower foundations on seismic response of the transmission tower-line system are analysed. The study reveals that for a reliable seismic response analysis and safe and economic seismic resistance design of transmission tower-line systems, the multi-support and multi-component earthquake excitations with consideration of the effects of local site conditions on ground motion spatial variations should be considered.
Seismic behaviors of PCIC piers-supported bridge structures to spatially varying ground motions
Publisher: Elsevier BV
Date: 2023
Numerical study on bending response of precast segmental concrete beams externally prestressed with FRP tendons
Publisher: Elsevier BV
Date: 08-2021
Response of a RC bridge in WA to simulated spatially varying seismic ground motions
Publisher: Informa UK Limited
Date: 2008
Numerical simulations of the performance of steel guardrails under vehicle impact
Publisher: Springer Science and Business Media LLC
Date: 10-2008
Post-cracking behaviour of basalt and macro polypropylene hybrid fibre reinforced concrete with different compressive strengths
Publisher: Elsevier BV
Date: 11-2020
Control of wave-induced vibrations on floating production systems
Publisher: Elsevier BV
Date: 09-2017
Time-varying system identification by enhanced Empirical Wavelet Transform based on Synchroextracting Transform
Publisher: Elsevier BV
Date: 10-2019
Prediction of blast-induced window glass fragments
Publisher: CRC Press
Date: 18-11-2011
DOI: 10.1201/B10571-115
A simplified numerical method for blast induced structural response analysis
Publisher: SAGE Publications
Date: 09-2014
DOI: 10.1260/2041-4196.5.3.323
Abstract: Efficiently and accurately predicting structural dynamic response and damage to external blast loading is a big challenge to both structural engineers and researchers. The conventional numerical treatment to this problem is proved being able to give reliable predictions, however at the cost of enormous computational time and resource. Simplified SDOF approach is popularly used in design as it is straightforward to use and also gives good structural response predictions if the response is governed by a global response mode (shear or bending) and the accurate dynamic deflection curve is available, but it cannot predict the detailed local structural damage. In this study, a new numerical approach that combines the recently proposed two-step method and the static condensation method is proposed to analyze structure response and collapse to blast loads. The two-step method ides the structural response into two phases, i.e. forced vibration phase (blast loading duration) and free vibration phase. Single- Degree-of-Freedom system approach is adopted to solve the structural element responses at the end of the forced vibration phase, and the structural free vibration simulation is carried out using the hydro-code LS-DYNA to calculate the detailed structural response and damage. The static condensation technique is utilized to condense structural components that are relatively away from the explosion center to further reduce the computational effort. To demonstrate the proposed method, the structural responses of a three story RC frame to blast loads are calculated by four approaches, i.e. the traditional detailed FE simulation, the two-step method, the model condensation method, and the new combined two-step and dynamic condensation method. Through the results comparison, the efficiency and accuracy of the proposed combined approach are demonstrated.
Limit angular velocity of rotating disc with unified yield criterion
Publisher: Elsevier BV
Date: 05-2001
Inerter-based structural vibration control: A state-of-the-art review
Publisher: Elsevier BV
Date: 09-2021
Identifying workers' safety behavior-related personality by sensing
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2020
Numerical studies on the seismic responses of bridge structures with precast segmental columns
Publisher: Elsevier BV
Date: 11-2017
Stress Wave Mitigation Properties of Dual-meta Panels against Blast Loads
Publisher: Elsevier BV
Date: 08-2021
Internal and external pressure prediction of vented gas explosion in large rooms by using analytical and CFD methods
Publisher: Elsevier BV
Date: 09-2017
Passive vibration control of cylindrical offshore components using pipe-in-pipe (PIP) concept: An analytical study
Publisher: Elsevier BV
Date: 09-2017
Performance of foam-filled kirigami corrugated sandwich panels as sacrificial cladding against blast loads
Publisher: Elsevier BV
Date: 10-2023
Effect of inter-module connection stiffness on structural response of a modular steel building subjected to wind and earthquake load
Publisher: Elsevier BV
Date: 06-2020
A novel rotational inertia damper for heave motion suppression of semisubmersible platform in the shallow sea
Publisher: Hindawi Limited
Date: 15-05-2019
DOI: 10.1002/STC.2368
Seismic fragility assessment of the Daikai subway station in layered soil
Publisher: Elsevier BV
Date: 05-2020
Numerical derivation of pressure-impulse diagrams for prediction of RC column damage to blast loads
Publisher: Elsevier BV
Date: 11-2008
Experimental and numerical study of basalt fiber reinforced polymer strip strengthened autoclaved aerated concrete masonry walls under vented gas explosions
Publisher: Elsevier BV
Date: 12-2017
Shear behaviour of ambient cured geopolymer concrete beams reinforced with BFRP bars under static and impact loads
Publisher: Elsevier BV
Date: 03-2021
Response of a transmission tower-line system at a canyon site to spatially varying ground motions
Publisher: Zhejiang University Press
Date: 02-2011
A Mechanism of Hot-spots Formation at the Crack Tip of Al-PTFE under Quasi-static Compression
Publisher: Wiley
Date: 03-11-2017
Improved analysis method for structural members subjected to blast loads considering strain hardening and softening effects
Publisher: SAGE Publications
Date: 12-04-2021
DOI: 10.1177/13694332211007382
Abstract: In analysis and design of structures subjected to blast loading, equivalent Single-Degree-of-Freedom (SDOF) method is commonly recommended in design guides. In this paper, improved analysis method based on SDOF models is proposed. Both flexural and direct shear behaviors of structures subjected to blast load are studied using equivalent SDOF systems. Methods of deriving flexural and direct shear resistance functions are introduced, of which strain hardening and softening effects are considered. To collocate with the improved SDOF models, the improved design charts accounting for strain hardening and softening are developed through systematical analysis of SDOF systems. To demonstrate the effectiveness of the proposed analysis method, a model validation is made through comparing the predictions with laboratory shock tube testing results on reinforced concrete (RC) columns. It is found that compared to the conventional approach with elastic and elastic-perfectly-plastic model, the elastic-plastic-hardening model provides more accurate predictions. Additional non-dimensional design charts considering various levels of elastic-plastic-hardening/softening resistance functions are developed to supplement those available in the design guides with elastic-perfectly-plastic resistance function only, which provide engineers with options to choose more appropriate resistance functions in design analysis.
A Rights-Based Approach for Service Providers to Measure the Quality of Life of Children with a Disability
Publisher: Elsevier BV
Date: 12-2018
DOI: 10.1016/J.JVAL.2018.05.009
Abstract: This paper identifies the best instruments for service providers to measure the quality of life (QoL) of children with a disability, with a focus on their alignment with the Convention on the Rights of Persons with a Disability (CRPD). This study reviewed systematic reviews to identify generic QoL instruments for children and adolescents, followed by an appraisal process using newly developed criteria. QoL instruments with a health status, functioning, and condition-specific focus were excluded. Twenty generic QoL instruments for children were identified from existing systematic reviews to undergo further review. Only 2 of the 20 instruments were recommended for service providers to measure the QoL of children with a disability (KIDSCREEN and KINDL). Many pediatric QoL instruments (N = 9) focus on functioning and are not consistent with the CRPD, confounding a child's functioning with their feelings about their life. KIDSCREEN and KINDL have self-report and parent report versions, are applicable for childhood and adolescence, demonstrate adequate reliability and validity, involved children in their development, focus on wellbeing, are likely to be able to be completed by a child with a disability, and are low in cost. Many instruments focus on functioning rather than wellbeing and thus may not capture the QoL of children with a disability. A child's functional limitations may not be consistent with their feelings about life. Two instruments that assess wellbeing and meet the criteria important for service providers now require further testing to explore their usefulness and validity for children with varying abilities.
Confidence-based quantitative risk analysis for offshore accidental hydrocarbon release events
Publisher: Elsevier BV
Date: 05-2015
Numerical research on seismic response characteristics of shallow buried rectangular underground structure
Publisher: Elsevier BV
Date: 2019
Flexural behaviour of precast segmental concrete beams internally prestressed with unbonded CFRP tendons under four-point loading
Publisher: Elsevier BV
Date: 08-2018
Damage Assessment of Segmental Concrete Beams with Different Types of Joints and Prestressed External Tendons
Publisher: World Scientific Pub Co Pte Ltd
Date: 14-09-2023
Development of double-helix macro BFRP fibers for concrete reinforcement
Publisher: Springer Science and Business Media LLC
Date: 08-2021
Densely connected convolutional networks for vibration based structural damage identification
Publisher: Elsevier BV
Date: 10-2021
Vortex-induced vibration of a full-diamond textured cylinder at subcritical Reynolds numbers
Publisher: Elsevier BV
Date: 05-2022
Damage Assessment of Two-Way RC Slab Subjected to Blast Load Using Mode Approximation Approach
Publisher: World Scientific Pub Co Pte Lt
Date: 2017
DOI: 10.1142/S0219455417500134
Abstract: Significant research efforts have been invested on studying the response and damage of structures subjected to blast loads for better life and property protections. The single-degree-of-freedom (SDOF) approach has been widely adopted to simplify the structural response analysis for engineering design purpose. However, such an approach under certain circumstances oversimplifies the structural behavior and might not give reliable predictions of structural responses to blast loads. On the other hand, although detailed high fidelity finite element (FE) approach is able to give relatively accurate predictions of structural response, it is unfortunately not straightforward for application and very time-consuming, which impedes its application among engineers. Therefore, a method that can assure not only reliability but also efficiency is highly needed for design practice. In the present study, mode approximation method with Pressure–Impulse (P-I) diagrams is applied to analyze response and damage of RC slab due to blast load. Slab under analysis is assumed rigid-plastic and simply supported. Shear failure, bending failure and combined failure modes are considered based on different failure modes. Critical equations for structural shear and bending failures are derived respectively with appropriate failure criteria. P–I diagrams are then developed for quick damage assessments. The analytical results are verified by comparing with high fidelity numerical simulations. The reliability and efficiency of using this approach for design and analyzing RC slab response under blast loads are demonstrated.
Mesoscale modelling of concrete reinforced with spiral steel fibres under dynamic splitting tension
Publisher: SAGE Publications
Date: 10-10-2018
Abstract: The addition of discrete steel fibres into concrete has been widely recognised as an effective measure to enhance the ductility, post-cracking resistance and energy absorption of the matrix subjected to impact loads. Despite useful information from experimental studies that investigate the macro-scale performance of steel fibre–reinforced concrete under dynamically applied loadings, results from a series of tests or from tests by different researchers are often found to be scattered. Besides variations in testing conditions, random variations of size, location and orientation of aggregates and fibres in steel fibre–reinforced concrete are deemed the fundamental reason of the scattering test data. High-fidelity modelling of concrete and steel fibre–reinforced concrete in mesoscale has been widely adopted to understand the influence of each component in the composite material. Numerical studies have been published to discuss the behaviour of steel fibre–reinforced concrete under dynamic splitting tension. Different shapes, for ex le, circles, ovals and polygons, of coarse aggregates were considered in different studies, and different conclusions were drawn. This study investigates the influence of the shape of aggregates on numerical prediction in mesoscale modelling of steel fibre–reinforced concrete materials with spiral fibres under dynamic splitting tension in terms of the strain distribution, cracking pattern and strength. The numerical model is validated by experimental results. It is found that the shape of aggregates in mesoscale modelling of splitting tensile tests has negligible influence. Furthermore, steel fibre–reinforced concrete specimens with different volume fractions of spiral fibres from 0.5% to 3.0% under various loading rates are simulated. Results from parametric simulations indicate the optimal dosage of spiral fibres in steel fibre–reinforced concrete mix with respect to the construction cost and mechanical property control.
Impact responses of precast hollow reinforced concrete beams with prestress tendons using high-fidelity physics-based simulations
Publisher: Elsevier BV
Date: 2022
Using polynomial chaos expansion for uncertainty and sensitivity analysis of bridge structures
Publisher: Elsevier BV
Date: 03-2019
Dynamic Analysis of Nonclassically Damped Systems with Linear Behavior Using Load-Dependent Ritz Vectors
Publisher: World Scientific Pub Co Pte Ltd
Date: 03-2019
DOI: 10.1142/S0219455419500226
Abstract: In the present paper, a practical superposition method is proposed for complex load-dependent Ritz (CLDR) vectors for use in the dynamic analysis of nonclassically d ed systems. In particular, an algorithm for CLDR vector generation is developed and the CLDR vectors are calculated in the physical space, instead of the state space, to reduce the computational effort and storage space, while improving the stability of the algorithm. Moreover, single CLDR vector (i.e. using only one starting vector) and block CLDR vector (i.e. using multi-starting vectors) generation procedures are introduced for the uni and multidirectional loading patterns respectively, and the latter is applied to the system with repeated natural frequencies. In addition, a criterion, which is based on the spatial load distribution, is proposed to determine a proper number of the CLDR vectors prior to their use in the dynamic analysis. Two numerical ex les are provided to illustrate the accuracy and efficiency of the proposed method. Also, the performance of the cut-off criterion is presented and 10% error or less in the participation loading distribution is recommended for practical applications.
Volumetric Properties of Concrete under True Triaxial Dynamic Compressive Loadings
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2019
Numerical study of a new multi-arch double-layered blast-resistance door panel
Publisher: Elsevier BV
Date: 05-2012
Dynamic crushing and energy absorption of foam filled multi-layer folded structures: Experimental and numerical study
Publisher: Elsevier BV
Date: 11-2019
Numerical study of concrete spall damage to blast loads
Publisher: Elsevier BV
Date: 06-2014
Experimental study on dynamic mechanical properties of fly ash and slag based alkali-activated concrete
Publisher: Elsevier BV
Date: 2023
Single and double-layered kirigami corrugated sandwich panels against impact loads
Publisher: Elsevier BV
Date: 05-2023
Source identification of microseismic events in underground mines with interferometric imaging and cross wavelet transform
Publisher: Elsevier BV
Date: 2018
Damping properties and dynamic responses of metaconcrete beam structures subjected to transverse loading
Publisher: Elsevier BV
Date: 12-2021
Propagation characteristics of blast-induced shock waves in a jointed rock mass
Publisher: Elsevier BV
Date: 08-1998
Numerical prediction of blast fragmentation of reinforced concrete slab using ALE-FEM-SPH coupling method
Publisher: Elsevier BV
Date: 08-2023
Experimental methods for inter-module joints in modular building structures - A state-of-the-art review
Publisher: Elsevier BV
Date: 04-2022
Numerical simulation of medium to large scale BLEVE and the prediction of BLEVE's blast wave in obstructed environment
Publisher: Elsevier BV
Date: 2021
Numerical studies on the blast-resistant capacity of stiffened multiple-arch panel
Publisher: Trans Tech Publications, Ltd.
Date: 2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.535-536.514
Abstract: Blast-resistant structures are traditionally designed and fabricated with solid materials of heavy weight to resist blast loadings. This not only increases the material and construction costs, but also undermines the operational performance of protective structures. To overcome these problems, new designs with either new structural forms or new materials are demanded against blast loads. A multi-arch double-layered unstiffened panel has been proposed as a new structural form in the previous study[1]. Its performance has been numerically demonstrated better than other forms of double-layered panels in resisting blast loads. In this study, to further improve the effectiveness of the multi-arch double-layered panel in resisting blast loads, responses of a five-arch double-layered panel with rectangular stiffeners to blast loads are investigated by using finite element code Ls-Dyna. Peak displacement, internal energy absorption, boundary reaction forces and plastic strain are extracted and used as response parameters to demonstrate the effectiveness of stiffened panel on the blast resistance capacities. The numerical results show that the stiffened panel outperforms the unstiffened panel of the same weight on the blast-resistant capacity. The stiffened multi-arch double-layered panel has great potential applications in the blast-resistant panel design.
Effects of a Single Open Joint on Energy Transmission Coefficients of Stress Waves with Different Waveforms
Publisher: Springer Science and Business Media LLC
Date: 20-11-2015
Numerical modelling of masonry wall response to blast loads
Publisher: Informa UK Limited
Date: 2009
Numerical evaluation of the influence of aggregates on concrete compressive strength at high strain rate
Publisher: SAGE Publications
Date: 06-2011
DOI: 10.1260/2041-4196.2.2.177
Abstract: The dynamic strength of concrete materials is usually obtained by conducting laboratory tests such as drop-weight test or split Hopkinson pressure bar (SHPB) test. It is widely accepted that the uniaxial compressive strength of concrete and concrete-like material increases with strain rate. Many empirical relations of concrete material dynamic increase factor (DIF), which are proposed for use in the design and analysis, are given in the literature. However, most of these empirical relations were obtained from testing data of concrete-like materials, i.e. the testing specimens were made of mortar matrix only without coarse aggregates owing to constraints in preparing the concrete specimens for high-speed impact tests. Because concrete is a composite material with mortar matrix, interfacial transition zone (ITZ) and aggregates, and these components have different material properties, using specimens made of mortar material alone in tests may not give accurate concrete dynamic material properties. It is also known that the lateral inertia confinement affects the dynamic strength of concrete specimens obtained in impact tests. A number of studies to investigate and quantify the lateral inertia confinement effect on dynamic strength of concrete materials obtained in impact tests have been published. Previous studies also indicate that including aggregates in concrete specimens affects the dynamic strength. However, no systematic study that devotes to investigating the influence of aggregates in concrete specimen on its dynamic strength has been reported yet. In the present study, a mesoscale concrete material model is used to simulate impact tests and to study the influences of aggregates on concrete material compressive strength increment at high strain rates. The commercial software AUTODYN is used to perform the numerical simulations. A method to remove the influence from lateral inertia confinement is proposed and verified. The influence of ITZ on compressive behavior of concrete specimen is discussed. Numerical simulations of concrete specimens with different volumetric percentages, e.g. 20% 30% and 40%, of aggregates under impact loads of different loading rates are carried out. The influence of the aggregates on DIF of concrete material is examined and quantified.
Operational modal identification of structures based on improved empirical wavelet transform
Publisher: Hindawi Limited
Date: 18-01-2019
DOI: 10.1002/STC.2323
Plastic hinges and inertia forces in RC beams under impact loads
Publisher: Elsevier BV
Date: 05-2017
Numerical evaluation of energy absorption in ship-offshore fixed platform collisions
Publisher: American Society of Mechanical Engineers
Date: 08-06-2014
Abstract: Both the maritime traffic and the number of built offshore platforms have been continuously increasing over recent times. Among the structures built offshore, the fixed type constitutes the majority. The consequent ersity of plausible collision scenarios involving offshore platforms and passing ships must therefore consider aspects such as different ship size, different impact energy or different impact locations. For high energy collisions, large deformations are expected on both the platform and ship structures. It is expected that part of the energy absorption in the platform is confined to localized zones where plastic deformations take place, although the elastic strain energy may also be significant. For such impact problems, the amounts of strain energy in each structure are mainly dependent on the relative stiffness of the structures. By taking different ship and platform configurations as well as different contact points between the two bodies, different relative stiffness of the two structures can be tested in order to provide a clearer understanding of the dissipation of strain energy. The possible plastic deformation mechanisms are analyzed and simplified approaches are considered for prediction in comparison with the numerical results carried out by finite element analysis. Based on the results, some evaluations are made with respect to the code of practice in offshore platform design against ship impact.
The use of a non-probabilistic artificial neural network to consider uncertainties in vibration-based-damage detection
Publisher: Elsevier BV
Date: 2017
Comparison study of coupling effects of explosive charge on ground vibrations
Publisher: Informa UK Limited
Date: 1998
Study on components match of solar-ground source heat pump and heating network complementary heating system in severe cold region
Publisher: Springer Berlin Heidelberg
Date: 24-09-2014
Dynamic assessment of shear connectors in slab-girder bridges
Publisher: Elsevier BV
Date: 07-2007
Bridge condition assessment under moving loads using multi-sensor measurements and vibration phase technology
Publisher: Springer International Publishing
Date: 04-10-2017
Experimental and numerical study on CFRP strip strengthened clay brick masonry walls subjected to vented gas explosions
Publisher: Elsevier BV
Date: 07-2019
Study of SSI and non-uniform ground motion effect on pounding between bridge girders
Publisher: Elsevier BV
Date: 08-2005
Behavior of fiber-reinforced polymer-strengthened reinforced concrete beams under static and impact loads
Publisher: SAGE Publications
Date: 31-07-2017
Abstract: This study investigates the behavior of fiber-reinforced polymer-strengthened reinforced concrete beams under static and impact loads. The experimental program includes six beams tested in static loads and seven beams tested against impact loads. Longitudinal fiber-reinforced polymer strips and fiber-reinforced polymer U-wraps were used to strengthen these beams. The section of four beams was modified to have a curved soffit in order to reduce the stress concentration of fiber-reinforced polymer U-wraps and provide confinement effect on longitudinal fiber-reinforced polymer strips. The experimental results showed that the proposed modification significantly increased the beam capacities as compared to their rectangular counterparts strengthened with the same amount of fiber-reinforced polymer material. In addition, this article also provides explanations and discussions on the phenomenon of shifting of the flexure failure mode under static loads to the shear–flexure failure mode under impact loads of all the beams tested in the study, as well as the proper interpretations of the measured impact forces in the tests. From the experimental results, it is recommended that the impact force and inertial force at the very early stage of an impact event should be used to design the impact resistance.
Effect of the plastic hinge and boundary conditions on the impact behavior of reinforced concrete beams
Publisher: Elsevier BV
Date: 04-2017
On the effectiveness of ventilation to mitigate the damage of spherical chambers subjected to confined trinitrotoluene detonations
Publisher: SAGE Publications
Date: 16-08-2019
Abstract: This article presents a comparative study on the effectiveness of ventilation to mitigate blasting effects on chambers subjected to confined detonations of high explosives. The pressure time-history that acts on the chamber walls is described by three components: (1) the first shock wave, (2) the train of re-reflected shock waves, and (3) the gas pressure. The radial response of spherical chambers is described by the radial breathing mode and modeled by an equivalent single degree of freedom system. The three pressure components are considered for the calculation of the maximum ductility ratio, which is obtained from the numerical solution of the single degree of freedom chamber response. It is assumed that openings reduce the gas pressure but they have an insignificant effect on shock waves. The dynamic response of fully and partially confined chambers are calculated and compared. Results show that intermediate/small openings (less than 10% of the surface of the chamber) are ineffective to mitigate the chamber response and damage. The vibratory response of the chamber is susceptible to elastic or plastic resonance but it is not considerably modified by the long-term gas pressure because of its high radial breathing mode frequency, allowing concluding that ventilation is ineffective to reduce the maximum response of spherical chambers subjected to internal high explosive explosion.
Modelling damage potential of high-frequency ground motions
Publisher: Wiley
Date: 2003
DOI: 10.1002/EQE.282
Theoretical modeling and numerical simulation of seismic motions at seafloor
Publisher: Elsevier BV
Date: 10-2015
Numerical Analysis of a Two-Rail Steel RHS Traffic Barrier to Vehicle Impact
Publisher: Informa UK Limited
Date: 2005
Significance of SSI and non-uniform near-fault ground motions in bridge response II: Effect on response with modular expansion joint
Publisher: Elsevier BV
Date: 2008
Influence of Ground Motion Duration on Responses of Concrete Gravity Dams
Publisher: Informa UK Limited
Date: 29-03-2018
Effect of Stress Path on the Damage Properties of Concrete under High Pressure
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2022
Parametric study of seismic performance of super-elastic shape memory alloy-reinforced bridge piers
Publisher: Informa UK Limited
Date: 09-2016
Simplified multiple equations' inverse problem of vented vessels subjected to internal gas explosions
Publisher: Elsevier BV
Date: 05-2015
Impact response of fibre reinforced geopolymer concrete beams with BFRP bars and stirrups
Publisher: Elsevier BV
Date: 03-2021
Using pipe-in-pipe systems for subsea pipeline vibration control
Publisher: Elsevier BV
Date: 02-2016
Numerical simulation of structural response and damage to simultaneous ground shock and airblast loads
Publisher: Elsevier BV
Date: 03-2007
Steel fibre reinforced alkali-activated geopolymer concrete slabs subjected to natural gas explosion in buried utility tunnel
Publisher: Elsevier BV
Date: 06-2020
Seismic fragility analyses of sea-crossing cable-stayed bridges subjected to multi-support ground motions on offshore sites
Publisher: Elsevier BV
Date: 06-2018
Numerical study of structural progressive collapse using substructure technique
Publisher: Elsevier BV
Date: 07-2013
Strain ratio effects on low-cycle fatigue behavior and deformation microstructure of 2124-T851 aluminum alloy
Publisher: Elsevier BV
Date: 05-2014
Prestress Force Monitoring and Quantification of Precast Segmental Beams through Neutral Axis Location Identification
Publisher: MDPI AG
Date: 07-03-2022
DOI: 10.3390/APP12052756
Abstract: This paper proposes using neutral axis locations to monitor and quantify the prestress force in post-tensioned precast segmental beams. Strain measurements are used to obtain the neutral axis locations of specific cross-sections of the precast prestressed segmental beams, based on the plane–remains–plane and linear strain distribution assumption. A theoretical calculation method based on the static equilibrium of a specific cross-section is developed to calculate the prestress force in segmental beams based on the neutral axis location. To verify the accuracy of the proposed method, a post-tensioned prestressed segmental beam is built and tested in the laboratory. A corresponding high-fidelity finite element model is also developed based on the beam design and material properties. Experimental studies and numerical simulations are conducted to verify the feasibility and accuracy of the proposed method in quantifying the prestress force in precast segmental beams. Both experimental and numerical results demonstrate that the proposed method can reliably estimate the prestress force, which can be used to monitor the prestress force loss in post-tensioned structures.
Seismic response analyses and performance assessment of masonry-infilled reinforced concrete frame buildings in Bhutan without and with soft storey
Publisher: SAGE Publications
Date: 26-07-2017
Abstract: Bhutan locates in a high seismicity region but has no seismic design code of its own. Recent devastating earthquake in Nepal, which is located in the same region as Bhutan and with similar construction types, raises the concern on the seismic safety of building structures in Bhutan. This study is aimed at assessing the performance of masonry-infilled and soft storey reinforced concrete frame buildings in Bhutan under the 475- and 2475-year return period ground motions predicted from the Probabilistic Seismic Hazard Analysis. A nonlinear strut model is used to model the infill wall, and the influence of openings and soil–structure interaction are considered in the analyses. The result suggests that the masonry-infilled reinforced concrete frame buildings in Bhutan could suffer repairable and irreparable damages under the 475-year return period ground motions and severe damages and even collapse under the 2475-year return period ground motion. The buildings with the soft storey are found to be more vulnerable than the normal masonry-infilled reinforced concrete buildings. The design recommendation of Indian Seismic Code improves the performance of soft storey buildings but cannot fully negate the soft storey effect. This study is the first such effort in assessing the performance of general building stocks in the high seismicity Bhutan. The results can guide the seismic strengthening options and can be used for further loss predictions for seismic preparedness of the country.
Prediction of BLEVE loads on structures using machine learning and CFD
Publisher: Elsevier BV
Date: 03-2023
Numerical and experimental study of steel wire mesh and basalt fibre mesh strengthened structural insulated panel against projectile impact
Publisher: SAGE Publications
Date: 11-10-2018
Abstract: Extreme wind events caused damages and losses around the world every year. Windborne debris impact might create opening on building envelop, which would lead to the increase in internal pressure and result in roof being lift up and wall collapse. Some standards including Australia Wind Loading Code (AS/NZS 1170:2:2011, 2011) put forward design criteria to protect structures against windborne debris impacts. Structural insulated panel with Oriented Strand Board skin and expanded polystyrene core has been increasingly used in the building industry. Its capacity was found insufficient to resist the windborne debris impact in cyclonic areas defined in the Australian Wind Loading Code. Therefore, such panels need be strengthened for their applications in construction in cyclonic areas. In this study, impact resistance capacities of seven structural insulated panels strengthened with steel wire mesh and basalt fibre mesh were experimentally and numerically investigated. The impact resistance capacities were identified by comparing the damage mode, residual velocity and unpenetrated length of projectile after impact. Experimental results clearly demonstrated the enhancement of the impact resistance capacities of panels strengthened with steel wire mesh and basalt fibre mesh. Finite element model was developed in LS-DYNA to simulate the dynamic response of the structural insulated panels under windborne debris impact. The accuracy of the numerical model was validated with the testing data.
Experimental investigation of the response of precast segmental columns subjected to impact loading
Publisher: Elsevier BV
Date: 09-2016
Numerical prediction of concrete slab response to blast loading
Publisher: Elsevier BV
Date: 10-2008
Vibration-based structural health monitoring of offshore pipelines: Numerical and experimental study
Publisher: Hindawi Limited
Date: 03-04-2013
DOI: 10.1002/STC.1494
Dynamic tensile properties of geopolymer concrete and fibre reinforced geopolymer concrete
Publisher: Elsevier BV
Date: 08-2023
Numerical analysis of lateral inertial confinement effects on impact test of concrete compressive material properties
Publisher: SAGE Publications
Date: 03-2010
DOI: 10.1260/2041-4196.1.1.145
Abstract: Dynamic material properties, in particular the dynamic strength, of concrete material are usually obtained by conducting laboratory tests such as drop-weight test and Split Hopkinson Pressure Bar (SHPB) test. It is commonly agreed that a few parameters associated with stress wave propagation will affect the test results, including the lateral and axial inertial effect, end friction confinement and stress wave reflection and refraction. Many different measures have been proposed to eliminate or limit the influences of these effects in dynamic tests of material properties. However, owing to the nature of dynamic loadings, especially those with high loading rates, it is very unlikely to completely eliminate these influences in physical testing. Moreover, it is also very difficult to quantify these influences from the laboratory testing data. In the present study, a refined mesoscale concrete material model is developed to simulate impact tests and to study the influences of lateral inertial confinement on concrete compressive strength increment at high strain rate. The commercial software AUTODYN is used to perform the numerical simulations. Numerical simulations of concrete specimens of different dimensions and under impact loads of different loading rates are carried out. The results are compared with those obtained from laboratory tests, with those specified in the code and simulated with homogeneous concrete material model. The reliability of the numerical simulation of impact tests is verified. It is found that the influences of lateral inertial confinement effect on Dynamic Increase Factor (DIF) is strain rate and specimen size dependent. Neglecting aggregates in concrete specimen in laboratory tests and numerical simulations lead to underestimation of DIF of concrete material.
Numerical simulation of blast wave interaction with structure columns
Publisher: Springer Science and Business Media LLC
Date: 08-2007
Mechanical properties and energy absorption of bio-inspired hierarchical circular honeycomb
Publisher: Elsevier BV
Date: 05-2022
Performance of structural insulated panels with rigid skins subjected to windborne debris impacts - Experimental investigations
Publisher: Elsevier BV
Date: 02-2015
Numerical Analysis of FRP-Composite-Strengthened RC Panels with Anchorages against Blast Loads
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2011
Analytical mod eling of traffic-induced ground vibrations
Publisher: American Society of Civil Engineers (ASCE)
Date: 08-1998
Data driven structural dynamic response reconstruction using segment based generative adversarial networks
Publisher: Elsevier BV
Date: 05-2021
Dynamic compressive properties of lightweight rubberized geopolymer concrete
Publisher: Elsevier BV
Date: 12-2020
The effect of concrete shear key on the performance of segmental columns subjected to impact loading
Publisher: SAGE Publications
Date: 28-07-2017
Abstract: Conventional precast segmental columns with seismic resistance design consist of only flat concrete segments with prestress tendon. This is because friction between adjacent segments is sufficient to resist the lateral forces from earthquake-induced actions. However, the friction between segments is not necessarily sufficient to resist lateral impact loads such as vehicle impact the column might experience during its service life. This article investigates the effectiveness of using concrete shear key in segments of precast segmental column in resisting the lateral impact loading. The precast reinforced concrete segments were designed with concrete shear keys to improve the column shear resistance capacity and minimize the relative displacement between adjacent segments. Two groups of segmental columns with and without shear key were designed and tested using a pendulum impact system. The effectiveness of shear key in resisting lateral impact loads was analysed by comparing the performance of the two groups of segmental columns. The testing results revealed that by introducing concrete shear key to segmental column, the relative displacement between adjacent segments could be effectively reduced. However, the large concrete shear key increased stress concentration in the concrete segments. Relatively, more severe damages to concrete segments were found on the columns with shear key. Further improvements on shear key designs should be made for better performance of segmental columns against impact loading.
Structural Damage Detection with Uncertainties Using a Modified Tree Seeds Algorithm
Publisher: Springer International Publishing
Date: 17-11-2019
Analysis of ultrasonic nonlinearity for bolt hole crack detection in rail joints by wavelet packet decomposition
Publisher: SAGE Publications
Date: 07-03-2023
DOI: 10.1177/13694332231161107
Abstract: This paper proposes a crack detection method for rail joint screw holes based on the ultrasonic nonlinearity. Experimental and numerical studies are conducted to validate the performance of the proposed approach. The ultrasonic signals excited and received at the rail head are processed by spectral analysis and Wavelet Packet Decomposition (WPD). The third harmonic can be clearly observed from the spectrum analysis, which is supposed to be the nonlinearity of structures. Further, WPD is used to decompose the frequency components of the received signals. A damage index (DI) is defined based on the energy percentage of the energy in the WPD node containing the third harmonic with respect to the total energy of the received signal. It is found that the DI relating to the third harmonic increases with an approximately linear relationship when the crack grows bigger. It can provide a basis for the crack detection and quantification for the rail joint screw holes. A finite element model of the experimentally tested rail is also developed and numerical studies are conducted to verify the ultrasonic nonlinearity in the rail structure. Numerical results have the same trend with the experimental results, which verifies the effectiveness of the proposed method for crack detection in rail joints based on the high order ultrasonic nonlinear harmonics.
Experimental and numerical investigation on the compressive properties of interlocking blocks
Publisher: Elsevier BV
Date: 02-2021
Predictions of structural response to dynamic loads of different loading rates
Publisher: SAGE Publications
Date: 12-2015
DOI: 10.1260/2041-4196.6.4.585
Abstract: Owing to the increased terrorist bombing attacks, as well as accidental explosions associated with the rapid economic development and urbanization, more and more civilian structures might experience blast loadings in their service lives. These increase the demands of more structures being designed to resist certain level of blast loadings. As a result, some structural engineers with limited or no experience or training on structural dynamics nowadays might need to deal with analysis and design of structures against high-rate blast loads. Although design guides are followed, lack of fundamental knowledge of structural performance under high-rate loadings might not necessarily lead to accurate structural response predictions because the design guides normally only cover the most general and common blast loading scenarios and structural response conditions. Similarly, some researchers who have abundant experiences in analysis and design of structures under relatively low-rate dynamic loadings such as earthquake ground excitations intend to directly apply their experiences in earthquake engineering to blast resistant designs. This sometimes leads to inappropriate actions, e.g., adapting inter-storey drift as a performance criterion, using active control devices or cross bracing as a blast loading mitigation measure. This paper discusses the fundamental theory of structural dynamics, basic differences of structural responses subjected to low-rate dynamic and high-rate blast loadings. The accuracy of commonly used approaches in structural response analysis to blast loadings, i.e., the Single-Degree-of-Freedom analysis, will also be discussed.
Mesoscale modelling of concrete tensile failure mechanism at high strain rates
Publisher: Elsevier BV
Date: 11-2008
Damage evaluation of a welded beam-column joint with surface imperfections subjected to impact loads
Publisher: Elsevier BV
Date: 06-2022
Experimental investigations of fabric material against projectile impacts
Publisher: Elsevier BV
Date: 02-2016
Effect of Adding Methylcellulose on Mechanical and Vibration Properties of Geopolymer Paste and Hybrid Fiber-Reinforced Geopolymer Composite
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2020
Estimation of Strong Ground Motions in Southwest Western Australia with a Combined Green's Function and Stochastic Approach
Publisher: Informa UK Limited
Date: 14-03-2008
Laboratory test and numerical simulation of laminated glass window vulnerability to debris impact
Publisher: Elsevier BV
Date: 05-2013
A simplified statistic-based procedure for gas dispersion prediction of fixed offshore platform
Publisher: Elsevier BV
Date: 02-2018
Effect of hybrid fibers on shear behaviour of geopolymer concrete beams reinforced by basalt fiber reinforced polymer (BFRP) bars without stirrups
Publisher: Elsevier BV
Date: 07-2020
Numerical Analysis of Progressive Collapse of RC Frame Under Blast Loading
Publisher: International Association for Bridge and Structural Engineering (IABSE)
Date: 2008
DOI: 10.2749/222137908796293334
Abstract: Recently, the progressive collapse phenomenon of structures under blast loading has attracted great attention all over the world. Numerical analyses of progressive collapse of different structures have been carried out and great achievements have been accomplished. However, because of the simplification and assumption taken in the numerical analysis, current method in numerical analysis of structural progressive collapse might not give an accurate and reliable prediction of the process of structural progressive collapse. In this paper, the three dimensional model of frame structure with two spans and three storeys is set up with explicit dynamic analytical software LS-DYNA, the effects of initial damage and non-zero initial conditions of the structure member on the progressive collapse of reinforced concrete frame under blast loading are studied, the results of which are compared with the benchmark results and the results from GSA method. Based on the comparison and observation, an improved GSA method used in the analysis of progressive collapse of reinforced concrete (RC) frame is proposed, which can be used in the design of progressive collapse resistant reinforced concrete structures.
Numerical Investigation of the Dynamic Compressive Behaviour of Rock Materials at High Strain Rate
Publisher: Springer Science and Business Media LLC
Date: 06-06-2013
A state-of-the-art review on the vibration mitigation of wind turbines
Publisher: Elsevier BV
Date: 04-2020
Influence of connection properties on seismic performance of post- tensioned self-centering concrete frames
Publisher: Elsevier BV
Date: 04-2022
Dynamic material model of annealed soda-lime glass
Publisher: Elsevier BV
Date: 03-2015
Using inerter-based control device to mitigate heave and pitch motions of semi-submersible platform in the shallow sea
Publisher: Elsevier BV
Date: 03-2020
Deep residual network framework for structural health monitoring
Publisher: SAGE Publications
Date: 26-05-2020
Abstract: Convolutional neural networks have been widely employed for structural health monitoring and damage identification. The convolutional neural network is currently considered as the state-of-the-art method for structural damage identification due to its capabilities of efficient and robust feature learning in a hierarchical manner. It is a tendency to develop a convolutional neural network with a deeper architecture to gain a better performance. However, when the depth of the network increases to a certain level, the performance will degrade due to the gradient vanishing issue. Residual neural networks can avoid the problem of vanishing gradients by utilizing skip connections, which allows the information flowing to the next layer through identity mappings. In this article, a deep residual network framework is proposed for structural health monitoring of civil engineering structures. This framework is composed of purely residual blocks which operate as feature extractors and a fully connected layer as a regressor. It learns the damage-related features from the vibration characteristics such as mode shapes and maps them into the damage index labels, for ex le, stiffness reductions of structures. To evaluate the efficacy and robustness of the proposed framework, an intensive evaluation is conducted with both numerical and experimental studies. The comparison between the proposed approach and the state-of-the-art models, including a sparse autoencoder neural network, a shallow convolutional neural network and a convolutional neural network with the same structure but without skip connections, is conducted. In the numerical studies, a 7-storey steel frame is investigated. Four scenarios with considering measurement noise and finite element modelling errors in the data sets are studied. The proposed framework consistently outperforms the state-of-the-art models in all the scenarios, especially for the most challenging scenario, which includes both measurement noise and uncertainties. Experimental studies on a prestressed concrete bridge in the laboratory are conducted. The proposed framework demonstrates consistent damage prediction results on this beam with the state-of-the-art models.
Development of a new fence type blast wall for blast protection: numerical analysis
Publisher: World Scientific Pub Co Pte Lt
Date: 08-2017
DOI: 10.1142/S0219455417500663
Abstract: Blast wall is considered to be an effective passive measure for blast protection since it can effectively reduce the blast loads and protect the building structures and people behind it. However, the current practice in blast wall design mainly depends on the structural strength and ductility to resist blast loads. These designs often lead to huge solid walls which are not only expensive, but also unsuitable for construction in urban areas, as they are not aesthetically appealing. Moreover, failure of solid blast wall may generate a significant amount of debris, which imposes great threats to people and structures behind the wall. In this paper, a new fence type blast wall, instead of the solid wall, is proposed to resist the blast loads based on the concept of wave interference. The proposed fence wall uses structural columns placed at strategic locations as wave stoppers to generate wave reflection, diffraction and interaction between the reflected and diffracted waves from different columns to result in self-cancellation of wave energy, thus leads to substantial reduction in blast wall size in design. Numerical simulations are carried out to investigate the effectiveness of the fence wall layout with different column geometries, column spacing, column dimensions, and fence layers on blast loads reduction. Based on the results, an effective design of the fence type blast wall is proposed, which can reduce the pressure and impulse of the blast loads behind the wall upto 70%.
Defect detection in pipe structures using stochastic resonance of Duffing oscillator and ultrasonic guided waves
Publisher: Elsevier BV
Date: 11-2020
Study of autoclaved aerated concrete masonry walls under vented gas explosions
Publisher: Elsevier BV
Date: 06-2017
Experimental study of dynamic compressive properties of fibre reinforced concrete material with different fibres
Publisher: Elsevier BV
Date: 2012
Finite element modelling of dynamic bonding behaviours between fibre reinforced polymer sheet and concrete
Publisher: Elsevier BV
Date: 09-2020
Development and application of a deep learning-based sparse autoencoder framework for structural damage identification
Publisher: SAGE Publications
Date: 20-09-2019
Abstract: This article proposes a deep sparse autoencoder framework for structural damage identification. This framework can be employed to obtain the optimal solutions for some pattern recognition problems with highly nonlinear nature, such as learning a mapping between the vibration characteristics and structural damage. Three main components are defined in the proposed framework, namely, the pre-processing component with a data whitening process, the sparse dimensionality reduction component where the dimensionality of the original input vector is reduced while preserving the required necessary information, and the relationship learning component where the mapping between the compressed dimensional feature and the stiffness reduction parameters of the structure is built. The proposed framework utilizes the sparse autoencoders based deep neural network structure to enhance the capability and performance of the dimensionality reduction and relationship learning components with a pre-training scheme. In the final stage of training, both components are jointly optimized to fine-tune the network towards achieving a better accuracy in structural damage identification. Since structural damages usually occur only at a small number of elements that exhibit stiffness reduction out of the large total number of elements in the entire structure, sparse regularization is adopted in this framework. Numerical studies on a steel frame structure are conducted to investigate the accuracy and robustness of the proposed framework in structural damage identification, taking into consideration the effects of noise in the measurement data and uncertainties in the finite element modelling. Experimental studies on a prestressed concrete bridge in the laboratory are conducted to further validate the performance of using the proposed framework for structural damage identification.
Experimental and numerical assessment of welded steel beam-column connections under impact loading
Publisher: Elsevier BV
Date: 12-2020
Influence of Uncertain Source Parameters on Strong Ground Motion Simulation with the Empirical Green's Function Method
Publisher: Informa UK Limited
Date: 14-07-2009
Multiple-station ground motion processing and simulation based on smart-1 array data
Publisher: Elsevier BV
Date: 02-1989
Gelation crystallization of poly(L-lactide) in solvents of varying molecular size
Publisher: SAGE Publications
Date: 07-2007
DOI: 10.1177/096739110701500506
Abstract: The crystallization behaviour of poly(L-lactide) (PLLA) s les prepared in large-molecule solvents, such as poly(ethylene glycol) (PEG), was studied by differential scanning calorimetry (DSC) and X-ray diffraction. The results indicate that those s les recovered from large-molecule solvents exhibit higher crystallinity, non-isothermal crystallization temperature and faster crystallization rate than the ones crystallized in a small-molecule solvent. The crystallinity of s les from PLLA/PEG gel is about 73% measured by the DSC. The molar size of the solvent has a large influence on the formation of helical conformations and, thereby on the crystallization rate of PLLA in solution.
Anisotropic dynamic damage and fragmentation of rock materials under explosive loading
Publisher: Elsevier BV
Date: 05-2003
Experimental investigation of responses of double-helix macro BFRP fiber reinforced RC beams subjected to static and impact loads
Publisher: Elsevier BV
Date: 02-2023
Mobile crowdsensing framework for drive-by-based dense spatial-resolution bridge mode shape identification
Publisher: Elsevier BV
Date: 10-2023
A two-step numerical method for efficient analysis of structural response to blast load
Publisher: SAGE Publications
Date: 03-2011
DOI: 10.1260/2041-4196.2.1.103
Abstract: Even with modern computer power, detailed numerical modeling and simulation of structure response to blast loads are still extremely expensive and sometimes prohibitive because it is very time consuming and requires huge computer memory. Often compromise has to be made between simulation efficiency and simulation accuracy. A lot of research efforts have been spent on improving the computational efficiency. Most of these researches concentrate on simplifying the structures, such as simplifying a structure to an equivalent SDOF system, use smeared reinforcement steel and concrete model, use substructure approach to only model part of the structure in detail. Although these approaches under certain conditions yield reliable predictions, each of them has its associated limitations. Recently a two-step method was developed to improve the computation and modeling efficiency of structure response to blast loads. Instead of simplifying the structure, the proposed method calculates the structural responses in two steps. The first step calculates the structural responses in the loading phase and the second calculates the free vibration responses with the velocity profile of the structure at the end of the loading phase as initial conditions. Using a reinforced concrete beam as the ex le, it was found that the proposed method yields reliable predictions of the overall beam deflection and stress in longitudinal reinforcement bars with less than 10% computational time as compared to a detailed FE model simulation. However, the predicted stress in hoop reinforcements near the beam supports is not as good. In this paper, the method is improved by also including displacement response at the end of the forced-vibration phase as the initial conditions in the free vibration analysis. The same reinforced concrete beam is used. The results show that including the displacement initial conditions in the two-step method leads to an improved prediction of the beam responses. Parametric calculations are performed in this study by varying the blast loading litude and duration. Using the detailed FE model simulation results as benchmark, the prediction errors on various response quantities and savings on computational times of the proposed two-step method with respect to different blast loading scenarios are presented. The accuracy and efficiency of the proposed method in predicting structural responses and damage to blast loadings are demonstrated in this paper.
Target-free vision-based approach for modal identification of a simply-supported bridge
Publisher: Elsevier BV
Date: 03-2023
Predicting the response of locally resonant concrete structure under blast load
Publisher: Elsevier BV
Date: 08-2020
A novel rotational inertia damper for amplifying fluid resistance: Experiment and mechanical model
Publisher: Elsevier BV
Date: 02-2021
Experimental investigations and numerical simulations of multi-arch double-layered panels under uniform impulsive loadings
Publisher: Elsevier BV
Date: 2014
Shear behaviour of post-tensioned inter-module connection for modular steel buildings
Publisher: Elsevier BV
Date: 04-2027
Evaluation of gas explosion overpressures at configurations with irregularly arranged obstacles
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2015
Preliminary study of sandwich panel with rotational friction hinge device against blast loadings
Publisher: Trans Tech Publications, Ltd.
Date: 2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.535-536.530
Abstract: Blast-resistant structures, such as blast door panel, are designed and fabricated in a solid way to resist blast loads. This not only increases the material and construction costs, but also undermines the operational performance of the protective structures. To overcome these problems, many researchers try to use high-strength materials and different structural forms in structural design to resist the blast and impact loads. This study introduces a new configuration of sandwich door panel equipped with rotational friction hinge device with spring (RFHDS) to resist blast loading. The RFHDS can help the panel equipped with RFHDS to recover, at least partially its original configuration after blast loading and maintain its operational and blast-resistance capability after a blast event. The energy absorption and blast loading resistance capacities of this proposed sandwich panel are numerically investigated by using finite element code Ls-Dyna. It is found that the proposed sandwich door panel with RFHDS can improve the blast-resistant capacity significantly. This new configuration of sandwich door panel can be employed to mitigate blast loading effects in structural panel design.
Prediction of the impact force on reinforced concrete beams from a drop weight
Publisher: SAGE Publications
Date: 28-07-2016
Abstract: It is always a challenge to efficiently and accurately estimate the force on structures from falling objects. This study aims to predict the maximum impact force on reinforced concrete beams subjected to drop-weight impact using artificial neural network. A new empirical model including a comprehensive version and a simplified version is proposed to estimate the maximum impact force. The model was verified against a database collected from the literature including 67 reinforced concrete beams tested under drop-weight impacts. The database covers the concrete strengths ranging from 23 to 47 MPa, the projectile mass from 150 to 500 kg, and the impact velocity up to 9.3 m/s. The prediction of the comprehensive version of the proposed model fits the experimental results very well with an average absolute error of 11.6%. The simplified version of the proposed model is established for easy estimation, with the average error of 23.2% in prediction of the maximum impact force.
Numerical study of bio-inspired energy-absorbing device using shear thickening fluid (STF)
Publisher: Elsevier BV
Date: 04-2022
Application of wavelet packet transform in subsea pipeline bedding condition assessment
Publisher: Elsevier BV
Date: 06-2012
Damage identification of structures with uncertain frequency and mode shape data
Publisher: Wiley
Date: 2002
DOI: 10.1002/EQE.137
The Effect of Anchorages on FRP Strengthening of RC Walls to Resist Blast Loads
Publisher: Trans Tech Publications, Ltd.
Date: 07-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.82.497
Abstract: In this paper, the effectiveness of strengthening reinforced concrete (RC) walls with fiber reinforced polymer (FRP) bonded to RC wall with epoxy, or with epoxy plus additional boundary anchors, or distributed anchors to resist blast loads is studied. Both the bonding and anchorage strengths are modeled in numerical simulations. FRP and anchor debonding failures are modeled in the simulation. Based on numerical results, pressure-impulse (P-I) diagrams of FRP composite strengthened RC walls are generated using numerical analyses. The results show that the RC wall strengthened with FRP and anchors displays an increase in the impulse and pressure asymptote of the P-I curve as compared to those strengthened with FRP only, indicating that placing anchors to prevent FRP debonding or peeling-off increase the RC slab load carrying capacities in both the impulsive and quasi-static region.
Damage evaluation of the steel tubular column subjected to explosion and post-explosion fire condition
Publisher: Elsevier BV
Date: 10-2013
Finite element modelling of mesoscale concrete material in dynamic splitting test
Publisher: SAGE Publications
Date: 03-03-2016
Abstract: Dynamic tensile strength is one of the key factors of concrete material that needs to be accurately defined in analysis of concrete structures subjected to high-rate loadings such as blast and impact. It is commonly agreed that dynamic testing results of concrete material are influenced by the inertia effect, which is very much dependent on the specimen size and loading rate. It is therefore very important to remove the inertia effect in testing data to derive the true dynamic concrete material properties. On the other hand, coarse aggregates in concrete material are usually neglected due to testing limitation or numerical simplification. It has been acknowledged that neglecting coarse aggregates might not necessarily give accurate concrete dynamic material properties. In this study, a three-dimensional mesoscale model of concrete specimen consisting of cement mortar and coarse aggregates is developed to simulate splitting tensile tests and investigate the behaviour of concrete material at high strain rate. The commercial software LS-DYNA is used to carry out the numerical simulations of dynamic splitting tensile tests. The reliability of the numerical model in simulating the dynamic splitting tensile tests is verified by comparing the numerical results with the laboratory test data from the literature. The influence of inertia effect in dynamic splitting tensile tests is investigated and removed. An empirical formula to represent the true dynamic increase factor relations obtained from dynamic splitting tensile test is proposed and verified.
Experimental and numerical study on steel wire mesh reinforced concrete slab under contact explosion
Publisher: Elsevier BV
Date: 02-2017
Seismic response of a concrete filled steel tubular arch bridge to spatially varying ground motions including local site effect
Publisher: SAGE Publications
Date: 10-2013
DOI: 10.1260/1369-4332.16.10.1799
Abstract: The construction of concrete filled steel tubular (CFST) arch bridge has become widespread all over the world and especially in China since 1990. This paper studies the nonlinear seismic response of a CFST arch bridge on a canyon site subjected to multi-component spatially varying ground motions. The three-dimensional (3D) finite element (FE) model of the CFST arch bridge is developed with consideration of the material and geometric nonlinearities of the arch ribs. The spatially varying ground motions with consideration of wave passage effect, coherency loss effect and local site effect are stochastically simulated based on the combined one-dimensional (1D) wave propagation theory and spectral representation method. The effects of multi-component earthquake excitations, spatial variations of ground motions and varying site conditions on the seismic response of the CFST arch bridge are analysed. Numerical results show that for a reliable seismic analysis of a CFST arch bridge, multi-component earthquake excitations with consideration of ground motion spatial variations and local soil conditions should be considered.
Prediction of airblast loads on structures behind a protective barrier
Publisher: Elsevier BV
Date: 05-2008
Dynamic Compressive Test of Gas-Containing Coal Using a Modified Split Hopkinson Pressure Bar System
Publisher: Springer Science and Business Media LLC
Date: 24-08-2020
Output-only complete mode shape identification of bridges using a limited number of sensors
Publisher: Elsevier BV
Date: 10-2022
Nonlinear hysteretic parameter identification using an improved tree-seed algorithm
Publisher: Elsevier BV
Date: 05-2019
Using a single sensor for bridge condition monitoring via moving embedded principal component analysis
Publisher: SAGE Publications
Date: 31-12-2020
Abstract: This article presents a novel data-driven structural damage detection method named moving embedded principal component analysis to monitor the bridge condition and detect the damage occurrence using only one sensor. A fixed moving window is used to cut out the time series of the recorded data for the analysis. The data set inside the window is embedded to be a multidimensional state space using time delay method. The matrix of the state space is analyzed using the standard principal component analysis method, and a novel damage index R j defined with the eigenvalue is proposed to identify structural damage occurrence. The window length is determined by a new approach through examining the convergent spectrum of the contribution ratio of the first principal component of the embedded state space. The time delay is determined by the autocorrelation function of the response, and the embedding dimension is obtained by the cumulative contribution ratio of the state space. The windowed damage index can be calculated continuously by moving the window along the recorded vibration data. To demonstrate the performance of the proposed method, responses of a beam bridge model subjected to stochastic loads obtained with numerical simulations and experimental tests are analyzed to monitor the structural conditions. The results demonstrate that the proposed method can accurately identify the occurrence of damage and the abnormal behavior of the structure. The recorded data on a large suspension bridge are also analyzed. The analysis successfully identified an incident on this bridge when it was slightly scraped by the mast of a sand ship. This further verifies the effectiveness of the proposed method.
Dynamic assessment of underwater pipeline systems using statistical model updating
Publisher: World Scientific Pub Co Pte Lt
Date: 06-2008
DOI: 10.1142/S021945540800265X
Abstract: This paper presents a statistical model updating technique for damage detection of underwater pipeline systems via vibration measurements. To verify the reliability of the method, laboratory tests of a scaled pipeline model were carried out in a towing tank. The model includes a plastic pipe and some removable springs which are designed and fabricated to link the pipe and the steel base to simulate the bedding conditions. Different damage scenarios, in terms of location and severity of scouring under the pipe, were simulated by removing one or several springs. The natural frequencies, d ing ratios and mode shapes of the pipeline system were extracted from the measured vibrations using a stochastic subspace identification technique. Both the numerical and the experimental results show that the method is effective and reliable in identifying the underwater pipeline bedding conditions and the damage in the pipe structure.
Numerical simulation of pounding damage to bridge structures under spatially varying ground motions
Publisher: Elsevier BV
Date: 2013
Performance of precast segmental concrete beams posttensioned with carbon fiber-reinforced polymer (CFRP) tendons
Publisher: Elsevier BV
Date: 2019
Simplified seismic resistant design of base isolated single pylon cable-stayed bridge
Publisher: Springer Science and Business Media LLC
Date: 03-05-2018
Experimental study of mechanical properties of double-helix BFRP fiber reinforced concrete at high strain rates
Publisher: Elsevier BV
Date: 09-2022
Experimental investigation on lightweight rubberized concrete beams strengthened with BFRP sheets subjected to impact loads
Publisher: Elsevier BV
Date: 02-2020
Experimental and numerical study on concrete beams reinforced with Basalt FRP bars under static and impact loads
Publisher: Elsevier BV
Date: 05-2021
Additional afterburning energy value to simulate fully confined trinitrotoluene explosions
Publisher: SAGE Publications
Date: 18-04-2016
Abstract: Euler–Lagrange software packages are commonly employed in the analysis and design of chambers subjected to internal detonations of high explosives because they allow modeling the interaction between high-explosive gas products, air, liquid, and structures. In general, the expansion of high-explosive products is modeled by the Jones-Wilkinson and Lee equation of state, and additional extension methods such as the Miller or the additional energy release extensions are used to model the afterburning energy which is released after the detonation. These extension methods require that the additional energy by unit mass is predefined. Although the difference between the heat of combustion and the heat of detonation provides a specific value for the additional energy, for ex le, 10.01 MJ/kg TNT for trinitrotoluene charges detonated inside of chambers with rich oxygen, this value is generally inappropriate if high-explosive gas products and air are modeled separately, that is, by the Jones-Wilkinson and Lee equation of state and the ideal gas equation of state, respectively. This article explains how to determine an appropriate value for the specific additional energy value for use in the commercial software package AUTODYN for more reliable predictions of the quasi-static gas pressure in fully confined chambers subjected to trinitrotoluene explosion. The procedure detailed in this article can be applied to any kind of chamber geometries and chamber materials. A simplified chart for the afterburning energy as a function of the charge mass density is derived. The proposed approach in predicting the quasi-static gas pressure is validated with the quasi-static gas pressure described by the Unified Facilities Criteria’s guideline and some experimental tests. A procedure to determine the additional afterburning energy that should be employed for highly deformable chambers is also explained.
Axial impact behavior and energy absorption of rubberized concrete with/without fiber-reinforced polymer confinement
Publisher: SAGE Publications
Date: 20-09-2019
Abstract: This study investigates the axial impact resistance and energy absorption of rubberized concrete with/without fiber-reinforced polymer confinement. The impact tests were carried out using an instrumented drop-weight testing apparatus. The experimental results have shown that rubberized concrete significantly reduced the maximum impact force of up to 50% and extended the impact duration. These characteristics make rubberized concrete a promising material for protective structures and particularly for future sustainable construction of rigid roadside barriers. Glass fiber–reinforced polymer confinement is a very effective method to improve the impact resistance for both conventional concrete and particularly for rubberized concrete. It was found that the rubberized concrete reduced the maximum impact force so that it transferred a lower force to a protected structure as well as a lower rebound force, which is desirable for protection of passengers in an incident of vehicle collision. Interestingly, the rubberized concrete showed a lower energy absorption capacity as compared to conventional concrete, where the exact reason for this is unknown to the authors. Therefore, further research is sought to provide more understanding of the response of rubberized concrete under impact and improve its energy absorption. This study explored experimentally the use of rubberized concrete as a promising sustainable construction material for applications to construction of columns in buildings located in seismic active zones or subjected to terrorist attack, security bollards and rigid road side barriers.
Dynamic amplification factors for a system with multiple-degrees-of-freedom
Publisher: Springer Science and Business Media LLC
Date: 04-2020
Spall Behaviors of Metaconcrete: 3D Meso-Scale Modelling
Publisher: World Scientific Pub Co Pte Lt
Date: 23-04-2021
DOI: 10.1142/S0219455421501212
Abstract: Spalling is a typical tensile fracture phenomenon due to insufficient tensile strength of concrete. Concrete structure might experience severe spall damage at the rear surface of the structure owing to reflected tensile stress wave induced by impulsive load. In recent years, metaconcrete consisting of engineered aggregates has attracted attentions as metaconcrete exhibits extraordinary wave-filtering characteristics. Metaconcrete can be used to attenuate stress wave generated by impulsive load and hence possibly mitigate the spall damage. In this study, engineered aggregate is designed via the software COMSOL to have the frequency bandgap coincide with the dominant frequency band of stress wave propagating in the normal concrete (NC) specimen to reduce the stress wave propagation and hence spall damage. The wave propagation behaviors in metaconcrete specimen with periodically distributed engineered aggregates have been investigated in a previous study. This study establishes 3D meso-scale model of metaconcrete including mortar, randomly distributed natural aggregates and engineered aggregates to simulate spall behaviors of metaconcrete via the software LS-DYNA. The responses of metaconcrete composed of engineered aggregates with single bandgap and multiple bandgaps are studied. The results show that stress wave can be more effectively attenuated by using engineered aggregates with multiple bandgaps. It is found that although engineered aggregates mitigate stress wave propagation, the soft coating of the engineered aggregates reduces the concrete material strength, therefore spall damage of metaconcrete specimen is not necessarily less severe than the normal concrete, but has different damage mode. In addition, the influences of loading intensity and duration on stress wave, as well as the spall behaviors of metaconcrete specimen are also studied.
Impact response and energy absorption of single phase syntactic foam
Publisher: Elsevier BV
Date: 10-2018
Analysis of Gate Oxide Shorts in CMOS Circuits
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 1993
DOI: 10.1109/12.260643
Analysis on green building materials— Humidity adjusting materials
Publisher: IEEE
Date: 05-2011
Factors influencing impact force profile and measurement accuracy in drop weight impact tests
Publisher: Elsevier BV
Date: 11-2020
Time-varying system identification using variational mode decomposition
Publisher: Hindawi Limited
Date: 25-03-2018
DOI: 10.1002/STC.2175
3D meso-scale modelling of concrete material in spall tests
Publisher: Springer Science and Business Media LLC
Date: 12-03-2015
Dynamic tensile behaviors of welded steel joint material
Publisher: Elsevier BV
Date: 08-2021
Substructural interface force identification with limited vibration measurements
Publisher: Springer Science and Business Media LLC
Date: 25-02-2016
Experimental investigations of dynamic compressive properties of roller compacted concrete (RCC)
Publisher: Elsevier BV
Date: 04-2018
Numerical study on impact resistance of metaconcrete
Publisher: Science China Press., Co. Ltd.
Date: 10-10-2020
Effects of steel fibres and prestress levels on behaviour of newly proposed exterior dry joints using SFRC and CFRP bolts
Publisher: Elsevier BV
Date: 02-2020
Understanding Occupants’ Physical Distancing Behavior for Safer Facility Operation under COVID-19 in the Context of Educational Facilities
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2022
Hysteretic performance of RC double-column bridge piers with self-centering buckling-restrained braces
Publisher: Springer Science and Business Media LLC
Date: 20-02-2019
Sensitivity of impact behaviour of RC beams to contact stiffness
Publisher: Elsevier BV
Date: 02-2018
Seismic performance of reinforced concrete frame buildings in Bhutan based on fuzzy probability analysis
Publisher: Elsevier BV
Date: 2017
Theoretical study of dynamic elastic buckling of columns subjected to intermediate velocity impact loads
Publisher: Elsevier BV
Date: 04-2002
Experimental study of laminated glass window responses under impulsive and blast loading
Publisher: Elsevier BV
Date: 04-2015
Response of two-way eccentric building to nonuniform base excitations
Publisher: Elsevier BV
Date: 08-1998
Wave flume tests of a semi-submersible platform controlled by a novel rotational inertia damper
Publisher: Elsevier BV
Date: 10-2021
Free Vibration and Buckling Analysis of Axially Loaded Double-Beam Systems with Generalized Boundary Conditions
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2023
The Dynamic Performance of Copper under Impact Loading
Publisher: Maxwell Scientific Publication Corp.
Date: 20-05-2013
Free and Forced Vibrations of an Undamped Double-Beam System Carrying a Tip Mass with Rotary Inertia
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2022
Cyclic test and numerical study of precast segmental concrete columns with BFRP and TEED
Publisher: Springer Science and Business Media LLC
Date: 19-03-2019
Dynamic compressive behaviour of spiral steel fibre reinforced concrete in split Hopkinson pressure bar tests
Publisher: Elsevier BV
Date: 11-2013
Discussion on the suitability of dynamic constitutive models for prediction of geopolymer concrete structural responses under blast and impact loading
Publisher: Elsevier BV
Date: 02-2022
Modelling and simulation of spatially varying earthquake ground motions at sites with varying conditions
Publisher: Elsevier BV
Date: 07-2012
Effect of fibre reinforcements on shear capacity of geopolymer concrete beams subjected to impact load
Publisher: Elsevier BV
Date: 2022
Modelling of shear keys in bridge structures under seismic loads
Publisher: Elsevier BV
Date: 07-2015
Numerical study of the influences of pressure confinement on high-speed impact tests of dynamic material properties of concrete
Publisher: Elsevier BV
Date: 05-2018
Devices for protecting bridge superstructure from pounding and unseating damages: an overview
Publisher: Informa UK Limited
Date: 20-04-2017
Optimal blast wall layout design to mitigate gas dispersion and explosion on a cylindrical FLNG platform
Publisher: Elsevier BV
Date: 09-2017
Bridge condition monitoring under moving loads using two sensor measurements
Publisher: SAGE Publications
Date: 24-08-2020
Abstract: A novel damage detection approach using only two sensors to detect the damage in beam bridges subjected to a moving vehicle is proposed in this article. In this approach, a moving mass is considered representing a vehicle moving across the bridge, and structural vibration responses at two locations are measured from a pair of sensors. A moving window is defined with a certain length determined by the s ling frequency and the fundamental frequency of the measured responses. The windowed pair time series extracted from these two measured responses are used to calculate the cross-correlation, which is used to define the local damage index. A simply supported beam bridge subjected to a moving mass is simulated to demonstrate the effectiveness and accuracy of the proposed approach. Numerical results indicate that the proposed approach can accurately identify the single and multiple damages using both displacement and acceleration responses, even when the responses are smeared with a significant noise. This indicates a good robustness to the noise effect. Experimental verifications on a laboratory beam bridge model demonstrate that the proposed approach can successfully identify the damage location using different selections of sensor pairs. Both the numerical and experimental results demonstrate that the new damage index is a good candidate for structural damage detection with very limited measurement information.
Development and experimental verification of an IoT sensing system for drive-by bridge health monitoring
Publisher: Elsevier BV
Date: 10-2023
A comparative study on the most effective machine learning model for blast loading prediction: From GBDT to Transformer
Publisher: Elsevier BV
Date: 02-2023
Impact Response of Prestressed Prefabricated Segmental and Monolithic Basalt-FRP-Reinforced Geopolymer Concrete Beams
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2023
Failure behaviors of oriented strand board material under quasi-static and dynamic loads
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2018
Review of piezoelectric impedance based structural health monitoring: Physics-based and data-driven methods
Publisher: SAGE Publications
Date: 16-08-2021
DOI: 10.1177/13694332211038444
Abstract: Vibration based structural health monitoring methods are usually dependent on the first several orders of modal information, such as natural frequencies, mode shapes and the related derived features. These information are usually in a low frequency range. These global vibration characteristics may not be sufficiently sensitive to minor structural damage. The alternative non-destructive testing method using piezoelectric transducers, called as electromechanical impedance (EMI) technique, has been developed for more than two decades. Numerous studies on the EMI based structural health monitoring have been carried out based on representing impedance signatures in frequency domain by statistical indicators, which can be used for damage detection. On the other hand, damage quantification and localization remain a great challenge for EMI based methods. Physics-based EMI methods have been developed for quantifying the structural damage, by using the impedance responses and an accurate numerical model. This article provides a comprehensive review of the exciting researches and sorts out these approaches into two categories: data-driven based and physics-based EMI techniques. The merits and limitations of these methods are discussed. In addition, practical issues and research gaps for EMI based structural health monitoring methods are summarized.
Substructure damage identification based on wavelet-domain response reconstruction
Publisher: SAGE Publications
Date: 07-05-2014
Abstract: This article presents experimental verification on damage identification of a substructure using a wavelet-domain response reconstruction technique. The response reconstruction is based on the unit impulse response function in the wavelet domain to form a transformation matrix between two different sets of time-domain response vectors. The initial finite element model updating is performed to achieve an accurate model in the intact stage as a baseline, and measured acceleration responses from the damaged substructure are used for the damage identification. Substructure damage identification is conducted by minimizing the discrepancy between a measured response vector and the reconstructed one. A dynamic response sensitivity-based model updating method is used for the identification of the target substructure. Local damage is identified as a change in the elemental stiffness factors. The adaptive Tikhonov regularization technique is adopted to improve the identification results with measured responses including measurement and environmental noises in laboratory. Experimental studies on a 7-storey plane frame structure are conducted to investigate the accuracy of the presented response reconstruction technique and the performance of substructure damage identification approach. Good response reconstruction accuracy is obtained with the baseline model, and the introduced damages in the substructure can be identified effectively. The damage locations are identified correctly with a close estimation of damage extents.
Structure damage detection using neural network with multi-stage substructuring
Publisher: SAGE Publications
Date: 02-2010
DOI: 10.1260/1369-4332.13.1.95
Abstract: Artificial neural network (ANN) method has been proven feasible by many researchers in detecting damage based on vibration parameters. However, the main drawback of ANN method is the requirement of enormous computational effort especially when complex structures with large degrees of freedom are involved. Consequently, almost all the previous works described in the literature limited the structural members to a small number of large elements in the ANN model which resulted ANN model being insensitive to local damage. This study presents an approach to detect small structural damage using ANN method with progressive substructure zooming. It uses the substructure technique together with a multi-stage ANN models to detect the location and extent of the damage. Modal parameters such as frequencies and mode shapes are used as input to ANN. To demonstrate the effectiveness of this approach, a two-span continuous concrete slab structure and a three-storey portal frame are used as ex les. Different damage scenarios have been introduced by reducing the local stiffness of the selected elements at different locations in the structures. The results show that this technique successfully detects all the simulated damages in the structure.
Experimental and numerical assessment of stress wave attenuation of metaconcrete rods subjected to impulsive loads
Publisher: Elsevier BV
Date: 2022
Impact Behavior of FRP-Strengthened RC Beams without Stirrups
Publisher: American Society of Civil Engineers (ASCE)
Date: 08-2016
Improving identifiability of structural damage using higher order responses and phase space technique
Publisher: Hindawi Limited
Date: 10-06-2021
DOI: 10.1002/STC.2808
Development and application of a relative displacement sensor for structural health monitoring of composite bridges
Publisher: Hindawi Limited
Date: 21-10-2015
DOI: 10.1002/STC.1714
Parametric Study of Truncated Square Pyramid Folded Structure for Effective Energy Absorption under Static and Dynamic Crushing
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-2022
Nonlinear structural damage detection using output-only Volterra series model
Publisher: Hindawi Limited
Date: 26-05-2021
DOI: 10.1002/STC.2802
Experimental and numerical study of composite lightweight structural insulated panel with expanded polystyrene core against windborne debris impacts
Publisher: Elsevier BV
Date: 08-2014
Structural damage detection using low-rank matrix approximation and cointegration analysis
Publisher: Elsevier BV
Date: 09-2022
Civil structure condition assessment by FE model updating: Methodology and case studies
Publisher: Elsevier BV
Date: 09-2001
Simulation of structural response under high-frequency ground excitation
Publisher: Wiley
Date: 2001
DOI: 10.1002/EQE.8
Characterisation of underground blast-induced ground motions from large-scale field tests
Publisher: Springer Science and Business Media LLC
Date: 11-2003
Experimental investigation of monolithic tempered glass fragment characteristics subjected to blast loads
Publisher: Elsevier BV
Date: 09-2014
Influence of global stiffness and equivalent model on prediction of impact response of RC beams
Publisher: Elsevier BV
Date: 03-2018
Detection of delamination between steel bars and concrete using embedded piezoelectric actuators/sensors
Publisher: Springer Science and Business Media LLC
Date: 09-02-2013
Stochastic dynamic analysis of marine risers considering fluid-structure interaction and system uncertainties
Publisher: Elsevier BV
Date: 11-2019
Dynamic assessment of shear connection conditions in slab-girder bridges by Kullback-Leibler distance
Publisher: SAGE Publications
Date: 05-2012
DOI: 10.1260/1369-4332.15.5.771
Abstract: Shear connectors are widely used in composite bridges that provide composite action. Their damage will reduce the load-carrying capacity of the structure. In this study, a novel method based on Kullback-Leibler distance (KLD) was developed to assess the integrity of the shear connectors. A bridge model was constructed in the laboratory and some removable anchors were specially designed and fabricated to link the beams and slab that were cast separately. Each anchor consists of a threaded bar that penetrates through the soffit of the beam and ties up into an embedded nut cap to simulate a shear connector in the real bridges. Different damage scenarios were introduced by pulling out some connectors. Vibration tests were carried out in each damage scenario. Various damage detection methods have been applied and results show that the method was able to detect all the assumed damage scenarios successfully and consistently.
Vibration-Based Damage Detection of Pipeline System by HHT Method
Publisher: Trans Tech Publications, Ltd.
Date: 09-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.99-100.1067
Abstract: Pipelines are regarded as the most cost-effective and the safest choice for transporting oil in bulk. In this study, the significance and necessity of conducting damage detection for onshore pipelines is firstly stated. Then, the limitations of current measures in use in pipeline industry and the inherent difficulty of applying vibration-based damage detection techniques (VBDT) to pipeline structures are addressed. This study focuses on exploring the applicability of an advanced VBDT method, HHT method, to the condition assessment of onshore pipelines. The feasibility and effectiveness of HHT method is verified through numerical study. The result shows that for the cases with single or multi segments of damage which are of the same type or of different types coexist in the structure, the HHT method is capable of providing very good results for the damage detection of pipeline system under ambient excitations. The obtained Hilbert spectrum gives very explicit presentation of the structural response’s energy distribution in both time and frequency domain, the marginal spectrum offers satisfactory result not only for locating the damaged area but also for a rough estimate of damage severity.
Characteristics of stress waves recorded in small-scale field blast tests on a layered rock-soil site
Publisher: Thomas Telford Ltd.
Date: 08-2003
DOI: 10.1680/GEOT.2003.53.6.587
Abstract: A series of field blast tests was carried out in Singapore to study the properties of stress waves inside (free field) and on the surface of a granite site. The stress wave properties inside the granite mass and on the rock surface, such as the peak value and principal frequency, as well as their spatial variations, were reported in a previous paper. Before the blast test, a soil layer of 1·5 m thickness was backfilled and compacted on the quarry test site. Accelerometers were also placed on the surface of the backfilled soil layer, inside the soil mass and on the rock–soil interface. This paper presents the recorded data associated with the backfilled soil layer. The attenuation relations of the peak particle acceleration (PPA), peak particle velocity (PPV) and especially the principal frequency (PF) of the stress wave on the soil surface, inside the soil mass and on the rock–soil surface are derived. They are compared with those recorded inside the granite mass and on the rock surface. Based on the results, the effects of different media on the stress wave propagation are discussed.
Numerical study of the seismic performance and damage mitigation of steel-concrete composite rigid-frame bridge subjected to across-fault ground motions
Publisher: Springer Science and Business Media LLC
Date: 21-09-2020
Nonlinear finite element analysis of barge collision with a single bridge pier
Publisher: Elsevier BV
Date: 08-2012
A parametric study of the required seating length for bridge decks during earthquake
Publisher: Wiley
Date: 1998
DOI: 10.1002/(SICI)1096-9845(199801)27:1<91::AID-EQE722>3.0.CO;2-I
Proposed new dry and hybrid concrete joints with GFRP bolts and GFRP reinforcement under cyclic loading: Testing and analysis
Publisher: Elsevier BV
Date: 05-2022
Some special phenomena and preliminary interpretations about measured strain signals from high-speed impact tests
Publisher: Inderscience Publishers
Date: 2201
Functionally graded truncated square pyramid folded structures with foam filler under dynamic crushing
Publisher: Elsevier BV
Date: 11-2019
Rectangular Stress-block Parameters for Fly-ash and Slag Based Geopolymer Concrete
Publisher: Elsevier BV
Date: 06-2019
Performance of geopolymer concrete in monolithic and non-corrosive dry joints using CFRP bolts under cyclic loading
Publisher: Elsevier BV
Date: 02-2021
Static and dynamic material properties of CFRP/epoxy laminates
Publisher: Elsevier BV
Date: 07-2016
Effect of aggregate size on bond behaviour between basalt fibre reinforced polymer sheets and concrete
Publisher: Elsevier BV
Date: 02-2019
Numerical analysis of concrete material properties at high strain rate under direct tension
Publisher: Elsevier BV
Date: 2011
Generation of probabilistic displacement response spectra for displacement-based design
Publisher: Elsevier BV
Date: 02-2004
Far-field pressure prediction of a vented gas explosion from storage tanks by using new CFD simulation guidance
Publisher: Elsevier BV
Date: 10-2018
Failure mechanism of geopolymer composite lightweight sandwich panel under flexural and edgewise compressive loads
Publisher: Elsevier BV
Date: 02-2021
Numerical prediction of statistical masonry wall fragment distribution induced by blast loading
Publisher: Springer Science and Business Media LLC
Date: 29-10-2008
Performances of a new sustainable and durable dry beam-column joints under cyclic and impact loads
Publisher: Springer Science and Business Media LLC
Date: 24-10-2023
Computer vision based target-free 3D vibration displacement measurement of structures
Publisher: Elsevier BV
Date: 11-2021
Damage assessment of masonry infilled RC frames subjected to blasting induced ground excitations
Publisher: Elsevier BV
Date: 06-2002
An integrated model for vent area design of hydrocarbon-air mixture explosion inside cubic enclosures with obstacles
Publisher: Elsevier BV
Date: 2019
Structural damage detection via phase space based manifold learning under changing environmental and operational conditions
Publisher: Elsevier BV
Date: 07-2022
Seismic performance of RC frames designed for three different ductility levels
Publisher: Elsevier BV
Date: 05-2001
Prediction of fragment size and ejection distance of masonry wall under blast load using homogenized masonry material properties
Publisher: Elsevier BV
Date: 06-2009
Experimental investigation of the behaviour of spiral steel fibre reinforced concrete beams subjected to drop-weight impact loads
Publisher: Springer Science and Business Media LLC
Date: 16-12-2016
Time-Varying System Identification of Precast Segmental Columns Subjected to Seismic Excitations
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2022
Damage detection in bridge structures under moving loads with phase trajectory change of multi-type vibration measurements
Publisher: Elsevier BV
Date: 03-2017
Damage detection of shear connectors under moving loads with relative displacement measurements
Publisher: Elsevier BV
Date: 08-2015
Safe scaled distance for masonry infilled RC frame structures subjected to airblast loads
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2007
Experimental and analytical investigation on flexural behaviour of ambient cured geopolymer concrete beams reinforced with steel fibers
Publisher: Elsevier BV
Date: 12-2019
Fuzzy-random probabilistic analysis of rock mass responses to explosive loads
Publisher: Elsevier BV
Date: 12-1999
Effect of engineered aggregate configuration and design on stress wave attenuation of metaconcrete rod structure
Publisher: Elsevier BV
Date: 12-2021
A NUMERICAL STUDY OF DAMAGE DETECTION OF UNDERWATER PIPELINE USING VIBRATION-BASED METHOD
Publisher: World Scientific Pub Co Pte Ltd
Date: 05-2012
DOI: 10.1142/S0219455412500216
Abstract: This paper presents a numerical investigation of the feasibility of condition monitoring of untrenched pipelines at seabed through ambient vibration measurements. A finite element (FE) model is developed to calculate the dynamic responses of pipelines to ambient wave forces. The model takes into consideration the interaction between the ocean waves, submarine pipeline, and seabed. The fluid around the pipeline is simulated using the acoustic fluid elements, while soil is simulated by springs and dashpots. The ambient hydrodynamic force in the marine environment is simulated based on the Joint North Sea Wave Observation Project (JONSWAP) spectrum. The transfer function from the wave surface elevation to the wave force is used to get the wave force spectrum. The dynamic responses of the pipe structure with different assumed damage conditions to the ambient wave forces are calculated. The calculated dynamic responses are assumed as measured ambient vibration data in condition monitoring to extract the pipeline vibration properties, which in turn are used in the FE model updating calculation to identify the pipeline conditions. Different noise levels are introduced into the calculated dynamic responses to simulate uncertainties that may arise from measurement and ambient hydrodynamic environment. The effect of noise levels on the extraction of pipeline vibration properties, and on the identification of the pipeline conditions is investigated.
Influence of end friction confinement on impact tests of concrete material at high strain rate
Publisher: Elsevier BV
Date: 10-2013
Gas explosion analysis of safety gap effect on the innovating FLNG vessel with a cylindrical platform
Publisher: Elsevier BV
Date: 11-2016
Experimental and numerical study of basalt fibre cloth strengthened structural insulated panel under windborne debris impact
Publisher: SAGE Publications
Date: 05-08-2016
Abstract: Strong wind causes damages and losses around the world. The windborne debris carried by strong wind might impact on building and create openings on the building envelop, which might threaten the occupants and cause further damages to the building. To address this issue, some wind loading codes including the Australian Wind Loading Code (AS/NZS 1170:2:2011) give design requirements. The resistance capacity of oriented strand board skins structural insulated panel was investigated and proved having low resistance to the projectile impact, and could not meet the impact resistance requirement for application in cyclonic region C and D defined in Australian Wind Loading Code. In this study, basalt fibre cloth is used to strengthen oriented strand board structural insulated panel to increase its capacity to resist windborne debris impact. This paper presents experimental and numerical study of structural insulated panel with or without basalt fibre cloth strengthening under windborne debris impact. Five specimens with different configurations were tested. The dynamic responses were quantitatively compared in terms of residual speed of debris after impact. The results indicate that basalt fibre cloth enhanced the resistance capacity of oriented strand board structural insulated panel. A numerical model is developed in LS-DYNA to simulate the debris impact. The testing results are used to verify the accuracy of the numerical model, which can be used in subsequent parametric studies.
Seismic response of asymmetric structures to multiple ground motions
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-1995
Using multiple tuned mass dampers to control offshore wind turbine vibrations under multiple hazards
Publisher: Elsevier BV
Date: 06-2017
Salivary inflammatory biomarkers are predictive of mild cognitive impairment and Alzheimer’s disease in a feasibility study
Publisher: Frontiers Media SA
Date: 10-11-2022
DOI: 10.3389/FNAGI.2022.1019296
Abstract: Alzheimer’s disease (AD) is an insidious disease. Its distinctive pathology forms over a considerable length of time without symptoms. There is a need to detect this disease, before even subtle changes occur in cognition. Hallmark AD biomarkers, tau and amyloid-β, have shown promising results in CSF and blood. However, detecting early changes in these biomarkers and others will involve screening a wide group of healthy, asymptomatic in iduals. Saliva is a feasible alternative. S le collection is economical, non-invasive and saliva is an abundant source of proteins including tau and amyloid-β. This work sought to extend an earlier promising untargeted mass spectrometry study in saliva from in iduals with mild cognitive impairment (MCI) or AD with age- and gender-matched cognitively normal from the South Australian Neurodegenerative Disease cohort. Five proteins, with key roles in inflammation, were chosen from this study and measured by ELISA from in iduals with AD ( n = 16), MCI ( n = 15) and cognitively normal ( n = 29). The concentrations of Cystatin-C, Interleukin-1 receptor antagonist, Stratifin, Matrix metalloproteinase 9 and Haptoglobin proteins had altered abundance in saliva from AD and MCI, consistent with the earlier study. Receiver operating characteristic analysis showed that combinations of these proteins demonstrated excellent diagnostic accuracy for distinguishing both MCI (area under curve = 0.97) and AD (area under curve = 0.97) from cognitively normal. These results provide evidence for saliva being a valuable source of biomarkers for early detection of cognitive impairment in in iduals on the AD continuum and potentially other neurodegenerative diseases.
A new method for progressive collapse analysis of RC frames under blast loading
Publisher: Elsevier BV
Date: 06-2010
Experimental investigation of spatially varying effect of ground motions on bridge pounding
Publisher: Wiley
Date: 20-02-2012
DOI: 10.1002/EQE.2168
Influence of ground motion spatial variation, site condition and SSI on the required separation distances of bridge structures to avoid seismic pounding
Publisher: Wiley
Date: 23-11-2010
DOI: 10.1002/EQE.1076
Influence of irregular topography and random soil properties on coherency loss of spatial seismic ground motions
Publisher: Wiley
Date: 22-11-2011
DOI: 10.1002/EQE.1077
Crashworthiness analysis of bio-inspired fractal tree-like multi-cell circular tubes under axial crushing
Publisher: Elsevier BV
Date: 12-2021
A parametric study on the evaluation of ductility demand distribution in multi-degree-of-freedom systems considering soil-structure interaction effects
Publisher: Elsevier BV
Date: 10-2012
Numerical analysis of the stability of abandoned cavities in bench blasting
Publisher: Elsevier BV
Date: 02-2017
Numerical study on the seismic performance of precast segmental concrete columns under cyclic loading
Publisher: Elsevier BV
Date: 10-2017
Simulation of subsea seismic ground motions
Publisher: CRC Press
Date: 25-08-2017
Simulation of subsea seismic ground motions
Publisher: CRC Press
Date: 25-08-2017
Numerical analysis of dynamic buckling of rectangular plates subjected to intermediate-velocity impact
Publisher: Elsevier BV
Date: 02-2001
Pounding response of adjacent buildings subjected to spatial earthquake ground excitations
Publisher: SAGE Publications
Date: 04-2000
Abstract: Pounding damage is a serious seismic hazard in highly populated areas during major earthquakes. This paper evaluates the effect of earthquake ground motion spatial variations on pounding responses of adjacent structures. Adjacent structures are modeled as two single-degree-of-freedom (SDOF) oscillators with multiple supports. Pounding effects are simulated by spring-dashpot pounding elements. Linear elastic and nonlinear inelastic responses are considered in the analysis. Spatial ground motion input is stochastically simulated. The simulated spatial ground motion time histories are compatible with Newmark and Hall design spectrum in idually and with an empirical coherency function between each other. The Newmark method with constant acceleration assumption is employed in step-by-step integration to calculate structural response. Numerical results are presented and discussed in terms of various structural and ground motion parameters.
Structural damage identification based on autoencoder neural networks and deep learning
Publisher: Elsevier BV
Date: 10-2018
Effectiveness of Using RFHDS Connected PIP System for Subsea Pipeline Vibration Control
Publisher: World Scientific Pub Co Pte Lt
Date: 08-2018
DOI: 10.1142/S0219455418400059
Abstract: Pipe-in-pipe (PIP) system can be considered as a structure-tuned mass d er (TMD) system by replacing the hard centralizers by the softer springs and dashpots to connect the inner and outer pipes. With properly designed connecting devices, PIP system therefore has the potential to mitigate the subsea pipeline vibrations induced by various sources, such as earthquake or vortex shedding. This study proposes using rotational friction hinge d ers with springs (RFHDSs) to connect the inner and outer pipes. The rotational friction hinge d ers (RFHDs) are used to absorb the energy induced by the external vibration sources and the springs are used to provide the stiffness to the TMD system and to restore the original locations of the inner and outer pipes. To investigate the effectiveness of this new design concept, detailed three-dimensional (3D) finite element (FE) model of the RFHD is developed in ANSYS and the hysteretic behavior of RFHD is firstly studied. The calculated hysteretic loop is then applied to the 3D PIP FE model to estimate the seismic responses. The effectiveness of the proposed system to mitigate seismic induced vibrations is examined by comparing the seismic responses of the proposed system with the conventional PIP system. The influences of various parameters, such as the preload on the bolt, the friction coefficient and the spring stiffness, on the RFHD hysteresis behavior and on the seismic responses of PIP system are investigated and some suggestions on the RFHDS design are made.
Experimental and numerical validation of impact mitigation capability of meta-panels
Publisher: Elsevier BV
Date: 10-2022
Impact behavior of beam-column joint with geometric imperfections at weld root
Publisher: Elsevier BV
Date: 09-2022
Ductility spectra of reinforced concrete structures subjected to far-field seismic excitations
Publisher: Elsevier BV
Date: 07-1997
Simulations of explosion-induced damage to underground rock chambers
Publisher: Elsevier BV
Date: 03-2011
Bond behaviour between hybrid fiber reinforced polymer sheets and concrete
Publisher: Elsevier BV
Date: 06-2019
Modeling and Simulation of Spatially Correlated Ground Motions at Multiple Onshore and Offshore Sites
Publisher: Informa UK Limited
Date: 31-05-2017
RC column failure probabilities to blast loads
Publisher: SAGE Publications
Date: 12-2010
DOI: 10.1260/2041-4196.1.4.571
Abstract: Structural reliability analyses are commonly applied to estimation of probabilities of structural damage to static and dynamic loads such as earthquake, wind and wave loads. Although blast loadings acting on structures from accidental explosions or hostile bombings are very difficult to be accurately predicted owing to many uncertain parameters that influence explosion shock wave propagation and shock wave interaction with structures, reliability analyses of structural failure to blast loadings with consideration of uncertainties in blast loading and structural parameters are very limited. Instead, a large safety factor is usually used to account for uncertain variations in blast loading and structural parameters in blast-resistant design and analysis. This may lead to an inaccurate design of structures to resist blast loads, and an inaccurate assessment of structure performance in a given explosion scenario. In this study, reliability analyses of three ex le RC columns to randomly varying blast loads are carried out. The column dimensions, reinforcement ratios and material strengths are assumed to be normally distributed with the respective design parameters as the mean values. The mean value and standard deviation of the peak reflected pressure and duration of the blast load at various scaled distances are derived from available empirical formulae, and are used in this study to model the blast pressure variations. Failure probabilities of the ex le RC columns subjected to blast loads of different scaled distances are estimated. Numerical results are compared with those obtained with the deterministic blast loading or deterministic column property assumptions. The importance of considering the random variations of structural properties and blast loadings in assessing the blast load effects on RC columns is discussed.
Mesoscale modelling of fibre reinforced concrete material under compressive impact loading
Publisher: Elsevier BV
Date: 2012
Numerical simulation of stress wave interaction in short-delay blasting with a single free surface
Publisher: Public Library of Science (PLoS)
Date: 26-09-2018
Scaled-Distance Relationships For Chamber Blast Accidents in Underground Storage of Explosives
Publisher: Informa UK Limited
Date: 03-2001
Hybrid 2D perovskite and red emitting carbon dot composite for improved stability and efficiency of LEDs
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2NR06942C
Abstract: To improve operational stability of perovskite (PSK) LEDs, we used red-emitting hydrophobic carbon dots to impart structural stability to 2D PSK and reduce band offset, improving the operational stability of device to 8 hours from less than 2 hours.
Experimental and numerical study of the performance of geopolymer concrete columns reinforced with BFRP bars subjected to lateral impact loading
Publisher: Elsevier BV
Date: 11-2022
Influence of brittle shear damage on accuracy of the two-step method in prediction of structural response to blast loads
Publisher: Elsevier BV
Date: 04-2013
Dynamic response reconstruction for structural health monitoring using densely connected convolutional networks
Publisher: SAGE Publications
Date: 24-05-2020
Abstract: This article proposes a novel dynamic response reconstruction approach for structural health monitoring using densely connected convolutional networks. Skip connection and dense block techniques are carefully applied in the designed network architecture, which greatly facilitates the information flow, and increases the training efficiency and accuracy of feature extraction and propagation with fewer parameters in the network. Sub-pixel shuffling and dropout techniques are used in the designed network and applied to reduce the computational demand and improve training efficiency. The network is trained in a supervised manner, where the input and output are the measurements of the available channels at response available locations and desired channels at response unavailable locations. The proposed densely connected convolutional networks automatically extract the high-level features of the input data and construct the complicated nonlinear relationship between the responses of available and desired locations. Experimental studies are conducted using the measured acceleration responses from Guangzhou New Television Tower to investigate the effects of the locations of available responses, the numbers of available and unavailable channels, and measurement noise. The results demonstrate that the proposed approach can accurately reconstruct the responses in both time and frequency domains with strong noise immunity. The reconstructed response is further used for modal identification to demonstrate the usability and accuracy of the reconstructed responses. The applicability of the proposed approach for structural health monitoring is further proved by the highly consistent modal parameters identified from the reconstructed and true responses.
Damage Detection of Shear Connectors Based on Power Spectral Density Transmissibility
Publisher: Trans Tech Publications, Ltd.
Date: 07-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.569-570.1241
Abstract: Damage of shear connectors in slab-on-girder structures will result in shear slippage between slab and girder, which significantly reduces the load-carrying capacity of the bridge. This paper proposes a dynamic damage detection approach to identify the damage of shear connectors in slab-on-girder bridges with power spectral density transmissibility (PSDT). PSDT formulates the relationship between the auto-spectral density functions of two responses. Measured impact force and acceleration responses from hammer tests are analyzed to obtain the frequency response functions at the slab and girder sensor locations by experimental modal analysis. When measurement data from the undamaged structure are available, PSDT from the slab response to the girder response is derived with the obtained frequency response functions. PSDT matrices in the undamaged and damaged states are directly compared to identify the damage of shear connectors. When the measurement data from the undamaged structure are not available, PSDT matrices from measured response at a reference sensor response to those of the slab and girder in the damaged state can also be used to detect the damage of shear connectors. Experimental studies with a concrete slab supported by two steel girders are conducted to investigate the accuracy and efficiency of the proposed approach. Identification results demonstrated that damage of shear connectors can be identified accurately and efficiently with and without measurement data from the undamaged structure.
Debond Detection in RC Structures using piezoelectric materials
Publisher: CRC Press
Date: 10-2009
Damage identification of steel beams using local and global methods
Publisher: SAGE Publications
Date: 05-2012
DOI: 10.1260/1369-4332.15.5.807
Abstract: Structural condition monitoring methods can be generally classified as local and global. While the global method needs only a small number of sensors to measure the low-frequency structural vibration properties, the acquired information is often not sufficiently sensitive to minor damages in a structure. Local methods, on the other hand, could be very sensitive to minor damages but their detection range is usually small. To overcome the drawbacks and take advantage of both methods, an integrated condition monitoring system has been recently developed for structural damage detection, which combines guided wave and structural vibration tests. This study aims at finding a viable damage identification method for steel structures by using this system. First, a spectral element modelling method is developed, which can simulate both wave propagation and structural vibration properties. Then the model is used in updating analysis to identify crack damage. Extensive numerical simulations and model updating works are conducted. The experimental and numerical results suggest that simply combining the objective functions cannot provide better structural damage identification. A two-stage damage identification scheme is more suitable for identifying damage in steel beams.
Condition assessment of prestressed concrete structures with static and dynamic damage indexes
Publisher: CRC Press
Date: 10-2009
Guest editorial
Publisher: Springer Science and Business Media LLC
Date: 2019
Strain transfer analysis of embedded fiber bragg grating strain sensor
Publisher: ASTM International
Date: 10-11-2016
DOI: 10.1520/JTE20140388
New interlocking inter-module connection for modular steel buildings: Experimental and numerical studies
Publisher: Elsevier BV
Date: 11-2019
X-ray diffraction line profile analysis of acid-resistant goethite in Western Australian nickel laterite ore
Publisher: International Union of Crystallography (IUCr)
Date: 09-05-2015
DOI: 10.1107/S1600576715006275
Abstract: The goethite peaks in synchrotron and laboratory X-ray powder diffraction (XRPD) patterns of an acid-resistant nickel laterite ore s le from a site in Western Australia exhibit a `super-Lorentzian' shape. The method for extracting the coherently scattering domain size distribution published by Leoni & Scardi [ J. Appl. Cryst. (2004), 37 , 629–634] is adapted to fit the asymmetric goethite peak profiles, allowing the refinement of lattice parameters for multiple goethite structural models while maintaining their relationships. The anisotropic peak broadening due to the acicular shape of the goethite crystals is addressed using spherical harmonics predefined from an XRPD pattern of a synthetic goethite s le. A bimodal coherently scattering domain size distribution of goethite crystals is predicted from the goethite profile fitting and agrees with previous transmission electron microscopy findings that two goethite populations with different domain sizes and metal substitutions exist in the ore s le. The small goethite size fraction dissolved slowly during atmospheric acid leaching, while the large goethite fraction barely dissolved. Caustic pre-treatment by KOH digestion significantly enhanced the acid-leaching performance of the small goethite fraction, but had no effect on the large goethite fraction. This study demonstrates that quantitative phase analysis on designated goethite size fractions can successfully fit the super-Lorentzian shaped line profiles of natural goethite crystals with a confirmed bimodal domain size distribution.
Dynamic compressive properties of metaconcrete material
Publisher: Elsevier BV
Date: 10-2022
Experimental investigation of resistance function of RC beam considering membrane effects
Publisher: Elsevier BV
Date: 09-2022
Laboratory test and numerical study of structural insulated panel strengthened with glass fibre laminate against windborne debris impact
Publisher: Elsevier BV
Date: 07-2016
An innovative pendulum-type column-in-column (PCIC) system for structural vibration control induced by seismic ground excitations
Publisher: Elsevier BV
Date: 04-2022
A Simplified Approach for Predicting Bridge Pier Responses Subjected to Barge Impact Loading
Publisher: SAGE Publications
Date: 2014
DOI: 10.1260/1369-4332.17.1.11
Abstract: Bridge piers are often designed to resist barge impact loads according to empirical equations given in various design codes based primarily on equivalent static analyses. Although these analyses can give useful guidance in design practice, they neglect dynamic effects which can have significant influence on barge-bridge structure interactions. It is necessary to develop an efficient and accurate method that takes into consideration of dynamic effect, material nonlinearity and structural damage in predicting impact loads and structural responses. In this study, empirical equations based on intensive numerical simulation results proposed in a previous study are used to estimate dynamic impact loads on bridge piers. The bridge structure is simplified as a nonlinear single degree of freedom system to calculate its dynamic response. As compared to detailed finite element simulation, this simplified approach is straightforward and gives reasonably accurate prediction of bridge responses. It can be used in the preliminary analysis and design of bridge structures against barge impact.
Numerical study of using shape memory alloy-based tuned mass dampers to control seismic responses of wind turbine tower
Publisher: Elsevier BV
Date: 2022
Elastic-Plastic Dynamic Response and Buckling of Steel Columns under Strong Vertical Ground Motion
Publisher: Trans Tech Publications, Ltd.
Date: 2003
Numerical Study of Corrugated Metal Panels Subjected to Windborne Debris Impacts
Publisher: Trans Tech Publications, Ltd.
Date: 08-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.626.109
Abstract: Hurricane, typhoon and cyclone take place more and more often around the world with changing climate. Such nature disasters cause tremendous economic loss and casualty. Various kinds of windborne debris such as compact-like, plate-like and rod-like objects driven by hurricane usually imposes localized impact loading on the structure envelopes such as cladding, wall or roof, etc. The dominant opening in the envelope might cause serious damage to the structures, even collapse. To withstand the impact of such extreme event, the requirements on panel capacity to resist windborne debris impact has been presented in the Australian Wind Loading Code (2011) [1]. Corrugated metal panels are widely used as building envelop. In a previous study, laboratory tests have been carried out to investigate the performance of corrugated metal panels subjected to a 4kg wooden projectile by considering various impact locations, impact velocities and boundary conditions. In this study, numerical models were developed to simulate the responses of the corrugated metal panels subjected to wooden debris impacts by using commercial software LS-DYNA. The predicted data from the numerical simulations were compared with the experimental results. The validated numerical model can be used to conduct intensive numerical simulation to study the failure probabilities of corrugated structural panels subjected to windborne debris impacts.
Numerical Study of Dynamic Buckling of Steel Columns Subjected to Underground Explosion
Publisher: Trans Tech Publications, Ltd.
Date: 2003
Damage identification and optimal sensor placement for structures under unknown traffic-induced vibrations
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2017
Reliability analysis and design optimization of nonlinear structures
Publisher: Elsevier BV
Date: 06-2020
Derivation of 3D masonry properties using numerical homogenization technique
Publisher: Wiley
Date: 11-06-2006
DOI: 10.1002/NME.1537
Passive vibration control of engineering structures based on an innovative column-in-column (CIC) concept
Publisher: Elsevier BV
Date: 09-2021
Mitigation of heave response of semi-submersible platform (SSP) using tuned heave plate inerter (THPI)
Publisher: Elsevier BV
Date: 12-2018
ANIMATION OF GROUND SURFACE 3D MOVEMENTS DURING AN EARTHQUAKE
Publisher: Civil-Comp Press
Date: 1993
DOI: 10.4203/CCP.18.15.3
Numerical study on the flexural performance of precast segmental concrete beams with unbonded internal steel tendons
Publisher: Elsevier BV
Date: 07-2020
Numerical analysis of prestressed reinforced concrete beam subjected to blast loading
Publisher: Elsevier BV
Date: 2015
Review of Concrete Structures Strengthened with FRP Against Impact Loading
Publisher: Elsevier BV
Date: 08-2016
Dynamic response analysis of rock mass with stochastic properties subjected to explosive loads
Publisher: Informa UK Limited
Date: 1999
Non-probabilistic method to consider uncertainties in structural damage identification based on Hybrid Jaya and Tree Seeds Algorithm
Publisher: Elsevier BV
Date: 10-2020
Pounding Damage to Buildings and Bridges in the 22 February 2011 Christchurch Earthquake
Publisher: SAGE Publications
Date: 06-2012
DOI: 10.1260/2041-4196.3.2.123
Abstract: This paper addresses the damage to buildings and bridges resulting from relative movements between adjacent structures observed by the authors from building inspections and in-the-field investigations in Christchurch and surroundings carried out two weeks after the devastating earthquake of 22 February 2011. Relative structural response is often initiated by the different dynamic characteristic of the participating structures. Pounding induced damage might occur when the closing relative response is larger than the gap between adjacent structures. In the Central Business District (CBD) of Christchurch City many adjacent buildings have inadequate gaps between them or in many cases even no gap. Consequently, a large number of buildings, already weakened by the previous main shock of 4 September 2010 and its several thousand aftershocks, suffered further damage due to the strong February aftershock. The reoccurrence of excessive soil liquefaction caused particularly heavy damage to bridge sites along Avon River as the spatially varying ground movements induced large relative movement of the ground surface.
Stochastic seismic response analysis of buried onshore and offshore pipelines
Publisher: Elsevier BV
Date: 03-2017
Numerical study of precast segmental column under blast loads
Publisher: Elsevier BV
Date: 03-2017
Torsional response of building structures to spatial random ground excitations
Publisher: Elsevier BV
Date: 02-1997
Experimental Tests of Steel Fibre Reinforced Concrete Beams under Drop-Weight Impacts
Publisher: Trans Tech Publications, Ltd.
Date: 08-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.626.311
Abstract: Concrete is a brittle material, especially under tension. Intensive researches have been reported to add various types of fibres into concrete mix to increase its ductility. Recently, the authors proposed a new type of steel fibre with spiral shape to reinforce concrete material. Laboratory tests on concrete cylinder specimens demonstrated that compared to other fibre types such as the hooked-end, deformed and corrugated fibres the new fibres have larger displacement capacity and provide better bonding with the concrete. This study performs drop-weight impact tests to investigate the behaviour of concrete beams reinforced by different types of steel fibres. The quasi-static compressive and split tensile tests were also conducted to obtain the static properties of plain concrete and steel fibre reinforced concrete (FRC) materials. The quasi-static tests were carried out using hydraulic testing machine and the impact tests were conducted using an instrumented drop-weight testing system. Plain concrete and concrete reinforced by the commonly used hooked-end steel fibres and the proposed spiral-shaped steel fibres were tested in this study. The volume dosage of 1% fibre was used to prepare all FRC specimens. Repeated drop-weight impacts were applied to the beam specimens until total collapse. A 15.2 kg hard steel was used as the drop-weight impactor. A drop height of 0.5 m was considered in performing the impact tests. The force-displacement relations and the energy absorption capabilities of plain concrete and FRC beams were obtained, compared and discussed. The advantage and effectiveness of the newly proposed spiral-shaped steel fibres in increasing the performance of FRC beam elements under impact loads were examined.
Lateral behaviour of modular steel building with simplified models of new inter-module connections
Publisher: Elsevier BV
Date: 06-2021
Dynamic response of monolithic and precast concrete joint with wet connections under impact loads
Publisher: Elsevier BV
Date: 2022
An investigation of impact resistance capacity of polypropylene (PP) added plasterboard subjected to soft-body impact
Publisher: Elsevier BV
Date: 11-2021
Design Earthquake Ground Motion Prediction for Perth Metropolitan Area with Microtremor Measurements for Site Characterization
Publisher: Informa UK Limited
Date: 30-09-2009
Statistical Properties of the Bukit Timah Granite in Singapore
Publisher: ASTM International
Date: 2000
DOI: 10.1520/JTE12072J
Development and application of random forest technique for element level structural damage quantification
Publisher: Hindawi Limited
Date: 06-12-2021
DOI: 10.1002/STC.2678
Experimental Investigation on Monolithic Tempered Glass Window Responses to Blast Loads
Publisher: SAGE Publications
Date: 06-2015
DOI: 10.1260/2041-4196.6.2.287
Abstract: Monolithic glass is one of the most commonly and widely used materials for structural glazing in buildings. Due to its relatively low strength and brittle nature, monolithic glass window is often the most fragile part of a structure when subjected to air blast wave. The breakage of glass window under explosion always leads to enormous injuries and fatalities as a result of ejecting glass sharps flying at high speed towards people in the occupied area. For better protection of building occupants, it is necessary to fully understand monolithic glass responses under blast pressure. In this study, a series of full-scale field blasting tests were carried out to investigate monolithic glass window responses to blast loads. Typical windows with tempered glass panels and steel strip boundaries were mounted onto a reinforced concrete (RC) frame purposely constructed to support the window specimens for the tests. TNT explosives of different weights were detonated at different stand-off distances in front of the window. Window responses were monitored with high-speed cameras and linear variable displacement transducer (LVDT). Pressure sensors were used to measure the reflected pressure. Glass window failure patterns and associated glass fragments were recorded and analyzed. The tested window performances were compared with the predicted results based on ASTM and UFC standards, as well as previous testing results. Based on the testing data, criteria for tempered glass crack and fracture under blast loadings were formulated.
Transient dynamic fracture analysis using scaled boundary finite element method: a frequency-domain approach
Publisher: Elsevier BV
Date: 03-2007
Modelling of guided wave propagation with spectral element: Application in structural engineering
Publisher: Trans Tech Publications, Ltd.
Date: 05-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.553.687
Abstract: Among many structural health monitoring (SHM) methods, guided wave (GW) based method has been found as an effective and efficient way to detect incipient damages. In comparison with other widely used SHM methods, it can propagate in a relatively long range and be sensitive to small damages. Proper use of this technique requires good knowledge of the effects of damage on the wave characteristics. This needs accurate and computationally efficient modeling of guide wave propagation in structures. A number of different numerical computational techniques have been developed for the analysis of wave propagation in a structure. Among them, Spectral Element Method (SEM) has been proposed as an efficient simulation technique. This paper will focus on the application of GW method and SEM in structural health monitoring. The GW experiments on several typical structures will be introduced first. Then, the modeling techniques by using SEM are discussed.
Performance of monolithic and dry joints with GFRP bolts reinforced with different fibres and GFRP bars under impact loading
Publisher: Elsevier BV
Date: 08-2021
Detection of minor damage in structures with guided wave signals and nonlinear oscillator
Publisher: Elsevier BV
Date: 07-2018
Acid resistance of goethite in nickel laterite ore from Western Australia. Part I. the relationship between goethite morphologies and acid leaching performance
Publisher: Elsevier BV
Date: 11-2013
Vibration signal denoising for structural health monitoring by residual convolutional neural networks
Publisher: Elsevier BV
Date: 06-2020
Lost data recovery for structural health monitoring based on convolutional neural networks
Publisher: Hindawi Limited
Date: 08-08-2019
DOI: 10.1002/STC.2433
Blast mitigation performance of cladding using square dome-shape kirigami folded structure as core
Publisher: Elsevier BV
Date: 09-2018
Hysteretic behaviours of a novel lead-viscoelastic coupling beam damper: Numerical analysis and Bouc-Wen based model
Publisher: Elsevier BV
Date: 11-2023
Effect of grounded blast furnace slag and rice husk ash on performance of ultra-high-performance concrete (UHPC) subjected to impact loading
Publisher: Elsevier BV
Date: 04-2022
Ground motion modeling for multiple-input structural analysis
Publisher: Elsevier BV
Date: 05-1991
Effects of random variations of soil properties on site amplification of seismic ground motions
Publisher: Elsevier BV
Date: 09-2002
Numerical analysis of axial load effects on RC bridge columns under blast loading
Publisher: SAGE Publications
Date: 13-12-2020
Abstract: Blast load and its effects on transportation infrastructure especially bridge structures have received considerable attention in recent years. The RC bridge columns are considered as the most critical structural members because their failure leads to collapse of the bridge. Although RC bridge columns are typical axial load-carrying components, the studies on blast-resistant capacity of RC bridge columns usually neglect the axial load effect since it is commonly assumed that neglecting the axial load leads to conservative predictions of column responses. This assumption is true when column failure is governed by flexural response since axial compressive load generates a prestress in column which compensates concrete tensile stress induced by bending response. When subjected to blast loads, column response however could be governed by shear response. In this case neglecting axial loading effect does not necessarily lead to conservative predictions of column responses. In this study, high-fidelity finite element (FE) models for both non-contact explosion and contact explosion were developed in LS-DYNA. The FE models were validated with field blast test data. Subsequently, intensive simulations of the RC bridge columns with and without axial load subjected to a wider range of blast loading scenarios, including far-field, near-field and contact explosion were conducted. The influence of axial load on the dynamic performance of RC bridge columns corresponding to different blast loading scenarios was discussed.
Numerical prediction of rock mass damage due to accidental explosions in an underground ammunition storage chamber
Publisher: Springer Science and Business Media LLC
Date: 03-2006
Numerical simulation of structural responses on a sand layer to blast induced ground excitations
Publisher: Elsevier BV
Date: 04-2004
Damage identification of slab-girder structures: experimental studies
Publisher: Springer Science and Business Media LLC
Date: 25-01-2013
Performance of composite structural insulated panel with metal skin subjected to blast loading
Publisher: Elsevier BV
Date: 11-2015
Shake-table tests of BFRP-reinforced geopolymer concrete segmental columns (Sep, 10.1007/s10518-022-01486-w, 2022)
Publisher: Springer Science and Business Media LLC
Date: 09-09-2022
Experimental study on the behavior of precast segmental column with domed shear key and unbonded Post-Tensioning tendon under impact loading
Publisher: Elsevier BV
Date: 10-2018
Experimental study of concrete damage under high hydrostatic pressure
Publisher: Elsevier BV
Date: 10-2017
Spectral Element Modelling of Wave Propagation with Boundary and Structural Discontinuity Reflections
Publisher: SAGE Publications
Date: 05-2012
DOI: 10.1260/1369-4332.15.5.855
Abstract: Spectral element method is very efficient in modelling high-frequency stress wave propagation because it works in the frequency domain. It does not need to use very fine meshes in order to capture high frequency wave energy as the time domain methods do, such as finite element method. However, the conventional spectral element method requires a throw-off element to be added to the structural boundaries to act as a conduit for energy to transmit out of the system. This makes the method difficult to model wave reflection at boundaries. To overcome this limitation, imaginary spectral elements are proposed in this study, which are combined with the real structural elements to model wave reflections at structural boundaries. The efficiency and accuracy of this proposed approach is verified by comparing the numerical simulation results with measured results of one dimensional stress wave propagation in a steel bar. The method is also applied to model wave propagation in a steel bar with not only boundary reflection, but also reflections from single and multiple cracks. The reflection and transmission coefficients, which are obtained from the discrete spring model, are adopted to quantify the discontinuities. Experimental tests of wave propagation in a steel bar with one crack of different depths are also carried out. Numerical simulations and experimental results show that the proposed method is effective and reliable in modelling wave propagation in one-dimensional waveguides with reflections from boundary and structural discontinuities. The proposed method can be applied to effectively model stress wave propagation for structural damage detection.
Dynamic tensile behaviour of fibre reinforced concrete with spiral fibres
Publisher: Elsevier BV
Date: 12-2012
Structural behavior and vibration characteristics of geopolymer composite lightweight sandwich panels for prefabricated buildings
Publisher: Elsevier BV
Date: 10-2022
Review of bolted inter-module connections in modular steel buildings
Publisher: Elsevier BV
Date: 05-2019
Structural performance evaluation of UHPC/conventional concrete cast on new Y-shape FRP stay-in-place formwork for concrete bridge decks
Publisher: Elsevier BV
Date: 07-2022
Discussion on the suitability of concrete constitutive models for high-rate response predictions of RC structures
Publisher: Elsevier BV
Date: 08-2017
Strength reduction factor for MDOF soil-structure systems
Publisher: Wiley
Date: 29-05-2014
DOI: 10.1002/TAL.1022
Seismic design of bridge structures with allowance for large relative girder movements to avoid pounding
Publisher: New Zealand Society for Earthquake Engineering
Date: 30-06-2009
DOI: 10.5459/BNZSEE.42.2.75-85
Abstract: Pounding between bridge girders have been observed in almost all previous major earthquakes. This is because the gap size of conventional bridge expansion joint is usually only a few centimetres, which is not sufficient to preclude poundings owing to large relative displacements between bridge girders caused by the effect of varying vibration properties of adjacent bridge spans, varying ground motions at bridge supports and varying soil-structure interaction (SSI). In this work a new design of bridge expansion joint is introduced. Instead of tolerating pounding and providing possible mitigating measures, this new design approach enables large movement between bridge girders which makes a complete pounding preclusion possible. The new expansion joint is called Modular Expansion Joint (MEJ). The large movability is achieved by installing a number of small gaps in the joint. In this study, the MEJ gap size required to completely avoid girder pounding is investigated. The most significant influence factors – the varying vibration properties of adjacent bridge spans, the effect of SSI and ground motion spatial variation on expansion joint size required to preclude pounding- are calculated. Discussions on the relative importance of various structural and ground motion properties in generating relative displacements of adjacent bridge girders are made.
Medium- and High-Frequency Vibration Characteristics of a Box-Girder by the Waveguide Finite Element Method
Publisher: World Scientific Pub Co Pte Lt
Date: 22-10-2018
DOI: 10.1142/S0219455418501419
Abstract: An approach to predicting the vibration responses of a bridge and analyzing the wave propagation characteristics along the bridge is proposed based on the waveguide finite element (WFE) method. For verification, a field vibration test was performed on a 30[Formula: see text]m-long simply supported box-girder on the fourth line of Guangzhou Metro in China. The numerical results were shown to agree well with the test results, demonstrating the accuracy of the proposed approach. The advantages of the WFE approach are discussed by comparing the WFE with finite element (FE) analyses. The dispersion characteristics and mode shapes of waves propagating in the box-girder are calculated by using the WFE method, from which the dominant wave modes corresponding to the peaks of the medium- and high-frequency train-induced vibrations are identified. A vibration reduction measure is considered. Both the test and numerical results show that the medium- and high-frequency vibrations of the box-girder are predominately in the 1/3 octave center frequency range of 63–100[Formula: see text]Hz with maximum occurring at the center frequency of 80[Formula: see text]Hz. The WFE method has higher computational efficiency and requires smaller storage space than the FE counterpart, but provides similar predictions as the latter. In total, there are 14 wave modes propagating in the box-girder below 200[Formula: see text]Hz. The G1, A1 and D2 wave modes are the dominant wave modes generating vibration velocity peaks on the top, bottom and flange slabs, respectively. Adding a middle web slab to the center of the cross-section is an effective way to mitigate the vibration of the box-girder bridge.
Development of efficient methods for prediction of medium to large scale BLEVE pressure in open space
Publisher: Elsevier BV
Date: 05-2022
Estimation of required separations between adjacent structures under spatial ground motions
Publisher: Informa UK Limited
Date: 04-1998
Laboratory tests and numerical simulations of CFRP strengthened RC pier subjected to barge impact load
Publisher: World Scientific Pub Co Pte Ltd
Date: 03-02-2015
DOI: 10.1142/S0219455414500370
Abstract: Bridge piers are designed to withstand not only axial loads of superstructures and passing vehicles but also out-of-plane loads such as earthquake excitations and vessel impact loads. Vessel impact on bridge piers can lead to substantial damages or even collapse of bridge structures. An increasing number of vessel collision accidents have been reported in the past decade. A lot of researches have been conducted for predicting barge impact loads and calculating structural responses. However, in practice it is not possible to design bridge structures to resist all levels of barge impact loads. Moreover, with an increasing traffic volume and vessel payload in some waterways, the bridge piers designed according to previous specifications might not be sufficient to resist the current vessel impact loads. Therefore, strengthening existing bridge piers are sometimes necessary for protecting structures from barge impact. Carbon fiber reinforced polymer (CFRP) has been widely used in strengthening reinforced concrete structures under impulsive loadings. It is an effective material which has been proven to be able to increase the flexural strength of structures. In this study, CFRP composites are used to strengthen reinforced concrete piers against barge impact loads. Pendulum impact tests are conducted on scaled pier models. Impact force and pier response with and without CFRP strengthening are compared. The effectiveness of using CFRP strengthening the pier model is observed. In addition, numerical models of the bridge piers are developed and calibrated with experimental results. Parametric simulations of barge impacting on piers with or without CFRP strengthening are carried out. The results show that compared with unstrengthened pier, CFRP composite strengthened bridge pier has a higher impact resistance capacity and hence endures less structural damage under the same barge impact load. The effectiveness of CFRP strengthening with different CFRP thickness, CFRP strength and bond strength between the pier and the CFRP composite are also discussed.
Numerical simulation on the effectiveness of using viscoelastic materials to mitigate seismic induced vibrations of above-ground pipelines
Publisher: Elsevier BV
Date: 09-2016
Interfacial bond behaviour between hybrid carbon/basalt fibre composites and concrete under dynamic loading
Publisher: Elsevier BV
Date: 06-2020
Numerical analysis of concrete material properties at high strain rate under direct tension
Publisher: Elsevier BV
Date: 2012
Development of a New Nonbuckling Segmented Brace
Publisher: World Scientific Pub Co Pte Lt
Date: 29-10-2015
DOI: 10.1142/S021945541540012X
Abstract: This paper introduces a new design of segmented nonbuckling brace member for use in frame structures to resist earthquake loading. The proposed segmented brace member consists of one or more segments connected by either tension-only or compressive force controlled joints. Because it cannot resist or can only resist a limited amount of compressive force, it is effective only under tension, but buckling would not be a failure mechanism of the brace. Its capability of mitigating seismic responses remains effective throughout the entire ground excitation duration. The other advantages of this new design include light weight, easy installation, easy replacement, controlled damage locations, and minimum or no residual structural deformation. The disadvantage is that full energy dissipations can be achieved only when it is in tension. Therefore they will be effective in a frame structure only when cross bracings are used. This paper presents experimental tests and numerical simulation results to examine the effectiveness of this innovative brace member in mitigating seismic responses of frame structures. Laboratory cyclic loading tests on a single brace member and on steel frames without bracing or with cross bracing by conventional brace or segmented brace are carried out. The testing results are analyzed and compared. The effectiveness of segmented brace members in mitigation of seismic loading effects on frame structures is demonstrated. Nonlinear response analyses are then carried out to investigate the performance of this new segmented brace applied to a steel frame structure subjected to ground motions of different litudes. The results demonstrate that this new design is effective in mitigating seismic loading effect throughout the entire ground motion duration.
Impact Response and Capacity of Precast Concrete Segmental versus Monolithic Bridge Columns
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2019
Numerical simulation of barge impact on a continuous girder bridge and bridge damage detection
Publisher: SAGE Publications
Date: 03-2013
Abstract: Vessel collisions on bridge piers have been frequently reported. As many bridges are vital in transportation networks and serve as lifelines, bridge damage might leads to catastrophic consequences to life and economy. Therefore it is of great importance to protect bridge structures, especially bridge piers, against vessel impacts. Many researches have been conducted to predict vessel impact loads on bridge piers, and to design bridge piers or additional protective structures to resist such impact loads. Studies on assessing the bridge conditions after a vessel impact are, however, very limited. Current practice basically uses visual inspections, which not only requires very experienced engineers to perform the inspection in order to obtain creditable assessment, but also is often very difficult to inspect the underwater pier conditions. Therefore it is necessary to develop methods to give efficient, quantitative and reliable assessment of bridge conditions under ambient conditions after a vessel impact. This study explores the feasibility of using vibration measurements to quickly detect bridge conditions after a vessel impact. The study consists of three parts. First, a detailed numerical model of an ex le bridge structure is developed to calculate the vibrations under ambient hydrodynamic force. Then the model is used to simulate vessel impact on bridge pier and predict the pier damage. The vibration response analysis of the damaged bridge model is performed again in the third step to simulate vibration responses of the damaged bridge under ambient conditions. Using the vibration data obtained before and after vessel impact, the bridge vibration parameters such as vibration frequencies and mode shapes are extracted by using the frequency domain decomposition method. The bridge condition will then be identified through the changes in bridge vibration parameters and compared with the damage observed in the impact simulation. It is found that this method is capable of estimating bridge damage condition after barge impact accident.
Experimental study of precast segmental columns with unbonded tendons under cyclic loading
Publisher: SAGE Publications
Date: 30-06-2018
Structural response recovery based on improved multi-scale principal component analysis considering sensor performance degradation
Publisher: SAGE Publications
Date: 26-07-2018
The influence of design parameters of engineered aggregate in metaconcrete on bandgap region
Publisher: Elsevier BV
Date: 06-2020
Numerical study of the compressive behavior of concrete material at high strain rate with active confinement
Publisher: SAGE Publications
Date: 04-04-2019
Damage Detection in Initially Nonlinear Structures Based on Variational Mode Decomposition
Publisher: World Scientific Pub Co Pte Lt
Date: 09-2020
DOI: 10.1142/S0219455420420092
Abstract: Nonlinear characteristics in the dynamic behaviors of civil structures degrade the performance of damage detection of the linear theory based traditional time- and frequency-domain methods. To overcome this challenge, this paper proposes a damage detection approach for nonlinear structures based on Variational Mode Decomposition (VMD). In this approach, the measured dynamic responses from nonlinear structures under earthquake excitations are adaptively decomposed into a finite number of monocomponents by using VMD. Each decomposed mono-component represents an litude modulated and frequency modulated (AMFM) signal with a limited frequency bandwidth. Hilbert transform is then employed to identify the instantaneous modal parameters of the decomposed monomodes, including instantaneous frequencies and mode shapes. Based on the identified modal parameters from the decomposed structural dynamic responses, two damage indices are defined to identify the location and severity of structural damage, respectively. To validate the effectiveness and accuracy of the proposed approach, a nonlinear seven-storey shear building model with four different damage cases under earthquake excitations is used in the numerical studies. In experimental verifications, data from shake table tests on a 12-storey scaled reinforced concrete frame structure with different earthquake excitations are analyzed with the proposed approach. The results in both numerical studies and experimental validations demonstrate that the proposed approach can be successfully applied for nonlinear structural damage identification.
Dynamic response of rubberized concrete columns with and without FRP confinement subjected to lateral impact
Publisher: Elsevier BV
Date: 10-2018
Sustainable High-Performance Resilient Structures
Publisher: Elsevier BV
Date: 04-2019
Physical and Mechanical Properties of New Lightweight Ambient-Cured EPS Geopolymer Composites
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2021
Bond behavior between basalt fibres reinforced polymer sheets and steel fibres reinforced concrete
Publisher: Elsevier BV
Date: 12-2018
Modelling of compressive behaviour of concrete-like materials at high strain rate
Publisher: Elsevier BV
Date: 08-2008
Crushing behaviour of corrugated tilted honeycomb core inspired by plant stem
Publisher: Elsevier BV
Date: 07-2023
An experimental and numerical study of reinforced ultra-high performance concrete slabs under blast loads
Publisher: Elsevier BV
Date: 10-2015
Analysis of seismic pounding between adjacent buildings
Publisher: Informa UK Limited
Date: 02-09-2015
High-resolution time-frequency representation for instantaneous frequency identification by adaptive Duffing oscillator
Publisher: Hindawi Limited
Date: 22-09-2020
DOI: 10.1002/STC.2635
In-plane crushing behaviors of hexagonal honeycombs with different Poisson's ratio induced by topological diversity
Publisher: Elsevier BV
Date: 02-2021
Micro-seismic event detection and location in underground mines by using Convolutional Neural Networks (CNN) and deep learning
Publisher: Elsevier BV
Date: 11-2018
Post-blast capacity of ultra-high performance concrete columns
Publisher: Elsevier BV
Date: 03-2017
Experimental and Numerical Study of Basalt FRP Strip Strengthened RC Slabs under Impact Loads
Publisher: World Scientific Pub Co Pte Lt
Date: 06-2020
DOI: 10.1142/S0219455420400015
Abstract: Basalt fiber-reinforced polymer (BFRP) has been applied for strengthening concrete structures. However, studies on reinforced concrete (RC) slabs strengthened by BFRP strips under impact loads are limited in open literature. This study investigates the efficiency of using BFRP strips with various strengthening layouts and anchoring schemes on the impact resistance of RC slabs. A total of 11 two-way square slabs were prepared and tested, including one reference specimen without strengthening and ten slabs strengthened with BFRP strips and/or anchors. The RC slabs were impacted by a drop weight with increasing height until slab failure. The observed failure modes include punching shear failure, BFRP sheet debonding and reinforcement fracture. The failure modes and the effects of using various strengthening schemes on the impact resistant capacity of RC slabs were examined. The quantitative measurements, such as impact velocity, indentation depth and diameter, were compared and discussed. In addition, numerical studies were carried out by using LS-DYNA to simulate the impact tests of RC slabs with and without BFRP strengthening. With the calibrated numerical model, the impact behavior of slabs with various dimensions and strengthening layouts under different impact intensities can be predicted with good accuracy.
Analysis of discontinuous bifurcations for elasto-plastic geomaterials with effect of damage
Publisher: Springer Science and Business Media LLC
Date: 03-2002
DOI: 10.1007/BF01171448
A unified characteristic theory for plastic plane stress and strain problems
Publisher: ASME International
Date: 09-2003
DOI: 10.1115/1.1602484
Abstract: Based on the unified strength criterion, a characteristic theory for solving the plastic plane stress and plane strain problems of an ideal rigid-plastic body is established in this paper, which can be adapted for a wide variety of materials. Through this new theory, a suitable characteristic method for material of interest can be obtained and the relations among different sorts of characteristic methods can be revealed. Those characteristic methods on the basis of different strength criteria, such as Tresca, von Mises, Mohr-Coulomb, twin shear (TS) and generalized twin shear (GTS), are the special cases (Tresca, Mohr-Coulomb, TS, and GTS) or linear approximation (von Mises) of the proposed theory. Moreover, a series of new characteristic methods can be easily derived from it. Using the proposed theory, the influence of yield criterion on the limit analysis is analyzed. Two ex les are given to illustrate the application of this theory.
Free water effect on the dynamic compressive properties of mortar
Publisher: Elsevier BV
Date: 04-2021
Failure analysis of corrugated panel subjected to windborne debris impacts
Publisher: Elsevier BV
Date: 09-2014
The mechanical properties of ionoplast interlayer material at high strain rates
Publisher: Elsevier BV
Date: 10-2015
STATE-OF-THE-ART REVIEW ON SEISMIC INDUCED POUNDING RESPONSE OF BRIDGE STRUCTURES
Publisher: World Scientific Pub Co Pte Lt
Date: 09-2013
DOI: 10.1142/S179343111350019X
Abstract: Seismic induced pounding damage to bridge structures was repeatedly observed in many previous major earthquakes. To avoid this adverse effect, extensive research efforts have been made by many researchers. This paper presents a state-of-the-art review in this field. It includes a brief review of the numerical modeling of bridge structures and impact models, numerical simulation of pounding responses between different components of bridge structures, experimental investigations, and pounding mitigation methods.
Investigation of Ultra-high Performance Concrete Under Static and Blast Loads
Publisher: SAGE Publications
Date: 06-2015
DOI: 10.1260/2041-4196.6.2.217
Abstract: Conventional concrete works as an important construction material. However, conventional concrete is known to be brittle and prone to tensile failure and cracks. To overcome such defects and improve the dynamic performance of concrete against extreme loading conditions, concrete with different additions and formulae have been developed. In a recent study, to develop ultra-high performance concrete (UHPC) material with better strength and crack control ability, super fine aggregates with high pozzolanic effect were mixed into the steel fibre reinforced concrete instead of the traditional graded coarse aggregates. Furthermore, to achieve high early age strength, nanoscale additives which can accelerate the hydration process of the ordinary Portland cement were also introduced into the concrete composite. A series of uniaxial compression and four-point bending tests had been performed in the laboratory to get the material properties of this innovative concrete material. Great improvement of the concrete uniaxial compressive strength and flexural tensile strength was observed. Field blast tests were carried out on columns made of this UHPC material. Superior blast resistance performance was observed. In the current study, based on the available test data, numerical models are developed and numerical simulations are carried out. The simulation results are found to comply well with the experimental results.
Long-term monitoring of vibration properties of structures with different materials and boundary conditions
Publisher: CRC Press
Date: 26-11-2012
DOI: 10.1201/B15320-161
Numerical simulation of a cable-stayed bridge response to blast loads, Part I: Model development and response calculations
Publisher: Elsevier BV
Date: 10-2010
Model for analytical investigation on meta-lattice truss for low-frequency spatial wave manipulation
Publisher: Elsevier BV
Date: 06-2021
Numerical simulation of a cable-stayed bridge response to blast loads, Part II: Damage prediction and FRP strengthening
Publisher: Elsevier BV
Date: 10-2010
Experimental and numerical studies of the shear resistance capacities of interlocking blocks
Publisher: Elsevier BV
Date: 12-2202
Multi-scale stochastic dynamic response analysis of offshore risers with lognormal uncertainties
Publisher: Elsevier BV
Date: 10-2019
Experimental and three-dimensional finite element method studies on pounding responses of bridge structures subjected to spatially varying ground motions
Publisher: SAGE Publications
Date: 28-07-2017
Abstract: Pounding and unseating damages to bridge superstructures have been commonly observed in many previous major earthquakes. These damages can essentially attribute to the large closing or opening relative displacement between adjacent structures. This article carries out an experimental study on the pounding responses of adjacent bridge structures considering spatially varying ground motions using a shaking table array system. Two sets of large-scale (1:6) bridge models involving two bridge frames were constructed. The bridge models were subjected to the stochastically simulated ground motions in bi-direction based on the response spectra of Chinese Guideline for Seismic Design of Highway Bridge for three different site conditions, considering three coherency levels. Two types of boundary conditions, that is, the fixed foundation and rocking foundation, were applied to investigate the influence of the foundation type. In addition, a detailed three-dimensional finite element model was constructed to simulate an experimental case. The nonlinear material behavior including strain rate effects of concrete and steel reinforcement is included. The applicability and accuracy of the finite element model in simulating bridge pounding responses subjected to spatially varying ground motions are discussed. The experimental and numerical results demonstrate that non-uniform excitations and foundation rocking can affect the relative displacements and pounding responses significantly.
Guest Editorial
Publisher: SAGE Publications
Date: 02-2006
Development of a novel deformation-amplified shape memory alloy-friction damper for mitigating seismic responses of RC frame buildings
Publisher: Elsevier BV
Date: 08-2020
Investigation on the lateral impact responses of circular concrete-filled double-tube (CFDT) members
Publisher: Elsevier BV
Date: 2021
Specimen shape and size effects on the concrete compressive strength under static and dynamic tests
Publisher: Elsevier BV
Date: 02-2018
Dynamic crushing characteristics of bio-inspired minimal surface primitive structures
Publisher: Elsevier BV
Date: 2023
DAMAGE DETECTION OF RC SLABS USING NONLINEAR VIBRATION FEATURES
Publisher: World Scientific Pub Co Pte Lt
Date: 12-2009
DOI: 10.1142/S0219455409003247
Abstract: Studied herein are the signatures of nonlinear vibration characteristics of damaged reinforced concrete structures using the wavelet transform (WT). A two-span RC slab built in 2003 was tested to failure in the laboratory. Vibration measurements were carried out at various stages of structural damage. The vibration frequencies, mode shapes, and d ing ratios at each loading stage were extracted and analyzed. It is found that the vibration frequencies are not sensitive to small damages, but are good indicators when damage is severe. The dynamic responses are also analyzed in the time–frequency domain by WT and the skeleton curve is constructed to describe the nonlinear characteristics in the reinforced concrete structures. The results show that the skeleton curves are good indicators of damage in the reinforced concrete structures because they are more sensitive to small damages than vibration frequencies.
Stress sensitivity of gypsum dehydration kinetics at constant uniaxial stress under dry conditions
Publisher: Copernicus GmbH
Date: 15-05-2023
DOI: 10.5194/EGUSPHERE-EGU23-9856
Abstract: We recently showed that the dehydration of alabaster, natural gypsum rock with randomly oriented grains, can be accelerated by a factor of two through the application of an elastic differential pre-stress of ~ 5 MPa applied via a uniaxial constant-displacement boundary condition (0.1038/s43246-021-00156-9). Here, we present a novel series of gypsum dehydration experiments using a new in-situ experimental cell monitored with fast synchrotron transmission small- and wide-angle X-ray scattering (SAXS/WAXS) to investigate if an acceleration of the kinetics also occurs at constant uniaxial stress. Prior to stressing and heating, the loaded s le chamber was flushed with nitrogen to remove atmospheric moisture and finally locked, filled with the nitrogen atmosphere pressurised to 1 bar. Six increasing uniaxial stresses in the interval [0 ] MPa were studied at a dehydration temperature of 142& #730 C. A strongly nonlinear acceleration of dehydration rate is observed over the studied stress interval. At 10 MPa, the reductions of induction and characteristic time amount to ~60% and ~50%, respectively. 2D SAXS patterns generally evolve from isotropic to highly anisotropic shapes, indicating preferential growth of nano-scatterers. Post-mortem scanning-electron imaging reveals that the phase transformation occurs via pseudomorph replacement. These results are largely consistent with our previous experiments and support the notion that tectonic stresses affect mineral transformation kinetics.
Evaluation of dynamic vehicle axle loads on bridges with different surface conditions
Publisher: Elsevier BV
Date: 06-2009
Performance of Bridges Isolated with Sliding-Lead Rubber Bearings Subjected to Near-Fault Earthquakes
Publisher: World Scientific Pub Co Pte Lt
Date: 13-01-2020
DOI: 10.1142/S0219455420500236
Abstract: This paper investigates the seismic performance of bridges installed with a sliding-lead rubber bearing (LRB) isolation system subjected to near-fault earthquakes. A three-span continuous bridge isolated with sliding-LRB system is used as an ex le. Nonlinear time history analyses are conducted to investigate the sensitivity effects of isolation period, friction coefficient and sliding displacement limit on the bridge responses. The responses of the sliding-LRB system are compared with those of the conventional LRB system. The results show that the base forces of the piers can be reduced by employing proper friction coefficients. However, the residual displacement of the sliding-LRB system may be larger compared with that of the conventional LRB system. To overcome this disadvantage, an improved solution to reduce the residual displacement is proposed with its effectiveness investigated. It was also demonstrated that the residual displacement and peak displacement can be effectively reduced by employing the shape memory alloy devices in the sliding-LRB system without significantly increasing the base forces.
Numerical simulations of stiffened multi-arch double-layered panels subjected to blast loading
Publisher: SAGE Publications
Date: 06-2013
DOI: 10.1260/2041-4196.4.2.163
Abstract: Blast-resistant structures are traditionally designed and fabricated with solid materials of heavy weight to resist blast loadings. This not only increases the material and construction costs, but also undermines the operational performance of protective structures. To overcome these problems, new designs with either new structural forms or new materials are demanded against blast loads. A multi-arch double-layered panel has been proposed as a new structural form in a previous study [1]. Its performance has been numerically demonstrated better than other forms of double-layered panels in resisting blast loads. In this study, to further improve the effectiveness of the multi-arch double-layered panel in resisting blast loads, responses of a five-arch double-layered panel with rectangular stiffeners to detonations are investigated by using finite element code Ls-Dyna. The numerical results show that the stiffened panel outperforms the unstiffened panel of the same weight in terms of the blast-resistant capacity and energy absorption capacity. Parametric studies are conducted to investigate the effects of various stiffener configurations, boundary conditions, stiffener dimension, strain rate sensitivity and blast intensity on the dynamic response to blast loadings. The central point displacements, internal energy absorptions, boundary reaction forces and plastic strains are compared and the optimal configurations of blast-resistant panel are determined. It demonstrates that the strategic arrangement of stiffeners with appropriate boundary conditions can maximize the reduction of dynamic response of the panels to blast loadings. The stiffened multi-arch dotuble-layered panels have great application potentials in the blast-resistant panel design.
Distributed Structural Damage Generated by High-Frequency Ground Motion
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2002
Self-assembled carbon dot-wrapped perovskites enable light trapping and defect passivation for efficient and stable perovskite solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA00036E
Abstract: A strategy to utilize carbon dots for simultaneously improving photovoltaic performance and longevity of metal halide perovskite solar cells.
Health monitoring of joint conditions in steel truss bridges with relative displacement sensors
Publisher: Elsevier BV
Date: 06-2016
Mechanical behaviors of 3D re-entrant honeycomb polyamide structure under compression
Publisher: Elsevier BV
Date: 09-2020
Preface: A special issue on protection of structures against hazards
Publisher: SAGE Publications
Date: 06-2015
Modeling of simultaneous ground shock and airblast pressure on nearby structures from surface explosions
Publisher: Elsevier BV
Date: 07-2005
Damage prediction of RC columns with various levels of corrosion deteriorations subjected to blast loading
Publisher: Elsevier BV
Date: 12-2023
Data driven structural damage assessment using phase space embedding and Koopman operator under stochastic excitations
Publisher: Elsevier BV
Date: 03-2022
Textured pipe-in-pipe system: A compound passive technique for vortex-induced vibration control
Publisher: Elsevier BV
Date: 02-2020
Simultaneous identification of structural damage and nonlinear hysteresis parameters by an evolutionary algorithm-based artificial neural network
Publisher: Elsevier BV
Date: 06-2022
Effect of CFRP strengthening properties with anchoring systems on P-I diagrams of RC panels under blast loads
Publisher: Elsevier BV
Date: 03-2019
Sensitivity of lateral impact response of RC columns reinforced with GFRP bars and stirrups to concrete strength and reinforcement ratio
Publisher: Elsevier BV
Date: 09-2021
Application of deep autoencoder model for structural condition monitoring
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2018
Numerical prediction of reinforced concrete exterior wall response to blast loading
Publisher: SAGE Publications
Date: 08-2008
DOI: 10.1260/136943308785836826
Abstract: It is of interest to know the response of the unretrofitted reinforced concrete exterior walls under blast loading because some infrastructures might be targets of terrorist attack. Detailed numerical simulation and analysis of a typical concrete wall under different blast loads is presented in this study. The concrete material model used in the study includes a dynamic plastic damage model, a modified damage dependent piece-wise Drucker-Prager strength envelope, and a nonlinear equation of state considering the heterogeneity and porosity of concrete materials. The strain rate effect on tensile and compressive strength is considered separately. The concrete damage is based on Mazars' damage model, which combines tensile and compressive damage. The present numerical model was calibrated first by comparing the numerical results with laboratory blast test results of reinforced concrete slabs. The calibrated model is then employed to simulate the response of a typical reinforced concrete exterior wall under blast loads. TNT charge weights corresponding to some typical terrorist bombs, that is, from 10kg to 5000kg, are considered. In terms of different TNT charge weights, the responses of the reinforced concrete wall at different stand-off distances are simulated. Based on the numerical results, critical curves that relate damage levels with the explosion conditions are derived. The safe stand-off distances to resist different terrorist bombing scenarios are suggested.
Simulation of multi-support depth-varying earthquake ground motions within heterogeneous onshore and offshore sites
Publisher: Springer Science and Business Media LLC
Date: 07-2018
Interfacial debonding detection in externally bonded bfrp reinforced concrete using stress wave-based sensing approach
Publisher: IOP Publishing
Date: 19-02-2020
Building Pounding Damages Observed during the 2015 Gorkha Earthquake
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2018
On the accuracy, reliability and controllability of impact tests of RC beams
Publisher: Elsevier BV
Date: 11-2021
Identification of gradually varying physical parameters based on discrete cosine transform using partial measurements
Publisher: Hindawi Limited
Date: 09-10-2022
DOI: 10.1002/STC.3111
Development of P-I diagrams for FRP strengthened RC columns
Publisher: Elsevier BV
Date: 05-2011
Experimental study of dynamic post-buckling characteristics of columns under fluid-solid slamming
Publisher: Elsevier BV
Date: 06-2000
Three-dimensional vortex-induced vibration of a circular cylinder at subcritical Reynolds numbers with low-Re correction
Publisher: Elsevier BV
Date: 07-2019
Experimental and analytical study on structural performance of reinforced lightweight geopolymer composites panels
Publisher: Elsevier BV
Date: 05-2023
An Improved SSI Approach for Structural Modal Identification
Publisher: Springer Singapore
Date: 04-09-2020
Experimental study of flexural behaviour of RC beams strengthened by longitudinal and U-shaped basalt FRP sheet
Publisher: Elsevier BV
Date: 02-2018
Reliability based design optimization of bridges considering bridge-vehicle interaction by Kriging surrogate model
Publisher: Elsevier BV
Date: 11-2021
Target-free vision-based technique for vibration measurements of structures subjected to out-of-plane movements
Publisher: Elsevier BV
Date: 07-2019
Multi-Sided Pounding Response of Bridge Structures with Non-Linear Bearings to Spatially Varying Ground Excitation
Publisher: SAGE Publications
Date: 02-2006
DOI: 10.1260/136943306776232936
Abstract: Considerable research of pounding effect on adjacent structures has been conducted in the past. However, most of them neglected the effect of multi-sided poundings. In bridges multiple adjacent bridge structures are common. Consequently, restraint due to additional neighbouring bridge structures cannot be avoided. This study addresses the effect of multi-sided pounding on structural responses due to spatially varying ground movements. Additional effect of non-linear bearing supports of the girders is also considered. The ground motions were simulated stochastically according to the Newmark-Hall spectrum. The result shows that in order to estimate the pounding and bearing forces as well as unseating potential of the girders realistically a consideration of non-uniform ground motions, end-restraint effect and non-linear girder bearings is necessary.
Experimental investigation on dynamic properties of ultra-high-performance rubberized concrete (UHPRuC)
Publisher: Elsevier BV
Date: 11-2021
Pull-out behaviour of spiral-shaped steel fibres from normal-strength concrete matrix
Publisher: Elsevier BV
Date: 05-2017
Comparative performance analysis of ground slabs and beams reinforced with macro polypropylene fibre, steel fibre, and steel mesh
Publisher: Elsevier BV
Date: 10-2023
Dynamic response of steel-reinforced concrete-filled circular steel tubular members under lateral impact loads
Publisher: Elsevier BV
Date: 06-2020
Mesoscale modelling and analysis of damage and fragmentation of concrete slab under contact detonation
Publisher: Elsevier BV
Date: 12-2009
In Situ Data Analysis for Condition Assessment of an Existing Prestressed Concrete Bridge
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-2018
Analysis of coupled lateral-torsional-pounding responses of one-storey asymmetric adjacent structures subjected to bi-directional ground motions part I: Uniform ground motion input
Publisher: SAGE Publications
Date: 10-2005
DOI: 10.1260/136943305774858043
Abstract: This paper presents results of a parametric study of seismic induced lateral-torsional-pounding responses of an asymmetric and a symmetric one-storey system subjected to bi-directional ground motion. The properties of the symmetric model are fixed, while the vibration frequency and eccentricity of the asymmetric model vary in the numerical computation. 20 sets of bi-directional horizontal earthquake ground motion time histories are numerically simulated for the analysis. All the simulated motions are compatible in idually with the Newmark-Hall design response spectrum with 5% d ing and normalized to 0.5g. Ensemble mean peak responses of the two systems to the 20 sets ground motions are estimated. Both linear elastic and nonlinear inelastic behaviours are studied. Effects of torsional stiffness, structural vibration frequency, eccentricities, and initial gap between two structures are investigated. Numerical results are presented in dimensionless form and compared with the code torsional provisions. In this paper, the input ground motion time histories at all the structural supports are assumed to be uniform. An accompany paper of this study is devoted to discuss the effect of the spatially varying ground motion on coupled lateral-torsional-pounding responses of the adjacent structures (Hao and Gong 2005).
Quantitative analysis of turbostratically disordered nontronite with a supercell model calibrated by the PONKCS method
Publisher: International Union of Crystallography (IUCr)
Date: 15-11-2012
DOI: 10.1107/S0021889812040484
Abstract: Two calibration-based quantitative X-ray diffraction (XRD) models for turbostratically disordered Bulong nontronite, the PONKCS (partial or no known crystal structure) approach and the supercell structural model, were compared in terms of the accuracy and refinement error from Rietveld quantitative phase analysis. The PONKCS approach achieved improved nontronite quantitative results with synchrotron diffraction patterns compared with those achieved with laboratory XRD data as a result of better data quality and the use of Debye–Scherrer geometry with significantly reduced preferred orientation effects. The introduction of a peak shape modifier (spherical harmonics) to correct the quantification result is mainly useful for laboratory XRD patterns containing nontronite collected from Bragg–Brentano geometry with appreciable preferred orientation effects. A novel calibration approach for the nontronite supercell model was developed, based on the Rietveld quantitative formula in the TOPAS symbolic computation system. The calibrated supercell model achieved better accuracy (deviation within 1 wt%) and lower refinement error than the PONKCS approach because the physically based description of turbostratic disorder requires fewer refinable parameters than the PONKCS approach. The drawbacks and limitations of the supercell approach are also discussed.
Effect of porosity on the properties of strain localization in porous media under undrained conditions
Publisher: Elsevier BV
Date: 04-2002
Crushing behaviours of folded kirigami structure with square dome shape
Publisher: Elsevier BV
Date: 05-2018
Quasi-static and dynamic tensile properties of fiberglass/epoxy laminate sheet
Publisher: Elsevier BV
Date: 07-2017
Stochastic dynamic analysis of marine risers considering Gaussian system uncertainties
Publisher: Elsevier BV
Date: 03-2018
The response of precast concrete segmental columns subjected to near base impact
Publisher: SAGE Publications
Date: 22-02-2019
Abstract: Precast concrete segmental column has attracted many attentions for the past decades due to its unique features especially in improving the construction quality and efficiency. However, the performance of precast segmental column under lateral impact loading has been less studied. Our previous studies performed laboratory pendulum impact tests on scaled segmental columns to investigate their behaviours when impacted at mid-span of the column. This article studies the response of segmental column when impacted near the column base, which generates different response modes and failure mechanisms compared to the columns subjected to the mid-span impact. Lateral impacts are applied either to segmental joint between the two bottom segments or directly onto the centre of the base concrete segment. A detailed three-dimensional numerical model is created and validated with laboratory impact testing results on scaled segmental columns. A full-scale 3-m tall segmental column is then numerically built to study the behaviour under near base impact. The column damage and failure modes are analysed. The influences of prestress level in the post-tensioning tendon and concrete strength on the performance of segmental column subjected to near base impacts are investigated through numerical simulations.
Numerical and analytical prediction of pressure and impulse from vented gas explosion in large cylindrical tanks
Publisher: Elsevier BV
Date: 07-2019
Mesh size effect in numerical simulation of blast wave propagation and interaction with structures
Publisher: Springer Science and Business Media LLC
Date: 29-10-2008
Influence of infilled masonry wall on vibration properties and dynamic responses of building structures to earthquake ground excitations
Publisher: CRC Press
Date: 26-11-2012
DOI: 10.1201/B15320-77
Impact response of a novel sandwich structure with Kirigami modified corrugated core
Publisher: Elsevier BV
Date: 10-2021
Seismic response of bridge structures under non-uniform ground excitations
Publisher: CRC Press
Date: 20-07-2010
DOI: 10.1201/B10568-17
Blast resistant enhancement of meta-panels using multiple types of resonators
Publisher: Elsevier BV
Date: 02-2022
Durability characteristics of lightweight rubberized concrete
Publisher: Elsevier BV
Date: 11-2019
Numerical study of low-speed impact response of sandwich panel with tube filled honeycomb core
Publisher: Elsevier BV
Date: 07-2019
Seismic performances of precast segmental column under bidirectional earthquake motions: Shake table test and numerical evaluation
Publisher: Elsevier BV
Date: 05-2019
Influence of the concrete DIF model on the numerical predictions of RC wall responses to blast loadings
Publisher: Elsevier BV
Date: 08-2014
Dynamic Response of Rigid Blocks to Simultaneous Horizontal and Vertical Ground Shock
Publisher: SAGE Publications
Date: 07-2012
DOI: 10.1260/1369-4332.15.7.1069
Abstract: Surface and underground explosions generate ground shock that might result in overturning of equipment housed in nearby structures owing to rocking responses. Comprehensive studies of rigid structure responses to seismic ground excitations have been reported. It was found that the rocking and sliding response of a rigid structure is highly nonlinear. The structure stability depends on the structure slenderness, as well as the ground motion litude, frequency and duration. Compared to an earthquake ground motion, a ground shock has a very large litude, high frequency contents and short duration. Moreover, vertical component of a ground shock is often higher than the gravitational acceleration g. This will cause the unanchored equipment fly into air. Therefore, the responses and stability regions of a rigid structure to blast induced ground shock will be very different from those under seismic ground motions. No study of rocking response and overturning of rigid structure to ground shock of litude more than 1.0 g can be found in the literature. As there might be some important equipment in buildings near a mining or a quarry site, or a military command center subjected to ground shock, understanding rigid structure response to ground shock is essential for protection of such equipment. In this study, theoretical derivation and numerical prediction of rocking and flying responses and overturning of rigid structures to simultaneous horizontal and vertical ground shock are carried out. Numerical results of stability regions of rigid structures to ground shock are derived. Particular attentions are paid to the case when the vertical ground shock is more than 1.0 g and the rigid structure flies into the air. Results are compared to those obtained with earthquake ground motions. Discussions of the rigid structure stability to ground shock are made.
A substructural and wavelet multiresolution approach for identifying time-varying physical parameters by partial measurements
Publisher: Elsevier BV
Date: 04-2022
Numerical evaluation of the impact performance of precast concrete segmental columns and strengthening techniques
Publisher: Elsevier BV
Date: 10-2021
Effect of high strain rate and confinement on the compressive properties of autoclaved aerated concrete
Publisher: Elsevier BV
Date: 10-2021
Integrated ARMA model method for damage detection of subsea pipeline system
Publisher: Elsevier BV
Date: 03-2013
Energy dissipation in high-energy ship-offshore jacket platform collisions
Publisher: Elsevier BV
Date: 2015
Non-probabilistic method to consider uncertainties in frequency response function for vibration-based damage detection using Artificial Neural Network
Publisher: Elsevier BV
Date: 02-2020
Improved automated operational modal identification of structures based on clustering
Publisher: Hindawi Limited
Date: 24-10-2019
DOI: 10.1002/STC.2450
Stability of simple beam subjected to multiple seismic excitations
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-1997
New interlocking inter-module connection for modular steel buildings: Simplified structural behaviours
Publisher: Elsevier BV
Date: 2021
A Reinvestigation of a Spring-mass Model for Metamaterial Bandgap Prediction (vol 221, 107219, 2022)
Publisher: Elsevier BV
Date: 02-2023
Improved damage identification in bridge structures subject to moving loads: Numerical and experimental studies
Publisher: Elsevier BV
Date: 09-2013
Crashworthiness analysis and parametric investigation on kirigami corrugated structures
Publisher: Elsevier BV
Date: 12-2022
Experimental and numerical studies on square steel-reinforced concrete-filled steel tubular (SRCFST) members subjected to lateral impact
Publisher: Elsevier BV
Date: 03-2021
Numerical Study of Precast Concrete Beam Under Impact Loads
Publisher: Springer Singapore
Date: 04-09-2020
Influence of earthquake ground motion modelling on the dynamic responses of offshore wind turbines
Publisher: Elsevier BV
Date: 06-2019
Wavelet-based damage identification of structures under unknown support excitations
Publisher: CRC Press
Date: 21-10-2015
DOI: 10.1201/B17618-166
Study of concrete damage mechanism under hydrostatic pressure by numerical simulations
Publisher: Elsevier BV
Date: 2018
Influences of ground motion parameters and structural damping on the optimum design of inerter-based tuned mass dampers
Publisher: Elsevier BV
Date: 2021
Mechanical properties of carbon foams under quasi-static and dynamic loading
Publisher: Elsevier BV
Date: 10-2019
Numerical study on impact resistance of rubberised concrete roadside barrier
Publisher: SAGE Publications
Date: 14-08-2023
DOI: 10.1177/13694332221120130
Abstract: As an environmentally-friendly material, rubberised concrete has attracted a lot of attentions and researches in recent years. However, because of the addition of rubber crumbs, the strength and modulus of rubberised concrete are low as compared to normal concrete, which limit the wide applications of this material in construction of load-bearing structures. Considering the good deformation and impact resistance ability of rubberised concrete, many researchers have suggested that rubberised concrete material could be used to construct roadside barriers, but the research on rubberised concrete barrier subjected to vehicle collision is very limited. This paper studies the feasibility of application of this green material to make roadside barriers to resist vehicle impact. Numerical models of F-type barriers with A-grade and SS-grade made of rubberised concrete and normal concrete are established. The validities of the numerical models are verified by laboratory impact tests available in literature. The collision of the vehicle with the normal concrete barrier and the rubberised concrete barrier are simulated by the verified numerical models. The results show that the rubberised concrete barrier not only meets the safety requirements for roadside barriers, but also reduces the impact force acting on the vehicle and hence reduces the vehicle damage and risk of the drivers and passengers as compared with the normal concrete barrier. The results demonstrate the great application potentials of this green material for constructing roadside barriers and structures.
Critical review of Molkov's phenomenological model and variable stretch/turbulence function
Publisher: Elsevier BV
Date: 09-2016
Dynamic fracture in brittle solids at high rates of loading
Publisher: ASME International
Date: 05-2003
DOI: 10.1115/1.1571854
Abstract: This paper presents a dynamic damage model for predicting fracture and fragmentation of brittle materials subjected to loads with high loading rates. This model is based on the mechanics of microcrack nucleation, growth, and coalescence to formulate the evolution of damage. The damage in the model is assumed to be isotropic and is a function of time and applied stress. The model provides a direct, explicit, and quantitative method to determine the rate-dependent fracture stress and fragment size generated by crack coalescence in the dynamic fragmentation process. It considers the experimental facts that a brittle material does not fail if the applied stress is lower than its static strength and certain time duration is needed for fracture to take place when it is subjected to a stress higher than its static strength. Comparisons between theoretical predictions and test data are made and shown to be in good agreement.
Effectiveness of using pipe-in-pipe (PIP) concept to reduce vortex-induced vibrations (VIV): Three-dimensional two-way FSI analysis
Publisher: Elsevier BV
Date: 2018
Numerical simulation of underground explosions
Publisher: Informa UK Limited
Date: 1998
Identification of de-bonding between steel bars and concrete using wavelet techniques: Comparative study
Publisher: Informa UK Limited
Date: 2013
A study of RC bridge columns under contact explosion
Publisher: Elsevier BV
Date: 11-2017
Study on the long-hole raising technique using one blast based on vertical crater retreat multiple deck shots
Publisher: Elsevier BV
Date: 09-2018
Evaluating the effect of infill walls on seismic responses of post-tensioned self-centering concrete frames based on a new analytical model
Publisher: Elsevier BV
Date: 06-2023
Seismic response of a steel trussed arch structure to spatially varying earthquake ground motions including site effect
Publisher: SAGE Publications
Date: 12-2010
DOI: 10.1260/1369-4332.13.6.1089
Abstract: This paper investigates seismic response of a realistic large dimension steel trussed arch structure subjected to the combined spatially varying horizontal and vertical ground motions. The ground motion spatial variations associated with wave passage effect, coherency loss effect and local site effect are considered. In numerical calculations, the simulated spatially varying ground motions are in idually compatible with response spectrum defined in Chinese Seismic Design Code, and are compatible with an empirical coherency loss function between each other. Compared with structural responses calculated using uniform and delayed excitations, numerical results show that seismic response is lified when spatially varying ground motions including local site effect are considered. Each factor of ground motion spatial variations has a significant effect on the dynamic response of the structure. Numerical results also indicate that considering simultaneous vertical and horizontal ground motions will lead to more accurate response predictions of the trussed arch as compared with those obtained by considering horizontal excitations only. Therefore, to have an accurate structural response assessment and a better design of long span steel trussed arch structures, a reliable ground motion spatial variation model is essential.
Dynamics of steel offshore platforms under ship impact
Publisher: Elsevier BV
Date: 08-2014
Local shear connectors damage detection for a concrete-steel composite beam using acceleration time series
Publisher: American Society of Civil Engineers
Date: 11-03-2010
Analytical and numerical studies on impact force profile of RC beam under drop weight impact
Publisher: Elsevier BV
Date: 2021
Experimental study on subsea pipeline bedding condition assessment using wavelet packet transform
Publisher: Elsevier BV
Date: 03-2013
Laboratory tests and numerical simulations of barge impact on circular reinforced concrete piers
Publisher: Elsevier BV
Date: 2013
Performance of reinforced lightweight geopolymer composite panels subjected to windborne debris impacts
Publisher: Elsevier BV
Date: 08-2023
Local site effect on seismic response of coupled transmission tower-line system
Publisher: American Society of Civil Engineers
Date: 11-03-2010
Monocular vision based 3D vibration displacement measurement for civil engineering structures
Publisher: Elsevier BV
Date: 10-2023
Improved decentralized structural identification with output-only measurements
Publisher: Elsevier BV
Date: 07-2018
Structural damage detection by integrating robust PCA and classical PCA for handling environmental variations and imperfect measurement data
Publisher: SAGE Publications
Date: 08-04-2022
DOI: 10.1177/13694332221079090
Abstract: This paper proposes a vibration-based structural damage detection approach considering the effects of uncertainties, including environmental variations and random errors that possibly stem from measurement and automatic modal identification. The existing methods that only employ the classical Principle Component Analysis (PCA) have been demonstrated effective to remove the effects of environmental variations while extremely sensitive to random errors. Therefore, the robust PCA is firstly introduced to remove the random errors, especially outliers, that significantly corrupt the low-rank property of the stacked damage sensitive feature (DSF) matrix. Then, the classical PCA is used to extract the environmental variation-free residues, which are inherently damage-dependent and can be used to detect the existence of damage. The problem of missing data is also considered in this study. It is tackled by adding virtual random errors to the locations of missing entities and thus can be addressed by the introduced robust PCA. The advantages of the proposed approach include: (1) Handling the random error-contaminated DSF data regardless of the error’s litude, which is an intractable problem for the existing classical PCA-based methods to consider the environmental effects (2) Damage detection process can be automatic since the missing data can be automatically predicted and the random errors are not required to be manually distinguished. The effectiveness and performance of the proposed method are demonstrated on a numerical beam structure and an experimentally tested wooden bridge model.
Dynamic response of precast concrete beam with wet connection subjected to impact loads
Publisher: Elsevier BV
Date: 07-2019
Simplified structural behaviours of post-tensioned inter-module connection for modular buildings
Publisher: Elsevier BV
Date: 12-2020
Damage identification scheme based on compressive sensing
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2015
Spectral Element Model Updating for Damage Identification Using Clonal Selection Algorithm
Publisher: SAGE Publications
Date: 10-2011
DOI: 10.1260/1369-4332.14.5.837
Abstract: A spectral element model updating procedure is presented to identify damage in a structure using Guided wave propagation results. Two damage spectral elements (DSE1 and DSE2) are developed to model the local (cracks in reinforcement bar) and global (debonding between reinforcement bar and concrete) damage in one-dimensional homogeneous and composite waveguide, respectively. Transfer matrix method is adopted to assemble the stiffness matrix of multiple spectral elements. In order to solve the inverse problem, clonal selection algorithm is used for the optimization calculations. Two displacement-based functions and two frequency-based functions are used as objective functions in this study. Numerical simulations of wave propagation in a bare steel bar and in a reinforcement bar without and with various assumed damage scenarios are carried out. Numerically simulated data are then used to identify local and global damage of the steel rebar and the concrete-steel interface using the proposed method. Results show that local damage is easy to be identified by using any considered objective function with the proposed method while only using the wavelet energy-based objective function gives reliable identification of global damage. The method is then extended to identify multiple damages in a structure. To further verify the proposed method, experiments of wave propagation in a rectangular steel bar before and after damage are conducted. The proposed method is used to update the structural model for damage identification. The results demonstrate the capability of the proposed method in identifying cracks in steel bars based on measured wave propagation data.
Effect of abutment excitation on bridge pounding
Publisher: Elsevier BV
Date: 09-2013
Revisiting some phenomena in polyelectrolyte solutions
Publisher: Wiley
Date: 08-04-2002
DOI: 10.1002/POLB.10167
The Analysis of the Performance of Heating and the Economical Efficiency of the Solar Energy and Gas Heat Pump
Publisher: Elsevier BV
Date: 2015
Study on Simulation Performance of Solar Energy and Gas Heat Pump for Heating Supply
Publisher: Elsevier BV
Date: 2015
Response of reinforced mortar-less interlocking brick wall under seismic loading
Publisher: Springer Science and Business Media LLC
Date: 12-06-2022
DOI: 10.1007/S10518-022-01436-6
Abstract: Mortar-less construction with interlocking bricks has many advantages, such as improved construction efficiency and relatively low requirements on labour skills. Nevertheless, the seismic performance of interlocking brick structures is not well understood yet. In this paper, laboratory tests and numerical modelling are carried out to investigate the seismic behaviour of interlocking brick walls. Laboratory shaking table tests are performed on a scaled reinforced mortar-less interlocking brick wall. The response and damage modes under in-plane seismic loading are investigated. A detailed numerical model is then generated and validated with the laboratory testing data. Unlike the conventional masonry wall that diagonal shear damage governs the failure, the interlocking brick wall exhibits rocking responses, whose damage is mainly at the two bottom corners of the wall. Full-scale interlocking brick walls are then modelled and compared with conventional concrete masonry unit (CMU) walls bonded by mortar. Comparisons are made between the seismic resistances and damage modes of the two walls. The influences of ground motion intensities, vertical components of seismic excitations and different seismic time histories on the seismic behaviour of the interlocking brick wall are examined. It is found that the interlocking brick wall has a higher seismic resistance capacity than the conventional CMU wall. Inter-brick friction is the main energy dissipation mechanism in the interlocking brick wall. Because of the rocking response, vertical component of the ground motion significantly influences the damage of interlocking brick wall. The interlocking brick wall is insensitive to velocity pulses of ground motions due to its relatively high natural frequency.
Numerical investigation of the behavior of precast concrete segmental columns subjected to vehicle collision
Publisher: Elsevier BV
Date: 02-2018
Optimum lateral load pattern for seismic design of elastic shear-buildings incorporating soil-structure interaction effects
Publisher: Wiley
Date: 07-09-2013
DOI: 10.1002/EQE.2252
Influence of Bandgap on the Response of Periodic Metaconcrete Rod Structure under Blast Load
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-2022
Seismic performance of post-tensioned self-centering concrete frames under near-fault pulse-like ground motions
Publisher: Elsevier BV
Date: 02-2023
Estimation of strong seismic ground motion for engineering use in Perth Western Australia
Publisher: Elsevier BV
Date: 05-2009
Experimental study of dynamic bond behaviour between corroded steel reinforcement and concrete
Publisher: Elsevier BV
Date: 11-2022
Guided wave propagation and spectral element method for debonding damage assessment in RC structures
Publisher: Elsevier BV
Date: 07-2009
A reinvestigation of the spring-mass model for metamaterial bandgap prediction
Publisher: Elsevier BV
Date: 05-2022
Influence of various impact scenarios on the dynamic performance of concrete beam-column joints
Publisher: Elsevier BV
Date: 09-2022
Numerical derivation of averaged material properties of hollow concrete block masonry
Publisher: Elsevier BV
Date: 03-2008
Fragility analyses of offshore wind turbines subjected to aerodynamic and sea wave loadings
Publisher: Elsevier BV
Date: 11-2020
Influence of Fibre Shapes on Dynamic Compressive Behaviour of Fibre Reinforced Concrete
Publisher: Trans Tech Publications, Ltd.
Date: 07-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.82.112
Abstract: In this paper results are reported of impact tests performed to study the influence of different fibre types on dynamic compressive properties of fibre reinforced concrete (FRC). FRC specimens are prepared with the same concrete and 1% of fibres of different types. The compressive impact tests are conducted with an instrumented drop weight impact system consisting of a hard steel drop weight, two 180t fast response loadcells, a high speed video camera, and a fast response data acquisition system. In this study, six fibre types with different shapes and material properties are considered. They are synthetic fibres, undulated, cold rolled, flattened, hooked end and a new spiral shape steel fibres. The dynamic stress-strain relationship is obtained by fitting the load history from the bottom loadcell to the average strain history captured by the strain gages. The energy absorption capabilities are defined as the area under the stress-strain curve of FRC specimens. The performance of the new spiral shape steel fibre is discussed by comparing the test results with those obtained from specimens reinforced with other types of fibres. The influence of the fibre shapes on the failure modes, ductility and energy absorbing capacity of FRC is discussed.
A state-of-the-art review of road tunnel subjected to blast loads
Publisher: Elsevier BV
Date: 06-2021
Numerical study of medium to large scale BLEVE for blast wave prediction
Publisher: Elsevier BV
Date: 05-2020
A case study of interior low-frequency noise from box-shaped bridge girders induced by running trains: Its mechanism, prediction and countermeasures
Publisher: Elsevier BV
Date: 04-2016
Condition assessment of shear connectors in slab-girder bridges via vibration measurements
Publisher: American Society of Civil Engineers (ASCE)
Date: 2008
Compressive mechanical properties and dynamic behaviour of origami-inspired tri-directional auxetic metastructure
Publisher: Elsevier BV
Date: 04-2023
Effects of Axial Air Deck on Blast-Induced Ground Vibration
Publisher: Springer Science and Business Media LLC
Date: 26-11-2022
Influence of Higher Modes on Strength and Ductility Demands of Soil-Structure Systems
Publisher: World Scientific Pub Co Pte Ltd
Date: 10-2016
DOI: 10.1142/S1793431116500068
Abstract: Due to the inherent complexity, the common approach in analyzing nonlinear response of structures with soil–structure interaction (SSI) in current seismic provisions is based on equivalent Single Degree-of-Freedom systems (E-SDOF). This paper aims to study the influence of higher modes on the seismic response of SSI systems by performing intensive parametric analyses on more than 6400 linear and non-linear Multi Degree-of-Freedom (MDOF) and E-SDOF systems subjected to 21 earthquake records. An established soil-shallow foundation-structure model with equivalent linear soil behavior and nonlinear superstructure has been utilized using the concept of cone models. The lateral strength and ductility demands of MDOF soil–structure systems with different number of stories, structure-to-soil stiffness ratio, aspect ratio and level of inelasticity are compared to those of E-SDOF systems. The results indicate that using the common E-SDOF soil–structure systems for estimating the strength and ductility demands of medium and slender MDOF structures can lead to very un-conservative results when SSI effect is significant. This implies the significance of higher mode effects for soil–structure systems in comparison with fixed-based structures, which is more pronounced for the cases of elastic and low level of inelasticity.
Laboratory test on dynamic material properties of annealed float glass
Publisher: SAGE Publications
Date: 12-2012
DOI: 10.1260/2041-4196.3.4.407
Abstract: In this study, laboratory tests were conducted to investigate the dynamic material properties of annealed float glass, which is widely used in building applications. The influence of strain rate effect on glass strength and Young's modulus is studied. Quasi-static tests were performed first to determine the glass static strength and Young's modulus then dynamic compressive tests were carried out at the strain rates from 98/s to 376/s using a modified Split Hopkinson Pressure Bar. Tensile tests were performed in the strain rate range of 35/s to 990/s through splitting tensile test (Brazilian test). Test results reveal that the compressive and tensile strengths of annealed glass are very sensitive to strain rate. Dynamic increment on glass compressive strength is found more significant than its tensile strength, a phenomenon different from other brittle materials such as concrete. The Young's modulus is found relatively insensitive to strain rate in the testing range, and is slightly larger in compressive tests than in tensile tests. Based on the test data compressive and tensile dynamic increment factors (DIF) of annealed glass with respect to strain rate are formulated. The glass fracture process is also investigated in this paper based on the images taken by high-speed camera during the tests. The fracture images and glass fragments are discussed and used to explain the testing results.
The correlation of theoretical contact models for normal elastic-plastic impacts
Publisher: Elsevier BV
Date: 2020
Improved impact resistant capacity of segmental column with fibre reinforced polymer wrap
Publisher: Elsevier BV
Date: 03-2019
A study of concrete slabs with steel wire mesh reinforcement under close-in explosive loads
Publisher: Elsevier BV
Date: 12-2017
Development of a Simplified Numerical Method for Structural Response Analysis to Blast Load
Publisher: Elsevier BV
Date: 2011
Development of locally resonant meta-basement for seismic induced vibration control of high-rise buildings
Publisher: Elsevier BV
Date: 2023
Multi-hazard resistance capacity of precast segmental columns under impact and cyclic loading
Publisher: SAGE Publications
Date: 03-2018
Abstract: Using precast segmental concrete columns in structures improves the construction efficiency and site safety, leads to better construction quality, and reduces the construction cost, site disruption and environmental impact. The performance of segmental columns to resist earthquake and impact loads is not well studied yet. As a structure might be subjected to such loads during its service life, understanding its resistance capacities is essential for structural safety. This article reports the findings of our recent studies on the response of precast segmental columns with unbonded prestress tendons. Pendulum impact test and uniaxial cyclic test were conducted on quarter-scale segmental columns. The seismic performance and impact-resistant capacity were evaluated experimentally and compared with a reference conventional monolithic column. Test results showed that under cyclic loading, segmental columns exhibited better deformation ability and smaller residual drift under impact loading, segmental columns also showed better self-centring capacity and less residual displacement. By introducing concrete shear key, the shear resistance at segmental joint could be improved however, shear key would also result in more concrete segment damage owing to stress concentration.
Statistical damage identification of structures with frequency changes
Publisher: Elsevier BV
Date: 06-2003
Influences of random imperfection distribution on the compressive properties of interlocking block wall
Publisher: Elsevier BV
Date: 10-2023
Study on the raising technique using one blast based on the combination of long-hole presplitting and vertical crater retreat multiple-deck shots
Publisher: Elsevier BV
Date: 2019
Numerical study of blast mitigation performance of folded structure with foam infill
Publisher: Elsevier BV
Date: 08-2019
Dynamic compressive material properties of clay bricks at different strain rates
Publisher: Elsevier BV
Date: 12-2018
Experimental investigation of dynamic post-buckling characteristics of rectangular plates under fluid-solid slamming
Publisher: Elsevier BV
Date: 06-2000
Axial Impact Resistance of FRP-Confined Concrete
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2017
Failure and impact resistance analysis of plain and fiber-reinforced-polymer confined concrete cylinders under axial impact loads
Publisher: SAGE Publications
Date: 02-01-2018
Abstract: This study conducts an experimental and numerical investigation on the failure and impact resistance of plain and fiber-reinforced polymer-confined concrete. The impact resistance of concrete cylinders wrapped with different types of fibers including carbon fiber and glass fiber is examined. Drop-weight tests are utilized to conduct the impact tests while the numerical simulation is conducted using LS-DYNA. The experimental and numerical results have proved that fiber-reinforced polymer can be efficiently used to improve the impact resistance of concrete cylinders. In general, fiber-reinforced polymer ruptures at a lower strain than those in static tests and the rupture strain of glass fiber is much higher than that of carbon fiber. The findings in the experimental tests are confirmed by the numerical results. Glass fiber, therefore, exhibits a much better performance than carbon fiber. It is recommended to use glass fiber to enhance the impact resistance of concrete structures strengthened with fiber-reinforced polymer. In addition, the stress evolution of the specimens is analyzed to investigate the failure mechanism.
Numerical study of fence type blast walls for blast load mitigation
Publisher: Elsevier BV
Date: 09-2019
Application of elastic metamaterials/meta-structures in civil engineering: A review
Publisher: Elsevier BV
Date: 10-2024
The complementary heating energy ratio research of solar: Ground source heat pump and heating network in cold regions
Publisher: Springer Berlin Heidelberg
Date: 24-09-2014
Modeling of wave propagation induced by underground explosion
Publisher: Elsevier BV
Date: 04-1998
Mesoscale modelling of dynamic tensile behaviour of fibre reinforced concrete with spiral fibres
Publisher: Elsevier BV
Date: 11-2012
Towards next generation design of sustainable, durable, multi-hazard resistant, resilient, and smart civil engineering structures
Publisher: Elsevier BV
Date: 02-2023
Performance-Based Seismic Assessment of Superelastic Shape Memory Alloy-Reinforced Bridge Piers Considering Residual Deformations
Publisher: Informa UK Limited
Date: 27-07-2017
Field Testing of Fence Type Blast Wall for Blast Load Mitigation
Publisher: World Scientific Pub Co Pte Lt
Date: 23-10-2017
DOI: 10.1142/S0219455417500997
Abstract: To protect structures from external explosions, solid protective barriers have been demonstrated by experimental and numerical studies to be able to effectively mitigate blast loads on structures behind them. However, to protect against blast loads, barriers normally need to be designed to have high structural resistance and ductility. This often requires bulky and heavy protective barriers which are not only highly costly but also often not appropriate for application in downtown areas as they are not friendly to city planning or appearance. Fence type blast wall consisting of structural columns was recently proposed and its effectiveness in mitigating blast loads was investigated through numerical simulations. It was found that the wave–fence interaction and interference of waves significantly reduced the wave energy when the blast wave passed through the fence blast wall. To further investigate the effectiveness and applicability of fence type blast wall as a highly potential technology for structural protection in an urban area, field tests have been conducted and results are reported in this paper. Columns with circular and triangular cross-sections were adopted to build fence blast walls. In addition, a masonry wall was also constructed as solid barrier for comparison. Hemispherical TNT explosive weighing 1.0 kg with different stand-off distances was detonated on the ground to generate the blast load. Blast overpressures in free air, behind the fence blast wall and behind the masonry wall were recorded by pressure sensors. The effectiveness of the fence blast wall in reducing blast wave and protecting structures was demonstrated by the test data.
Experimental and numerical study on the impact resistance of ultra-high performance concrete strengthened RC beams
Publisher: Elsevier BV
Date: 02-2023
Precast segmental beams made of fibre-reinforced geopolymer concrete and FRP tendons against impact loads
Publisher: Elsevier BV
Date: 11-2023
Experimental study of multi-layer folded truncated structures under dynamic crushing
Publisher: Elsevier BV
Date: 09-2019
Static mechanical properties and stress wave attenuation of metaconcrete subjected to impulsive loading
Publisher: Elsevier BV
Date: 07-2022
Quasi-static and dynamic tensile properties of basalt fibre reinforced polymer
Publisher: Elsevier BV
Date: 09-2017
Evaluation of bridge load carrying capacity using updated finite element model and nonlinear analysis
Publisher: SAGE Publications
Date: 02-2094
DOI: 10.1260/1369-4332.15.10.1739
Abstract: The integrity of ageing bridges is in doubt because of increasing traffic loads, deterioration of materials, possible damage during service, and revised code requirements. Traditional methods in prediction of load varying capacity of bridges are usually based on the design blueprints and may not reflect the bridge condition as is. In this paper, the nonlinear finite element analysis, incorporating the model updating technique, is used to predict the behaviour of a 30-year-old slab-girder bridge. The original finite element model based on the design drawings is updated by modifying the stiffness parameters of the girders, slab, shear connectors and bearings so that the vibration properties of the model match the field vibration measurement data. The updated model represents the present condition of the bridge better than the original model that is based on the design blueprints. The load carrying capacity of the bridge is then calculated using the original and updated finite element models, respectively, with consideration of nonlinear material properties. The comparison shows that the bridge load carrying capacity under the present condition is lower than that under the design condition, whereas is still above the design requirement. The influence of the shear connectors on the load carrying capacity is specially investigated.
Effects of Cover Depth and Rock Type on Dynamic Response of Road Tunnels Against Internal Explosions
Publisher: World Scientific Pub Co Pte Ltd
Date: 08-2022
DOI: 10.1142/S1758825122500673
Abstract: Dynamic response of road tunnels against internal explosions can vary depending on the types and cover depths of surrounding rock mass. However, the influences of cover depth and rock type on dynamic response of road tunnels under internal explosions are very less investigated. Based on the calibrated numerical model of road tunnel, the present study investigates the dynamic response of an arched road tunnel subjected to an internal Boiling Liquid Expansion Vapour Explosion (BLEVE) and its equivalent TNT explosion under varied cover depths and different rock types. The results indicate that the increment of the cover depth can reduce the lining response (e.g., strain energy and damage) against the internal BLEVE. However, beyond a certain cover depth, the TNT explosion-induced lining response (e.g., strain energy) escalates with the increased cover depth due to the enlarged rebound deformations of the lining with the increased in-situ stress. In addition, the rock mass with better mechanical properties is beneficial to reduce the tunnel response under the internal BLEVE but leads to more severe tunnel response under the internal TNT explosion. Using equivalent TNT explosion loads may not give reliable predictions of tunnel responses subjected to BLEVE loads.
Dynamic compressive properties of Kalgoorlie basalt rock
Publisher: Elsevier BV
Date: 11-2020
FEM calibrated ARMAX model updating method for time domain damage identification
Publisher: SAGE Publications
Date: 2013
DOI: 10.1260/1369-4332.16.1.51
Abstract: Due to environmental loads, mechanical damages, structural aging and human factors, civil infrastructure inevitably deteriorate during their service lives. Since their damage may claim human lives and cause significant economic losses, how to identify damages and assess structural conditions timely and accurately has drawn increasingly more attentions from structural engineering community worldwide. In this study, a fast and sensitive time domain damage identification method will be developed. To do this, a finite element model of a steel pipe laid on the soil is built and the structural responses are simulated under different damage scenarios. Based on the simulated data, an Auto Regressive Moving Average Exogenous (ARMAX) model is then built and calibrated. The calibrated ARMAX model is used to identify different damage scenarios through model updating process using clonal selection algorithm (CSA). The results demonstrate the application potential of the proposed method in identifying the pipeline conditions. To further verify its performance, laboratory tests of a steel pipe laid on the soil with and without soil support (free span damage) are carried out. The identification results of pipe-soil system show that the proposed method is capable of identifying damagein a complex structural system. Therefore, it can be applied to identifying pipeline conditions.
Numerical study of blast-resistant sandwich panels with rotational friction dampers
Publisher: World Scientific Pub Co Pte Lt
Date: 02-07-2013
DOI: 10.1142/S0219455413500144
Abstract: Blast-resistant structures are traditionally designed with solid materials of huge weight to resist blast loads. This not only increases the construction costs, but also undermines the operational performance. To overcome these problems, many researchers develop new designs with either new materials or new structural forms, or both to resist the blast loads. Friction d er, as a passive energy absorber, has been used in earthquake-resistant design to absorb vibration energy from cyclic loading. The use of friction d er in blast-resistant design to absorb high-rate impact and blast energy, however, has not been well explored. This study introduces a new sandwich panel equipped with rotational friction hinge device with spring (RFHDS) between the outer and inner plates to resist the blast loading. This device RFHDS, as a special sandwich core and energy absorber, consists of rotational friction hinge device (RFHD) and spring. The RFHD is used to absorb blast energy while the spring is used to restore the original shape of the panel. This paper studies the mechanism of RFHD by using theoretical derivation and numerical simulations to derive its equivalent force–displacement relation and study its energy absorption capacity. In addition, the energy absorption and blast loading resistance capacities of the sandwich panel equipped with RFHDS are numerically investigated by using Ls-Dyna. It is found that the proposed sandwich panel can recover, at least partially its original configuration after the loading and thus maintain its operational and blast-resistance capability after a blasting event. In order to maximize the performance of the proposed sandwich panel, parametric calculations are carried out to study the performance of RFHDS and the sandwich panels with RFHDS. The best performing sandwich panel with RFHDS in resisting blast loadings is identified. This sandwich panel configuration might be employed to mitigate blast loading effects in structural sandwich panel design.
Dynamic response of road tunnel subjected to internal Boiling liquid expansion vapour explosion (BLEVE)
Publisher: Elsevier BV
Date: 05-2022
Experimental and computational Fluid Dynamics study of separation gap effect on gas explosion mitigation for methane storage tanks
Publisher: Elsevier BV
Date: 09-2018
Numerical study of sandwich panel with a new bi-directional Load-Self-Cancelling (LSC) core under blast loading
Publisher: Elsevier BV
Date: 06-2018
Arch responses to correlated multiple excitations
Publisher: Wiley
Date: 05-1993
Probabilistic model updating via variational Bayesian inference and adaptive Gaussian process modeling
Publisher: Elsevier BV
Date: 09-2021
New epoxy anchor for better bonding between FRP sheets and concrete
Publisher: Elsevier BV
Date: 07-2020
Energy Absorption of Kirigami Modified Corrugated Structure
Publisher: Elsevier BV
Date: 09-2020
Dynamic compressive properties of high volume fly ash (HVFA) concrete with nano silica
Publisher: Elsevier BV
Date: 09-2021
Performance of concrete targets mixed with coarse aggregates against rigid projectile impact
Publisher: Elsevier BV
Date: 07-2012
Impedance resonant frequency sensitivity based structural damage identification with sparse regularization: Experimental studies
Publisher: IOP Publishing
Date: 20-11-2019
Origami metamaterial with two-stage programmable compressive strength under quasi-static loading
Publisher: Elsevier BV
Date: 2021
Response of multiply supported rigid plate to spatially correlated seismic excitations
Publisher: Wiley
Date: 1991
Seismic Fragility Analysis of Reinforced Concrete Bridges with Chloride Induced Corrosion Subjected to Spatially Varying Ground Motions
Publisher: World Scientific Pub Co Pte Lt
Date: 27-04-2016
DOI: 10.1142/S0219455415500108
Abstract: This paper studies the time-dependent seismic fragility of reinforced concrete bridges with chloride induced corrosion under spatially varying ground motions. The time-varying characteristic of the chloride corrosion current density and the uncertainties related to the structural, material and corrosion parameters are both considered in the probabilistic finite element modeling of the ex le RC bridge at different time steps during its life-cycle. Spatially varying ground motions at different bridge supports are stochastically simulated and used as inputs in the fragility analysis. Seismic fragility curves of the corroded RC bridge at different time steps are generated using the probabilistic seismic demand analysis (PSDA) method. Numerical results indicate that both chloride induced corrosion and ground motion spatial variations have a significant effect on the bridge structural seismic fragility. As compared to the intact bridge, the mean peak ground accelerations (PGAs) of the fragility curves of the RC bridge decrease by approximately 40% after 90 years since the initiation of corrosion. Moreover, the effect of ground motion spatial variations changes along with the process of chloride induced corrosion owing to the structural stiffness degradation. Neglecting seismic ground motion spatial variations may not lead to an accurate estimation of the lifetime seismic fragility of RC bridges with chloride induced corrosion.
Effectiveness of reinforcing methods in enhancing the lateral impact performance of geopolymer concrete column reinforced with BFRP bars
Publisher: Elsevier BV
Date: 05-2023
Multi-stage identification scheme for detecting damage in structures under ambient excitations
Publisher: IOP Publishing
Date: 03-2013
Improved analysis for impact response prediction of reinforced concrete structures considering stress wave propagation and time dependent shape function
Publisher: Elsevier BV
Date: 12-2023
Local-mode resonance and its structural effects under horizontal ground shock excitations
Publisher: Elsevier BV
Date: 06-2002
Reliability analysis of direct shear and flexural failure modes of RC slabs under explosive loading
Publisher: Elsevier BV
Date: 02-2002
A state-of-the-art review of experimental and numerical studies on BLEVE overpressure prediction
Publisher: Elsevier BV
Date: 12-2022
Reliability analysis of reinforced concrete slabs under explosive loading
Publisher: Elsevier BV
Date: 2001
A Novel Damage Assessment Method for RC Beam Using Force-Hammer Excitation and Piezoelectric Sensing Technology
Publisher: Hindawi Limited
Date: 27-04-2023
DOI: 10.1155/2023/4365213
Abstract: Concrete is the most commonly used construction material in infrastructural projects, but it may suffer from damages because of the heavy loads, fatigue, and harsh service environments. Therefore, it is crucial to detect damage for evaluating the structural conditions and providing guidance for daily maintenance and timely alarm. This paper presents a novel method for damage assessment that offers an easy-carried detection process with a large monitoring range. The proposed method involves exciting stress waves using a force-hammer and receiving them with piezoceramics pasted on the structure. The structural conditions are then evaluated using the Pearson correlation coefficient (PCC) of stress waves received from different stages. To verify the feasibility of the proposed method, a numerical model is innovatively established to study the stress wave propagation in a reinforced concrete (RC) beam with actual damage induced by the external load based on the concrete damaged plasticity (CDP) model. The experimental study is then conducted to demonstrate the effectiveness of the method and the accuracy of the numerical simulation. The numerical and experimental results show a good correlation, illustrating that the proposed method can not only effectively distinguish whether damage occurs but also determine the structural condition from the elastic phase to failure. The proposed monitoring method in this study has great potential for fast damage assessment of RC structures for both lab research and practical applications.
Influence of drop weight geometry and interlayer on impact behavior of RC beams
Publisher: Elsevier BV
Date: 09-2019
Significance of SSI and nonuniform near-fault ground motions in bridge response I: Effect on response with conventional expansion joint
Publisher: Elsevier BV
Date: 2008
Ductile and dry exterior joints using CFRP bolts for moment-resisting frames
Publisher: Elsevier BV
Date: 12-2020
Effect of structural characteristics distribution on strength demand and ductility reduction factor of MDOF systems considering soil-structure interaction
Publisher: Springer Science and Business Media LLC
Date: 06-2012
Theoretical investigation of bridge seismic responses with pounding under near-fault vertical ground motions
Publisher: SAGE Publications
Date: 04-2015
DOI: 10.1260/1369-4332.18.4.453
Abstract: Vertical earthquake loading is normally regarded not as important as its horizontal components and are not explicitly considered in many seismic design codes. However, some previous severe near-fault earthquakes reveal that the vertical ground motion component can be much larger than the horizontal components and may cause serious damage to the bridge structures. This paper theoretically investigates the vertical pounding responses of a two-span continuous bridge subjected to the severe near-fault vertical ground motions. The bridge is simplified as a continuous beam-spring-rod model. The structural wave effect and the vertical pounding between the bridge girder and the supporting bearing are considered, and the theoretical solutions of bridge seismic responses are derived from the expansion of transient wave functions as a series of eigenfunctions. The effects of vertical earthquake and vertical pounding on the bridge bearing, girder and pier are investigated. The numerical results show that the severe vertical earthquake loading may cause the bridge girder to separate from the supporting bearing and hence result in vertical poundings between them when they are in contact again. These vertical poundings can significantly alter the seismic responses of the bridge structure and may cause severe damage to the bridge components such as bridge girder, supporting bearing and bridge pier. Neglecting the influence of vertical earthquake loading may lead to inaccurate estimation of seismic responses of bridge structures, especially when they are subjected to near-fault earthquake with relatively large vertical motion.
Vented Methane-air Explosion Overpressure Calculation-A simplified approach based on CFD
Publisher: Elsevier BV
Date: 07-2017
Investigation of ultra-high performance concrete slab and normal strength concrete slab under contact explosion
Publisher: Elsevier BV
Date: 11-2015
Spatial ground motion effect on relative displacement of adjacent building structures
Publisher: Wiley
Date: 04-1999
DOI: 10.1002/(SICI)1096-9845(199904)28:4<333::AID-EQE820>3.0.CO;2-R
A Frobenius solution to the scaled boundary finite element equations in frequency domain for bounded media
Publisher: Wiley
Date: 2007
DOI: 10.1002/NME.1926
Stress Wave Propagation and Structural Response of Precast Concrete Segmental Columns under Simulated Blast Loads
Publisher: Elsevier BV
Date: 09-2020
Blast resistance of concrete slab reinforced with high performance fibre material
Publisher: Informa UK Limited
Date: 02-04-2016
Prediction of blast response of RC columns considering dynamic bond-slip between reinforcement and concrete
Publisher: Elsevier BV
Date: 05-2023
Numerical prediction of blast-induced stress wave from large-scale underground explosion
Publisher: Wiley
Date: 09-12-2004
DOI: 10.1002/NAG.328
Review on impact response of reinforced concrete beams: Contemporary understanding and unsolved problems
Publisher: SAGE Publications
Date: 26-02-2021
Abstract: Designing protective reinforced concrete (RC) beams against impact loadings is a challenging task. It requires a comprehensive understanding of the structural response of RC beams subjected to impact loads. Significant research efforts have been spent to unveil the impact response of RC beams by using analytical models, experimental testing, or numerical investigations. However, these studies used various assumptions in the analytical derivations and different test setups in the impact testing, which led to significantly different responses and observations of similar structures and similar loading conditions. For ex le, a minor change in contact surface can triple the maximum impact force of identical RC beams. This study provides a review of the contemporary understandings of the RC beam responses to impact loads, and explains the different observations and conclusions. Some unsolved issues for protective structures, that is, RC beams to resist impulsive loads are also discussed. It is suggested that future studies should take into consideration the conditions of the test setup, simplifications and assumptions made in analytical derivations for better interpretations of the obtained results.
Damage Identification of Shear Connectors with Wavelet Packet Energy: Laboratory Test Study
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2008
Three-dimensional finite element modelling of rocking bridge piers under cyclic loading and exploration of options for increased energy dissipation
Publisher: Elsevier BV
Date: 07-2016
Compressive behaviour of tungsten fibre reinforced Zr-based metallic glass at different strain rates and temperatures
Publisher: Elsevier BV
Date: 08-2017
Flexural behaviour of ambient cured geopolymer concrete beams reinforced with BFRP bars under static and impact loads
Publisher: Elsevier BV
Date: 04-2021
Development of an integrated structural health monitoring system for bridge structures in operational conditions
Publisher: Springer Science and Business Media LLC
Date: 14-07-2012
Behaviour of ultra high performance fibre reinforced concrete columns subjected to blast loading
Publisher: Elsevier BV
Date: 07-2016
Behavior of Ultrahigh-Performance Concrete Bridge Decks with New Y-Shape FRP Stay-in-Place Formworks
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2022
Dynamic analyses of operating offshore wind turbines including soil structure interaction
Publisher: Elsevier BV
Date: 02-2018
Analysis of fragment size and ejection velocity at high strain rate
Publisher: Elsevier BV
Date: 2004
Dynamic crushing performance of bio-inspired sandwich structures with beetle forewing cores
Publisher: Elsevier BV
Date: 03-2023
Simulation of Spatially Varying Seafloor Motions Using Onshore Earthquake Recordings
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2018
Dynamic buckling of simply supported columns under axial slamming
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-1999
Parametric study of laminated glass window response to blast loads
Publisher: Elsevier BV
Date: 11-2013
Bayesian based nonlinear model updating using instantaneous characteristics of structural dynamic responses
Publisher: Elsevier BV
Date: 03-2019
Lifetime seismic performance assessment on post-tensioned self-centering concrete frames considering long-term prestress loss
Publisher: Elsevier BV
Date: 07-2022
Impact force profile and failure classification of reinforced concrete bridge columns against vehicle impact
Publisher: Elsevier BV
Date: 03-2019
Effect of enhanced coating layer on the bandgap characteristics and response of metaconcrete
Publisher: Informa UK Limited
Date: 15-12-2023
A Study of Corrolink Structural Insulated Panel (SIP) to Windborne Debris Impacts
Publisher: Trans Tech Publications, Ltd.
Date: 08-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.626.68
Abstract: Structural insulated panel (SIP) is considered as a green panel in construction industry because of the low thermal conductivity of the sandwiched EPS core (i.e extended polystyrene). It is a lightweight composite structure and is widely used in commercial, industrial and residential buildings to construct the building envelop including roof and wall. The windborne debris driven by cyclone or hurricane usually imposes intensive localized impact on the structural panel, which might create opening to the structure. The opening on the building envelope might cause internal pressures increase and result in substantial damage to the building structures, such as roof lifting up and wall collapse. The Australian Wind Loading Code (version 2011) [1] requires structural panels to resist projectile debris impact at a velocity equal to 40% of the wind speed, which could be more than 40 m/s in the tropical area with the wind speed more than 100m/s. In this study, two kinds of SIP under projectile debris impact were investigated, i.e. “Corrolink” and “Double-corrolink” composite panels shown in Fig. 1. Laboratory tests were carried out by using pneumatic cannon testing system to investigate the dynamic response of composite panels subjected to wooden projectile impacts. The failure modes were observed. The structural dynamic responses were also examined quantitatively based on the deformation and strain time histories measured in the tests. The penetration resistance capacity of panels subjected to windborne debris impact was assessed. Fig. 1 Schematic diagrams (L) Corrolink panel (R) Double-corrolink panel [2]
Enhancing fiber/matrix bonding in polypropylene fiber reinforced cementitious composites by microbially induced calcite precipitation pre-treatment
Publisher: Elsevier BV
Date: 04-2018
Target-free 3D tiny structural vibration measurement based on deep learning and motion magnification
Publisher: Elsevier BV
Date: 11-2022
Numerical study of characteristics of underground blast induced surface ground motion and their effect on above-ground structures. Part II. Effects on structural responses
Publisher: Elsevier BV
Date: 2005
Numerical study of characteristics of underground blast induced surface ground motion and their effect on above-ground structures. Part I. Ground motion characteristics
Publisher: Elsevier BV
Date: 2005
Proposed design procedure for reinforced concrete bridge columns subjected to vehicle collisions
Publisher: Elsevier BV
Date: 12-2019
Static and dynamic mechanical properties of expanded polystyrene
Publisher: Elsevier BV
Date: 03-2015
Homogenization of Masonry using numerical simulations
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2001
On the effectiveness of rotational friction hinge damper to control responses of multi-span simply supported bridge to non-uniform ground motions
Publisher: SAGE Publications
Date: 28-07-2016
Abstract: Base isolation techniques have been extensively used to improve the seismic performance of the bridge structures. The decoupling of the bridge decks from the piers and abutments using rubber isolator could result in significant reduction in seismic forces transmitted to the bridge substructures. However, the isolation devices could also increase the deck displacement and thus enhance the possibility of pounding and unseating damage of bridge decks. Moreover, previous investigations have shown that pounding and unseating damages on isolated bridges exacerbate due to the spatial variation in earthquake ground motions. Recent earthquakes revealed that isolation bearing could also be damaged due to the excessive movements of decks during large earthquake events. This study proposes the use of rotational friction hinge d ers to mitigate the damages that could be induced by large displacement of bridge decks, particularly focusing on pounding and unseating damages and bearing damages. The device is capable of providing large hysteretic d ing and the cost of installing the devices is relatively economical. This article presents numerical investigations on the effectiveness of these devices on a typical Nepalese simply supported bridge subjected to spatially varying ground motions. The results indicate that rotational friction hinge d ers are very effective in mitigating the relative displacement and pounding force, as well as controlling the bearing deformation and pier drift. It is also revealed that the effectiveness of the device is not significantly affected by small changes in the slip forces thus, small variations in the optimum slip forces during the lifetime of the bridge do not warrant any adjustment or replacement of the device.
Probing the effect of Mg doping on triclinic Na2Mn3O7 transition metal oxide as cathode material for sodium-ion batteries
Publisher: Elsevier BV
Date: 10-2021
Damage detection of wind turbine blades by Bayesian multivariate cointegration
Publisher: Elsevier BV
Date: 08-2022
Effect of internal explosion on tunnel secondary and adjacent structures: A review
Publisher: Elsevier BV
Date: 08-2022
An efficient method to derive statistical mechanical properties of concrete reinforced with spiral-shaped steel fibres in dynamic tension
Publisher: Elsevier BV
Date: 10-2016
Influence of concrete strength on dynamic interfacial fracture behaviour between fibre reinforced polymer sheets and concrete
Publisher: Elsevier BV
Date: 04-2020
Investigation of shear performance of UHPC by direct shear tests
Publisher: Elsevier BV
Date: 03-2019
Numerical quantification of factors influencing high-speed impact tests of concrete material
Publisher: CRC Press
Date: 17-08-2012
DOI: 10.1201/B12768-5
Blast behaviour of precast segmental vs monolithic concrete beams prestressed with unbonded tendons: A numerical investigation
Publisher: Elsevier BV
Date: 03-2023
Mitigation of tower and out-of-plane blade vibrations of offshore monopile wind turbines by using multiple tuned mass dampers
Publisher: Informa UK Limited
Date: 17-01-2019
Seismic response analysis of multiple-frame bridges with unseating restrainers considering ground motion spatial variation and SSI
Publisher: SAGE Publications
Date: 06-2015
DOI: 10.1260/1369-4332.18.6.873
Abstract: Unseating damages of bridge decks have been observed in many previous major earthquakes due to large relative displacement exceeding the available seat length. Steel cable restrainers are often used to limit such relative displacements. Present restrainer design methods are based on the relative displacements caused by the different dynamic characteristics of adjacent bridge structures. However, the relative displacements in bridge structures are not only caused by different dynamic characteristics of adjacent bridge segments. Recent studies indicated that differential ground motions at supports of bridge piers and Soil Structure Interaction (SSI) could have a significant influence on the relative displacement of adjacent bridge components. Thus the present design methods could significantly underestimate the relative displacement responses of the adjacent bridge components and the stiffness of the restrainers required to limit these displacements. None of the previous investigations considered the effects of spatially varying ground motions in evaluating the adequacy of the restrainers design methods. Moreover, the code recommendation of adjusting the fundamental frequencies of adjacent bridge structures close to each other to mitigate relative displacement induced damages is developed based on the uniform ground motion assumption. Investigations on its effectiveness to mitigate the relative displacement induced damages on the bridge structures subjected to spatially varying ground motion and SSI are made. This paper discusses the effects of spatially varying ground motions and SSI on the responses of the multiple-frame bridges with unseating restrainers through inelastic bridge response analysis.
Measurement selection for vibration-based structural damage identification
Publisher: Elsevier BV
Date: 09-2000
A study of variability and applicability of various signal processing techniques in structural system identification
Publisher: Informa UK Limited
Date: 2013
Dynamic Assessment of Shear Connectors in Composite Bridges with Ambient Vibration Measurements
Publisher: SAGE Publications
Date: 05-2014
DOI: 10.1260/1369-4332.17.5.617
Abstract: Shear connectors are normally used in composite bridges, such as slab-on-girder structures, to link the slab and girder together. Damage of shear connectors will result in shear slippage between slab and girder, which significantly reduces the load-carrying capacity of the bridge. Routine visual inspection is not able to detect conditions of shear connectors because they are buried inside the structure. This paper proposes a dynamic damage detection approach based on wavelet packet energy of cross-correlation functions from ambient vibration measurements to identify the damage of shear connectors in slab-on-girder bridges. Measured acceleration responses on the slab and corresponding girder locations under ambient vibrations are used to compute the cross-correlation functions. Wavelet packet decompositions of cross-correlation functions from the undamaged and damaged structures are performed and the percentage of wavelet packet energy in selected frequency bandwidths to the total wavelet packet energy is used to calculate the damage index. Numerical and experimental studies on a composite bridge with a concrete slab supported by two steel girders are conducted to validate the proposed approach and investigate its performance and robustness with noisy measured responses. It is demonstrated that the introduced damage of shear connectors can be identified accurately and efficiently.
Analysis of coupled lateral-torsional-pounding responses of one-storey asymmetric adjacent structures subjected to bi-directional ground motions Part II: Spatially varying ground motion input
Publisher: SAGE Publications
Date: 10-2005
DOI: 10.1260/136943305774857990
Abstract: This is the second paper presenting numerical results of a parametric study of seismic induced lateral-torsional-pounding responses of an asymmetric and a symmetric one-storey adjacent structure. The accompany paper (Part I) (Gong and Hao 2004) assumed ground motion input at all structural supports as uniform. Torsional responses are generated because of inherent structural eccentricity and eccentric pounding. In reality, seismic ground motion at different structural supports inevitably varies owing to wave propagation. Spatially varying ground motion will induce torsional responses of structures, and generate out-of-phase responses between adjacent structures. Thus it might have a significant effect on coupled lateral-torsional-pounding responses. This paper studies the ground motion spatial variation effect. For comparison purpose, same adjacent structure models and impact element used in Part I of this study are adopted here again. 20 sets of spatially varying ground motion time histories are stochastically simulated. All the time histories are compatible with the Newmark-Hall design response spectrum with 5% d ing and normalized to 0.5g. The spatial variation of any two simulated time histories is compatible with an empirical coherency loss function. Coupled lateral-torsional-pounding responses of the two structures to the simulated ground motions are calculated. Discussions on the ground motion spatial variation effects are made.
Mechanical properties and behaviour of concrete reinforced with spiral-shaped steel fibres under dynamic splitting tension
Publisher: Thomas Telford Ltd.
Date: 11-2016
Abstract: Concrete exhibits excellent resistance to compressive forces, but is brittle and weak in tension. Various types of fibres have been investigated by many researchers to improve the ductility and energy absorption capability of concrete materials and structures under static and blast and impact loadings. Spiral-shaped steel fibres were recently proposed as reinforcement in a concrete matrix and it was found that spiral fibre reinforcement can significantly improve the ductility, crack control ability and energy absorption capacity of concrete material under static and impact compressive loads. This paper presents an experimental study of the static and dynamic properties of steel fibre reinforced concrete (SFRC) materials under splitting tension. SFRC materials mixed with spiral-shaped steel fibres of different volume fractions were prepared and tested. A high-speed camera was used to capture the deformation, failure and crack opening process of the tested specimens. The contribution of spiral fibres to the mechanical properties and behaviour of concrete at high strain rate under splitting tension was investigated. Analyses of the test results revealed the effectiveness of spiral fibres in improving the performance of SFRC (e.g. crack control, energy absorption capability and more pronounced rate sensitivity under dynamic splitting loading). Moreover, crack opening and closing (pull-back by spiral fibres) processes were observed, demonstrating the excellent bonding and outstanding performance of spiral steel fibres in maintaining the integrity of the concrete material, thus resulting in significant improvements in impact resistance and energy dissipation.
Damage detection in bridges under moving loads based on subspace projection residuals
Publisher: SAGE Publications
Date: 06-01-2022
DOI: 10.1177/13694332211056107
Abstract: This paper proposes a data-driven method using subspace projection residual of the responses to identify the damage locations in bridges subjected to moving loads. In this method, a moving window with a certain length determined by the s ling frequency and the fundamental frequency of the measured responses is used to cut out the acceleration responses of the bridge subjected to a moving vehicle. The characteristic subspaces of the windowed signals are subsequently extracted to calculate the local damage index using the subspace projection residual. When the window moves to the damage location, the orthogonality between the active subspace of the damaged state and the null subspace of the healthy state is invalid, which leads to a relatively large projection residual that can be used to localize the damage. To improve the reliability of the proposed approach, a one-side upper confidence limit is introduced. A simply supported beam bridge subjected to a moving mass is simulated to verify the effectiveness of the proposed method. Numerical results indicate that the proposed approach can accurately localize the single and multiple damages, even when the responses are smeared with a significant noise. Experimental tests conducted on a steel beam bridge model also demonstrate the performance and accuracy of the proposed approach. The results demonstrate that the proposed method can localize the damage even with a small number of sensors, indicating the method has a good and promising performance for practical engineering applications.
The mechanical performance of concrete shear key for prefabricated structures
Publisher: SAGE Publications
Date: 21-08-2021
Abstract: The mechanical performance of concrete connection plays an important role in the response of precast concrete structures. Unlike conventional small concrete shear key which is mainly to help with alignment at installation, large concrete shear keys have been often designed in recent engineering practice to improve joint shear resistance. However, the mechanical properties of large concrete shear keys have not been properly studied. This paper utilizes experimental and numerical methods to investigate both direct shear and flexural bending properties of shear keys. Four types of shear keys comprised of trapezoidal shape, semi-spherical shape, dome shape and wave shape are investigated, which are found to strongly influence the mechanical properties of the keyed joint. Laboratory shear test found unlike conventional shear key, with increased tenon size failure moves to concrete mortise. A detailed numerical model is built to help understand stress developed at the key joint. Flexural bending tests are carried out to evaluate the flexural bending properties of these key joints. Through comparing with theoretical derivation for plain flat joint, similar bending moment resistances from the keyed joints are measured with that of plain flat joint, but larger rotation angles are recorded probably because more damages at the key joint. Among the four different joint patterns, shear key with smoothed pattern could effectively relief concrete damages.
Structural damage detection based on the reconstructed phase space for reinforced concrete slab: Experimental study
Publisher: Elsevier BV
Date: 02-2013
Blast fragility analysis of RC columns considering chloride-induced corrosion of steel reinforcement
Publisher: Elsevier BV
Date: 05-2022
Numerical Analysis of Blast-Induced Stress Waves in a Rock Mass with Anisotropic Continuum Damage Models Part 1: Equivalent Material Property Approach
Publisher: Springer Science and Business Media LLC
Date: 05-2002
Dynamic compressive properties of novel lightweight ambient-cured EPS geopolymer composite
Publisher: Elsevier BV
Date: 03-2021
Dynamic interfacial bond behaviour between basalt fiber reinforced polymer sheets and concrete
Publisher: Elsevier BV
Date: 10-2020
Seismic Performance of Reinforced Concrete Buildings in Thimphu, Bhutan
Publisher: World Scientific Pub Co Pte Ltd
Date: 09-2017
DOI: 10.1142/S0219455417500742
Abstract: Inspite of its location in one of the most active seismic zones in the world, Bhutan has no seismic design code of its own and no detailed study on the performance of buildings under expected earthquake ground excitation has been carried out. In this study, probabilistic seismic hazard analysis is first carried out to predict the design ground motions in Thimphu, Bhutan for the return periods (RPs) of 475 and 2475 years. These ground motions are then used to assess the performance of three typical RC buildings in the capital city, Thimphu. Soil–structure interaction (SSI) is incorporated at different soil sites and the effects of SSI are discussed. Adequacy of using Indian Seismic Code in Bhutan is also studied and discussed. The study suggests that the typical buildings in Bhutan could undergo moderate to severe damages under the 475 year RP and could even collapse under the 2475 year RP ground motions. This study is the first such effort in predicting the design ground motions and then assessing the performance of the general building stocks in Bhutan. The result can guide the seismic preparedness of the country through proper design and mitigation measures.
Sensor Placement for Structural Damage Detection Considering Measurement Uncertainties
Publisher: SAGE Publications
Date: 05-2013
DOI: 10.1260/1369-4332.16.5.899
Abstract: Structural damage detection methods using vibration measurements have been developed for decades. Measurement selections may affect damage detection results, because inevitable uncertainties are involved in vibration testing. A new sensor placement index is defined as the ratio of two parameters, namely, the contribution of measurement points to a Fisher information matrix, and the damage sensitivity to the measurement noise. A large value of the contribution vector represents that the corresponding measurement points are sensitive to the damage and measurements at these points are more prominent for structural damage identification, whereas a small noise sensitivity value indicates measurement points that are less influenced by noises. Consequently, the points with large index values are chosen as the measurement subset. The effectiveness of the proposed technique is verified using a laboratory-tested steel frame. The damage detection using different measurement selection schemes shows that the present technique can identify multiple damages of the structure more accurately. The effect of the measurement number is also investigated.
Experimental and numerical study of unreinforced clay brick masonry walls subjected to vented gas explosions
Publisher: Elsevier BV
Date: 06-2017
Numerical analysis of steel tubular member response to ship bow impacts
Publisher: Elsevier BV
Date: 02-2014
Unified plastic limit analyses of circular plates under arbitrary load
Publisher: ASME International
Date: 06-1999
DOI: 10.1115/1.2791089
Numerical Analysis of Blast-Induced Stress Waves in a Rock Mass with Anisotropic Continuum Damage Models Part 2: Stochastic Approach
Publisher: Springer Science and Business Media LLC
Date: 05-2002
Basalt scale-reinforced aluminium foam under static and dynamic loads
Publisher: Elsevier BV
Date: 11-2018
Estimation of relative displacement of two adjacent asymmetric structures
Publisher: Wiley
Date: 2001
DOI: 10.1002/1096-9845(200101)30:1<81::AID-EQE997>3.0.CO;2-E
Dynamic buckling and post-buckling of imperfect columns under fluid-solid interaction
Publisher: Elsevier BV
Date: 11-2001
The mechanical properties of Polyvinyl Butyral (PVB) at high strain rates
Publisher: Elsevier BV
Date: 09-2015
Impact load mitigation of meta-panels with single local resonator
Publisher: Elsevier BV
Date: 08-2022
Inelastic analysis of steel frames with reduced beam sections
Publisher: Wiley
Date: 2001
DOI: 10.1002/TAL.173
Pullout and flexural performance of silane groups and hydrophilic groups grafted polypropylene fibre reinforced UHPC
Publisher: Elsevier BV
Date: 03-2021
Energy approach in performance-based seismic design of steel moment resisting frames for basic safety objective
Publisher: Wiley
Date: 2001
DOI: 10.1002/TAL.172
Characteristics of surface ground motions induced by blast in jointed rock mass
Publisher: Elsevier BV
Date: 02-2001
Research at the University of Western Australia on structure protections against blast and impact loads
Publisher: Informa UK Limited
Date: 2012
Nonlinear seismic response of a base isolated single pylon cable-stayed bridge
Publisher: Elsevier BV
Date: 11-2018
Dynamic Tensile Properties of Clay Bricks
Publisher: Elsevier BV
Date: 02-2022
3D FEM Analysis of Pounding Response of Bridge Structures at a Canyon Site to Spatially Varying Ground Motions
Publisher: SAGE Publications
Date: 04-2013
DOI: 10.1260/1369-4332.16.4.619
Abstract: Previous studies of pounding responses of adjacent bridge structures under seismic excitation were usually based on the simplified lumped mass model or beam-column element model. Consequently, only 1D point to point pounding, which is usually in the longitudinal direction of the bridge, could be considered. In reality, pounding could occur along the entire surfaces of the adjacent bridge structures. Moreover, spatially varying transverse ground motions generate torsional responses of bridge decks and these responses may cause eccentric poundings. That is why many pounding damages occurred at corners of the adjacent decks as observed in almost all previous major earthquakes. A simplified 1D model cannot capture torsional response and eccentric poundings. To more realistically investigate pounding between adjacent bridge structures, a two-span simply-supported bridge structure located at a canyon site is established with a detailed 3D finite element model in the present study. Spatially varying ground motions in the longitudinal, transverse and vertical directions at the bridge supports are stochastically simulated as inputs in the analysis. The pounding responses of the bridge structure under multi-component spatially varying ground motions are investigated in detail by using the finite element code LS-DYNA. Numerical results show that the detailed 3D finite element model clearly captures the eccentric poundings of bridge decks, which may induce local damage around the corners of bridge decks. It demonstrates the necessity of detailed 3D modelling for a more realistic simulation of pounding responses of adjacent bridge decks to earthquake excitations.
Ground-motion spatial variation effects on circular arch responses
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-1994
Cyclic friction-slip behaviour of G350-steel bolted connections
Publisher: Elsevier BV
Date: 05-2023
Residual Loading Capacity of Ultra-High Performance Concrete Columns After Blast Loads
Publisher: SAGE Publications
Date: 12-2015
DOI: 10.1260/2041-4196.6.4.649
Abstract: Columns are essential load carrying structural components and may experience accidental loads such as terrorist bombing attacks during their service life. Damages to columns may trigger structural collapse and it is therefore very important to protect critical load-carrying columns. In recent studies, a novel ultra-high performance concrete (UHPC) material was developed and static loading test results revealed its outstanding mechanical strengths and ductility. The present study investigates the blast load-carrying capacities of columns made of UHPC. Concrete columns built with UHPC were blast tested in the field first then brought back to laboratory and subjected to static load tests to determine their residual load-carrying capacities after experiencing varying levels of blast damage. The results from the field blast tests and laboratory static load tests for residual load-carrying capacities are presented and discussed in this paper. Numerical models for simulating responses and residual strengths of the UHPC columns after blast loadings are also developed in commercial hydro-code LS-DYNA and presented in the paper. Comparisons between the test data and numerical results are made and the accuracy of the numerical model is validated.
Development of pressure-impulse curves for fiber reinforced polymer strengthened reinforced concrete walls
Publisher: CRC Press
Date: 18-11-2011
DOI: 10.1201/B10571-86
Effect of rubber aggregate size on static and dynamic compressive properties of rubberized concrete
Publisher: Wiley
Date: 09-07-2022
Abstract: This study experimentally examines the effect of rubber aggregate size on the static and dynamic behavior of rubberized concrete. Rubberized concrete specimens were prepared with different maximum rubber aggregate sizes ranging from 1 to 3 mm to 3 to 5 mm while the rubber content was kept constant at 15% by volume. The dynamic compressive behavior of rubberized concrete was investigated by using split Hopkinson pressure bar (SHPB) tests. The experimental results have shown that rubberized concrete with smaller rubber aggregates showed higher static compressive strength as compared to that with larger rubber aggregates. Meanwhile, the rubber aggregate size did not considerably affect the density of rubberized concrete. The use of smaller rubber aggregate size mitigated the slump reduction of rubberized concrete. Rubberized concrete exhibited obvious sensitivity to strain rate and those with larger rubber aggregates showed higher strain rate sensitivity. The progressive damage of rubberized concrete showed more ductile behavior with bulging failure, which was different from the typical concrete under compression. In general, the use of smaller rubber aggregate size was beneficial to the static compressive strength but less effective to the dynamic compressive strength of rubberized concrete as compared to those with larger rubber aggregates.
Physical and mechanical properties of quaternary blended concrete with recycled coarse aggregates and crushed waste glass
Publisher: Elsevier BV
Date: 10-2022
Quantitative X-ray diffraction phase analysis of poorly ordered nontronite clay in nickel laterites
Publisher: International Union of Crystallography (IUCr)
Date: 18-08-2011
DOI: 10.1107/S0021889811027786
Abstract: Studies of the extraction of nickel from low-grade laterite ores require a much better quantitative understanding of the poorly ordered mineral phases present, including turbostratically disordered nontronite. Whole pattern refinements with nontronite X-ray diffraction data from a Western Australian nickel deposit (Bulong) using a nontronite lattice model (Pawley phase) with two space groups ( P 3 and C 2/ m ) and a peaks phase group model were performed to improve the accuracy of quantitative X-ray diffraction of nickel laterite ore s les. Modifications were applied when building the new models to accommodate asymmetric peak shape and anisotropic peak broadening due to the turbostratic disorder. Spherical harmonics were used as convolution factors to represent anisotropic crystal size and strain and asymmetric peak shape when using the lattice model. A peaks phase group model was also developed to fit the anisotropic peak broadening in the nontronite pattern. The quantitative results of the new Pawley phase and peaks phase group models were compared and verified with synthetic mixtures of nontronite, quartz and goethite simulating various West Australian laterite ore compositions. The models developed in this paper demonstrate adequate accuracy for quantification of nontronite in the synthesized reference materials and should be generally applicable to quantitative phase analysis of nontronite in nickel laterite ore s les.
Time-varying system identification using a newly improved HHT algorithm
Publisher: Elsevier BV
Date: 12-2009
Dynamic responses and failure modes of bridge columns under vehicle collision
Publisher: Elsevier BV
Date: 02-2018
Building vibration to traffic-induced ground motion
Publisher: Elsevier BV
Date: 04-2001
RIGID STRUCTURE RESPONSE ANALYSIS TO SEISMIC AND BLAST INDUCED GROUND MOTIONS
Publisher: Elsevier BV
Date: 2011
Experimental study of reinforced concrete beams reinforced with hybrid spiral-hooked end steel fibres under static and impact loads
Publisher: SAGE Publications
Date: 06-07-2022
DOI: 10.1177/13694332221113045
Abstract: Discrete short steel fibres were proposed to be mixed with concrete for arresting cracks and enhancing the post-cracking resistance. It has been proven in previous tests that spiral steel fibres possessed markedly higher bonding to concrete matrix, leading to significantly improved performance of steel fibre reinforced concrete (SFRC) in terms of crack controllability, impact resistance, deformability and energy absorption capability. However, at the initial stage of cracking, SFRC reinforced with spiral fibres has relatively lower resistance to crack opening as compared to that reinforced with other types of steel fibres because of spiral shape stretching. To overcome this shortcoming, in the present study, short hooked-end steel fibres that exhibit high pull-out resistance at the crack initiation stage were mixed with spiral steel fibres in the normal-strength concrete matrix. A total volume fraction of 1% of hybrid steel fibres was mixed to cast SFRC specimens. With various mix ratios between spiral and hooked-end fibres considered, five batches of SFRC specimens were tested. Uniaxial compressive tests and four-point bending tests were carried out to compare the mechanical properties of SFRC materials with hybrid fibres while three-point bending tests on SFRC structural beams under static, drop-weight impact and post-impact static loading tests were conducted to investigate the structural performances. An equal dosage of hooked-end and spiral fibres was found to outperform other blend proportions to provide synergetic reinforcement to concrete matrix in terms of post-cracking resistance, energy absorption capacity and post-impact performance.
Numerical simulation of damage of low-rise RC frame structures with infilled masonry walls to explosive loads
Publisher: Informa UK Limited
Date: 2006
Spallation of reinforced concrete slabs under contact explosion
Publisher: IEEE
Date: 2016
Prediction of BLEVE blast loading using CFD and artificial neural network
Publisher: Elsevier BV
Date: 05-2021
Dynamic compressive properties of reinforced and kirigami modified honeycomb in three axial directions
Publisher: Elsevier BV
Date: 02-2022
Numerical investigation of the failure mechanism of concrete specimens under tri-axial dynamic loads
Publisher: Elsevier BV
Date: 05-2022
Review of the current practices in blast-resistant analysis and design of concrete structures
Publisher: SAGE Publications
Date: 28-07-2016
Abstract: In contemporary society, industrialization and rising of terrorism threats highlight the necessity and importance of structural protection against accidental and intentionally malicious blast loads. Consequences of these extreme loading events are known to be catastrophic, involving personnel injuries and fatalities, economic loss and immeasurable social disruption. These impacts are generated not only from direct explosion effects, that is, blast overpressure and primary or secondary fragments, but also from the indirect effects such as structural collapse. The latter one is known to be more critical leading to massive losses. It is therefore imperative to enlighten our structural engineers and policy regulators when designing modern structures. Towards a better protection of concrete structures, efforts have been devoted to understanding properties of construction materials and responses of structures subjected to blast loads. Reliable blast resistance design requires a comprehensive knowledge of blast loading characteristics, dynamic material properties and dynamic response predictions of structures. This article presents a state-of-the-art review of the current blast-resistant design and analysis of concrete structures subjected to blast loads. The blast load estimation, design considerations and approaches, dynamic material properties at high strain rate, testing methods and numerical simulation tools and methods are considered and reviewed. Discussions on the accuracies and advantages of these current approaches and suggestions on possible improvements are also made.
Test of Dynamic Mechanical Properties of Ambient-Cured Geopolymer Concrete Using Split Hopkinson Pressure Bar
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2022
Reliability Analysis of RC Columns and Frame with FRP Strengthening Subjected to Explosive Loads
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2016
A three-phase soil model for simulating stress wave propagation due to blast loading
Publisher: Wiley
Date: 09-12-2004
DOI: 10.1002/NAG.325
Damage assessment of a two-span RC slab using wavelet analysis
Publisher: SPIE
Date: 06-04-2007
DOI: 10.1117/12.713998
Dynamic compressive properties of lightweight rubberized concrete
Publisher: Elsevier BV
Date: 03-2020
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