ORCID Profile
0000-0001-9933-8156
Current Organisation
Curtin University
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Civil Engineering | Structural Engineering | Construction Materials | Structural engineering | Civil engineering |
Commercial Construction Design | Expanding Knowledge in Engineering | Civil Construction Design | Industrial Construction Design | Expanding Knowledge in Technology
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 08-2023
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-2022
Publisher: Elsevier BV
Date: 10-2023
Publisher: Elsevier BV
Date: 08-2021
Publisher: Elsevier BV
Date: 02-2016
Publisher: Elsevier BV
Date: 06-2022
Publisher: Elsevier BV
Date: 12-2021
Publisher: World Scientific Pub Co Pte Ltd
Date: 27-03-2023
DOI: 10.1142/S021945542350178X
Abstract: A number of recent studies have demonstrated numerically and experimentally that metaconcrete made of engineered aggregates can mitigate the propagation of stress waves induced by impulsive load. The energy imparted into the metaconcrete structure from impulsive load can be absorbed by engineered aggregates because of the local vibration of heavy cores. The previous studies considered simple 1D metaconcrete bar structure to investigate its effectiveness on mitigating stress wave propagations. The performance of structural components made of metaconcrete under impulsive load has not been investigated yet. In this study, 3D meso-scale models of three typical beams, namely, normal concrete (NC) beam, normal metaconcrete (NMC) beam composed of normal engineered aggregates (NEA) and enhanced metaconcrete (EMC) beam composed of enhanced engineered aggregates (EEA) are generated to investigate the responses of beam structure subjected to impulsive loading. The engineered aggregates NEA and EEA are designed via the software COMSOL to have the bandgaps coincident with the primary frequencies of stress wave generated in NC beam by the considered impulsive loads. Dynamic responses of three beams subjected to near-field blast loads with different scaled distances are studied via the software LS-DYNA. It is found that the EMC beam experiences less compressive and spalling damage than NC and NMC beams subjected to near-field explosion with the scaled distance of 0.15[Formula: see text]m/kg[Formula: see text]. Under blast loading from larger scaled distance explosions, the EMC beam experiences less severe flexural and flexural-shear damage than NC and NMC beams. It can be concluded that the EMC beam demonstrates better blast-resistance performance than NC and NMC beams.
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2020
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.
Publisher: Elsevier BV
Date: 08-2014
Publisher: Elsevier BV
Date: 09-2023
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-2022
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 10-2023
Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier BV
Date: 05-2022
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 09-2022
Publisher: SAGE Publications
Date: 29-05-2022
Publisher: Elsevier BV
Date: 03-2023
Publisher: Elsevier BV
Date: 07-2016
Publisher: Elsevier BV
Date: 10-2022
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.
Publisher: Elsevier BV
Date: 06-2021
Publisher: Elsevier BV
Date: 05-2022
Publisher: Elsevier BV
Date: 04-2023
Publisher: World Scientific Pub Co Pte Lt
Date: 06-04-2017
DOI: 10.1142/S0219455417500535
Abstract: A simply supported reinforced concrete (RC) beam only experiences sagging moment under static loads while it might experience both sagging and hogging moments under impact loads due to the inertial effect. In order to investigate inertial effect on the impact behavior of RC beam, a numerical model is developed by using the finite element code LS-DYNA. The strain rate effect of the material is considered in the numerical model. The numerical model is calibrated with the testing results of drop weight impact on RC beams available in the literature. The numerical results show that the prediction is better than some other researchers’ predictions in terms of peak impact force and peak deformation. In addition, inertial effect is quantitatively evaluated by the peak impact force and the peak hogging moment. The relationship between the peak hogging moment and the peak impact force of the beam is investigated by conducting parametric studies with regard to various net spans, impact masses and impact velocities. The empirical formulae are then proposed to predict the peak impact force and the peak hogging moment. The predications by the proposed empirical formulae are compared with the testing results and the predicted results by other formulae available in the literatures.
Publisher: Informa UK Limited
Date: 15-12-2023
Publisher: SAGE Publications
Date: 09-01-2018
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 04-2023
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.
Publisher: Elsevier BV
Date: 11-2019
Publisher: Springer Science and Business Media LLC
Date: 26-11-2022
Publisher: Elsevier BV
Date: 09-2020
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 09-2020
Publisher: Thomas Telford Ltd.
Date: 11-2019
Abstract: Substantial damage to buildings from seismic pounding is the result of earthquakes in many urban areas. This study investigated the effects of pounding in low-rise buildings, which had been in idually designed for seismic resistance, using a three-dimensional numerical model. The pounding between the heavier and lighter buildings was conducted for four cases with floor to floor collision and zero separation gap the total heights of the buildings were varied. The ratio of the storey mass between the heavier to the lighter buildings in all cases was 1·7. The results demonstrated that the heavier buildings were almost unaffected by the collision, and that seismic design without consideration of pounding is acceptable. However, the pounding had more influence on lighter buildings. A significant increase of inter-storey drift and the storey shear force was found. At the top floor of the lighter building, the inter-storey drift and the storey shear force were increased in the range of 35–73% and 20–46%, respectively, compared with no-pounding events. In addition, severe damage at beam–column joints was found. Hence, lighter buildings require special attention during a seismic pounding event.
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.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2020
Publisher: Elsevier BV
Date: 2020
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 03-2015
Publisher: Elsevier BV
Date: 03-2016
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 2023
Publisher: IOP Publishing
Date: 19-02-2020
Publisher: Elsevier BV
Date: 08-2022
Publisher: Elsevier BV
Date: 2015
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 11-2021
Publisher: Elsevier BV
Date: 08-2020
Publisher: Elsevier BV
Date: 2023
Publisher: Elsevier BV
Date: 08-2019
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 04-2020
Publisher: Elsevier BV
Date: 04-2027
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.
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 06-2021
Publisher: Springer Science and Business Media LLC
Date: 10-08-2016
Publisher: Elsevier BV
Date: 2022
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-2019
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 05-2012
Publisher: Elsevier BV
Date: 08-2021
Publisher: Elsevier BV
Date: 11-2023
Publisher: Elsevier BV
Date: 11-2019
Publisher: Springer Science and Business Media LLC
Date: 24-08-2020
Publisher: Elsevier BV
Date: 09-2019
Publisher: SAGE Publications
Date: 19-07-2018
Abstract: With the increasing popularity of high-speed railway, more and more bridges are being constructed in Western China where debris flows are very common. A debris flow with moderate intensity may endanger a high-speed train traveling on a bridge, since its direct impact leads to adverse dynamic responses of the bridge and the track structure. In order to address this issue, a dynamic analysis model is established for studying vibrations of coupled train–track–bridge system subjected to debris flow impact, in which a model of debris flow impact load in time domain is proposed and applied on bridge piers as external excitation. In addition, a six-span simply supported box girder bridge is considered as a case study. The dynamic responses of the bridge and the running safety indices such as derailment factor, offload factor, and lateral wheel–rail force of the train are investigated. Some influencing factors are then discussed based on parametric studies. The results show that both bridge responses and running safety indices are greatly lified due to debris flow impact loads as compared with that without debris flow impact. With respect to the debris flow impact load, the boulder collision has a more negative impact on the dynamic responses of the bridge and train than the dynamic slurry pressure. Both the debris flow impact intensity and train speed determine the running safety indices, and the debris flow occurrence time should be also carefully considered to investigate the worst scenario.
Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 07-2022
Publisher: Elsevier BV
Date: 09-2018
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 10-2019
Publisher: Elsevier BV
Date: 07-2023
Publisher: Elsevier BV
Date: 07-2017
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 03-2021
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.
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 10-2023
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 11-2018
Publisher: Elsevier BV
Date: 08-2023
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 12-2023
Publisher: Elsevier BV
Date: 08-2023
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 10-2023
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.
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 02-2022
Publisher: Elsevier BV
Date: 05-2022
Publisher: Elsevier BV
Date: 02-2020
Publisher: Elsevier BV
Date: 05-2021
Publisher: Elsevier BV
Date: 10-2023
Publisher: Elsevier BV
Date: 07-2019
Publisher: Springer Singapore
Date: 23-12-2020
Publisher: Elsevier BV
Date: 06-2018
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.
Publisher: Elsevier BV
Date: 07-2020
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.
Publisher: Elsevier BV
Date: 11-2015
Publisher: Elsevier BV
Date: 10-2018
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.
Publisher: Elsevier BV
Date: 09-2020
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 08-2022
Publisher: Elsevier BV
Date: 2024
Publisher: Elsevier BV
Date: 03-2018
Publisher: Elsevier BV
Date: 07-2012
Publisher: Informa UK Limited
Date: 24-02-2020
Publisher: Elsevier BV
Date: 10-2022
Publisher: Elsevier BV
Date: 08-2022
Publisher: Elsevier BV
Date: 10-2022
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 08-2021
Publisher: Elsevier BV
Date: 05-2019
Publisher: Elsevier BV
Date: 07-2019
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 08-2021
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 12-2021
Publisher: Science China Press., Co. Ltd.
Date: 10-10-2020
Publisher: Elsevier BV
Date: 07-2019
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 12-2022
Publisher: Elsevier BV
Date: 03-2021
Publisher: Springer Singapore
Date: 04-09-2020
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.
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 10-2022
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.
Publisher: Elsevier BV
Date: 10-2022
Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 10-2019
Publisher: Elsevier BV
Date: 02-2022
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.
Publisher: Hindawi Limited
Date: 13-04-2021
DOI: 10.1002/STC.2741
Publisher: Elsevier BV
Date: 06-2020
Publisher: SAGE Publications
Date: 05-07-2022
DOI: 10.1177/13694332221113041
Abstract: A square concrete-filled double steel tubular (CFDST) column composed of a circular core concrete-filled tube offers the advantages of both square and circular concrete-filled steel tubular (CFST) columns. However, limited tests were performed to investigate the axial performance of CFDST slender columns. This paper investigates the behavior and design of square CFDST slender columns subjected to concentric loading. A total of eight columns, including six CFDST slender columns and two CFDST short columns were tested under concentric loading. The test parameter includes the slenderness ratio of the columns and the thickness of the inner tube. The ultimate load, failure modes and axial load-deflection relationships of CFDST slender columns are presented. It was observed that square CFDST slender columns failed due to the overall buckling of the columns together with the localized buckling of the steel tube and concrete crushing. Increasing the slenderness ratio and decreasing the thickness of the inner steel tube reduced the ultimate load of CFDST slender columns. The applicability of the existing design code of CFST columns in designing CFDST slender columns was evaluated. It was found that the existing design codes significantly underestimated the ultimate loads of CFDST columns.
Publisher: Elsevier BV
Date: 06-2019
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2021
Publisher: Elsevier BV
Date: 09-2019
Publisher: Elsevier BV
Date: 08-2021
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 2022
Publisher: Elsevier BV
Date: 07-2023
Publisher: Elsevier BV
Date: 02-2015
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 02-2022
Publisher: Elsevier BV
Date: 02-2021
Publisher: Oxford University Press (OUP)
Date: 23-06-2021
Abstract: Myocardial fibrosis is associated with clinical ventricular tachyarrhythmia (VTA) events in patients with non-ischaemic dilated cardiomyopathy (DCM). Subepicardial or mid-wall ring-like late gadolinium enhancement (LGE) has received increasing attention in recent years. The aim of this study was to investigate the relationship between ring-like LGE and VTAs in DCM. Patients diagnosed with non-ischaemic DCM who underwent cardiac magnetic resonance with LGE imaging at baseline were investigated. The composite outcome was the occurrence of VTAs defined as sustained ventricular tachycardia, ventricular fibrillation/flutter, aborted sudden cardiac death (SCD), SCD, and appropriate implantable cardioverter-defibrillator intervention. The final cohort comprised 157 patients, including 36 (22.9%) in no LGE group, 48 (30.6%) in focal LGE group, 40 (25.5%) in multi-focal LGE group, and 33 (21%) in ring-like LGE group. Ring-like LGE group patients were younger compared to focal and multi-focal LGE group (P & 0.001) with higher left ventricular ejection fraction (33.0% vs. 24.4% vs. 22.1%, P & 0.001). After a median of 13 ± 7 months follow-up, compared to patients with no LGE, the hazard ratios (HRs) with 95% confidence intervals (CIs) for VTAs were 2.90 (0.56–15.06), 5.55 (1.21–25.44), and 11.75 (2.66–51.92) for patients with focal LGE, multi-focal LGE, and ring-like LGE, respectively. After multivariable adjustment, ring-like LGE group remained associated with increased risk of VTAs (adjusted HR 10.00, 95% CI 1.54–64.98 P = 0.016) independent of the global LGE burden The ring-like pattern of LGE is independently associated with an increased risk of VTAs in patients with non-ischaemic DCM.
Publisher: Elsevier BV
Date: 12-2020
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2022
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.
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2023
Publisher: Elsevier BV
Date: 08-2023
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2018
Publisher: Elsevier BV
Date: 11-2022
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.
Publisher: Elsevier BV
Date: 09-2014
Publisher: Elsevier BV
Date: 2022
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 07-2019
Publisher: Elsevier BV
Date: 12-2023
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 10-2023
Start Date: 2023
End Date: 2026
Funder: Australian Research Council
View Funded ActivityStart Date: 2022
End Date: 12-2025
Amount: $873,160.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2016
End Date: 03-2021
Amount: $300,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 10-2015
End Date: 12-2020
Amount: $210,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2023
End Date: 12-2026
Amount: $520,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 12-2022
End Date: 12-2025
Amount: $363,000.00
Funder: Australian Research Council
View Funded Activity