ORCID Profile
0000-0003-2868-7505
Current Organisations
Griffith University Griffith Sciences
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Griffith University
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Sustainable design | Timber engineering | Automation and technology in building and construction | Building |
Publisher: Elsevier BV
Date: 12-2022
Publisher: MDPI AG
Date: 10-07-2023
DOI: 10.3390/BUILDINGS13071756
Abstract: Floor vibration, although not a safety concern, is a prevalent performance complaint in multi-story structures. With the increasing use of mass timber construction, various types of long-span timber floors (LSTFs), including plain cross-laminated timber (CLT), CLT with secondary beams (ribbed-deck), and hybrid systems such as timber–concrete composite (TCC) and CLT on-steel-support beams, are gaining popularity. However, due to limited knowledge regarding their vibration characteristics and acceptance criteria, these construction types are often overlooked during the design stage by architects, engineers, and builders. Existing standards and guidelines primarily calibrated for steel and concrete floors lack a validated and calibrated method for evaluating the vibration performance of LSTFs. Nonetheless, it is essential for structural engineers to address vibration concerns during the design stage and potentially investigate excessive vibration in existing buildings, providing mitigation solutions. This article provides a comprehensive overview, discussion, and analysis of the measurement, analysis, design, perception, and acceptability of vibration of timber floors as outlined in international standards and commonly used guidelines. Experimental and theoretical case studies, including vibration measurements of a CLT floor and a comparison of vibration acceptability in lightweight timber floors using different methods, are reported. The results highlight discrepancies between simplified equation calculations and modal analysis observations, underscoring the limitations of relying solely on simplified equations. Furthermore, it is observed that current modal superposition methods tend to be conservative in predicting floor acceleration and velocity responses. Recommendations are provided for future research in the field to enhance floor vibration assessment techniques, aiming for improved design optimization and occupant comfort.
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2017
Publisher: MDPI AG
Date: 26-02-2023
DOI: 10.3390/JMSE11030510
Abstract: The potential collision between the ship and the pipe piles of the jacket structure brings huge risks to the safety of an offshore platform. Due to their high energy-absorbing capacity, honeycomb structures have been widely used as impact protectors in various engineering applications. This paper proposes a data-driven intelligent approach for the prediction of the collision response of honeycomb-reinforced structures under ship collision. In the proposed model, the artificial neural network (ANN) is combined with the dynamic particle swarm optimization (DPSO) algorithm to predict the collision responses of honeycomb reinforced pipe piles, including the maximum collision depth (δmax) and maximum absorption energy (Emax). Furthermore, a data-driven evaluation method, known as grey relational analysis (GRA), is proposed to evaluate the collision responses of the honeycomb-reinforced pipe piles of offshore platforms. Results of the case study demonstrate the accuracy of the DPSO-BP-ANN model, with measured mean-square-error (MSE) of 5.06 × 10−4 and 4.35 × 10−3 and R2 of 0.9906 and 0.9963 for δmax and Emax, respectively. It is shown that the GRA method can provide a comprehensive evaluation of the performance of a honeycomb structure under impact loads. The proposed model provides a robust and efficient assessment tool for the safe design of offshore platforms under ship collisions.
Publisher: Research in Enineering Education Network (REEN)
Date: 2022
DOI: 10.52202/066488-0061
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 06-2021
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 07-2013
Publisher: CRC Press
Date: 13-11-2017
Publisher: American Society of Mechanical Engineers
Date: 09-06-2013
Abstract: The paper investigates the interaction between propagation buckling and lateral buckling in deep subsea pipelines. Lateral buckling is a possible global buckling mode in long pipelines while the propagation buckling is a local mode that can quickly propagate and damage a long segment of a pipeline in deep water. A numerical study is conducted to simulate buckle interaction in deep subsea pipelines. The interaction produces a significant reduction in the buckle design capacity of the pipeline. This is further exasperated due to the inherent imperfection sensitivity of the problem.
Publisher: Elsevier BV
Date: 05-2014
Publisher: Elsevier BV
Date: 04-2021
Publisher: American Society of Mechanical Engineers
Date: 09-06-2019
Abstract: This paper experimentally investigates the feasibility and efficiency of using Carbon Fiber Reinforced Polymer (CFRP) buckle arrestors in controlling the buckle propagation failure of subsea pipelines. Hyperbaric chamber tests are conducted on 1.6m Steel pipe with D/t = 28 and using CFRP buckle arrestors with different thickness, fiber orientation and spacing. Using an external pressure gauge and a high-pressure camera inserted inside the hyperbaric chamber, the pressure magnitude, rate and shape of collapse and its propagation in the vicinity of the arrestors are measured. The dynamics of buckle propagation and efficiency of different arrestor configurations are reported. It is observed that in the vicinity of the CFRP arrestors wrapped in the hoop direction, the well-known dog-bone buckle shape changes into a U-shape and the pressure level upsurges significantly. The optimum results were obtained with CFRP as thick as the pipeline wall-thickness and wrapped in the hoop direction of the pipeline. The results show that at similar arrestor efficiency, the CFRP arrestors can be much thinner than the existing steel slip-on arrestors. Also, the spacing between the CFRP arrestor can be larger than that of the steel slip-on arrestor.
Publisher: Elsevier BV
Date: 06-2023
Publisher: Springer Singapore
Date: 04-09-2020
Publisher: Elsevier BV
Date: 10-2022
Publisher: Forest Products Society
Date: 03-2021
Abstract: Transverse modal analysis of timber panels is a proven effective alternative method for approximating a material's elastic constants. Specific testing configurations, such as boundary conditions (BC) and location of sensor and impact, play a critical role in the accuracy of the results obtained from the experimental assessment. This article investigates signal-specific details, such as the signal quality factor, that directly relate to the d ing properties and internal friction as well as frequency shifting obtained from six different BCs. A freely supported (FFFF), opposing minor sides (shorter length) simply supported, and major sides (longest length) free (SFSF), as well as the reverse of the SFSF configuration with minor sides free and major lengths simply supported (FSFS) and all sides simply supported (SSSS) setup, are investigated. Variations into the proposed methods used to achieve an FFFF supported system are also considered. A combination of experimental testing in parallel with finite element analysis was conducted to re-create the setup that would be used within a manufacturing facility for nondestructive assessment of full-size cross-laminated timber panels. The differences between all BC configurations for their resonance frequency quality and location indicate that a freely supported system provides higher-resolution results, good comparison of less than 10 percent error with the finite element analysis and experimental results, and advantages in a simple experimental setup for the intended application.
Publisher: ASME International
Date: 10-02-2022
DOI: 10.1115/1.4052475
Abstract: A series of physical tests and finite element (FE) analyses are conducted to evaluate the failure of smooth (conventional) and textured (proposed concept) pipes. To do so, hydrostatic pressure tests are performed on aluminum beverage cans (ductile failure) and additively manufactured Ti6Al4V-0406 titanium pipes (brittle failure). Mechanical material properties are obtained from tensile tests of coupon s les. In the absence of physical burst pressure tests, FE models are validated against experimental results of external pressure tests and are used to predict the buckle initiation (Pi) and burst pressure (Pb) capacity of the textured pipes with different number of circumferential triangles, N, and base angles, α. Results show that buckle initiation pressures of the textured concept is 2.34 and 1.80 times greater than those of the smooth aluminum cans and titanium pipes, respectively. However, the burst pressure of the textured pipe can only get 3% greater than the smooth pipe. Based on the current results, a textured pipe with N = 6 and α = 30 deg is the optimum textured design.
Publisher: Springer Singapore
Date: 23-12-2021
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2018
Publisher: Elsevier BV
Date: 06-2020
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2020
Publisher: Penerbit Universiti Sains Malaysia
Date: 30-07-2021
Abstract: The importance of digital skills diffusion in fostering the architecture, engineering and construction (AEC) industry has been highlighted for more than a decade. The extent to which this objective can be achieved depends on several factors. An augmented building information modelling (BIM) adoption stems from, but is not restricted to, government policies and initiatives. This study aims to assess the diffusion of digital skills, specifically through BIM adoption and to establish feasible strategies for such adoption within the Italian AEC industry, taking into account institutional, organisational and project-related factors. This purpose is achieved through an initial investigation of the most significant hurdles in BIM uptake and various BIM-promoting policies adopted at an international level. Moreover, a rigorous review of recent developments in the diffusion of innovation theory is presented. Based on findings and combining the experiences of various authors in BIM-related research an exploratory online survey was conducted, resulting in identification of the clients' lack of knowledge as the most critical challenge to BIM adoption in the Italian AEC industry. Following this finding, the study suggests five strategies to leverage BIM benefits to their full extent, to increase the perception of BIM benefits and to bridge the current gap between the industry and academia.
Publisher: World Conference on Timber Engineering (WCTE 2023)
Date: 2023
DOI: 10.52202/069179-0064
Publisher: IntechOpen
Date: 19-02-2020
Publisher: Springer Singapore
Date: 04-09-2020
Publisher: Elsevier BV
Date: 03-2020
Publisher: American Society of Mechanical Engineers
Date: 31-05-2015
Abstract: Novel analytical solution to lateral buckling of pipelines based on localization of buckle patterns is proposed. Finite element study is conducted on lateral buckling of a full length pipe. Analytical and FE results are compared and advantages of analytical solution to FE model are highlighted. Interaction between lateral buckling and propagation buckling of cylindrical pipe and textured pipe under transient load path are investigated.
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 07-2021
Publisher: Trans Tech Publications, Ltd.
Date: 05-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.553.434
Abstract: Due to high service temperatures and internal pressures in oil and gas pipelines, axial compression forces are induced in the pipe due to seabed friction. Slender trenched pipelines can experience global buckling in the vertical plane (upheaval buckling) while untrenched pipelines buckle in the horizontal plane (lateral buckling). Furthermore, deep subsea pipelines subjected to high external hydrostatics pressures can undergo catastrophic propagation buckling. In this study, the possible interaction between upheaval/lateral buckling and propagation buckling is numerically investigated using finite element analysis. A new concept is proposed for subsea pipelines design that gives higher capacity than conventional pipelines.
Publisher: Elsevier BV
Date: 08-2020
Publisher: Springer Science and Business Media LLC
Date: 09-10-2023
Publisher: Springer Science and Business Media LLC
Date: 06-02-2020
Publisher: Elsevier BV
Date: 04-2021
Publisher: MDPI AG
Date: 26-08-2022
DOI: 10.3390/JMSE10091194
Abstract: The collision between the pipe legs of jacket platforms and bypassing ships is of great concern for the safety assessment of platforms. Honeycomb structures have been widely used owing to their unique deformation and mechanical properties under dynamic impact loads. In this paper, two typical honeycomb structures, namely hexagonal honeycomb and arrow honeycomb, were constructed for the impact protection of inclined pipe legs in jacket platforms, and the present study aimed to assess the dynamical performance and crushing resistance of the designed honeycomb reinforced structure under ship collision by using the numerical simulation software ANSYS/LS-DYNA. The dynamical performance of the honeycomb reinforced pipe leg was investigated considering various influential parameters, including the impact velocity and impact direction. The crashworthiness of the two types of honeycomb was evaluated and compared by different criteria, namely the maximum impact depth (δmax), specific energy absorption (SEA) and the proposed index offset sliding (OS). The results demonstrated that both the hexagonal honeycomb structure and the arrow honeycomb structure can reduce the damage of inclined pipe legs caused by ship collision, while the hexagonal honeycomb can provide the better anti-collision capacity, which can well reduce the offset sliding and better protect the pipe leg from ship collision.
Publisher: Elsevier BV
Date: 04-2020
Publisher: Elsevier BV
Date: 09-2011
Publisher: Elsevier BV
Date: 11-2013
Publisher: MDPI AG
Date: 28-05-2020
DOI: 10.3390/JMSE8060387
Abstract: Vortex-induced vibrations (VIV) of hexagonal cylinders at Reynolds number of 1000 and mass ratio of 2 are studied numerically. In the numerical model, the Navier–Stokes equations are solved using finite volume method, and the fluid-structure interaction (FSI) is modelled using Arbitrary Lagrangian Eulerian (ALE) Scheme. The numerical model accounts for the cross-flow vibration of the cylinders, and is validated against published experimental and numerical results. In order to account for different angles of attack, the hexagonal cylinders are studied in the corner and face orientations. The results are compared with the published results of circular and square cylinders. Current results show that within the studied range of reduced velocities (up to 20), unlike circular and square cylinders, no lock-in response is observed in the hexagonal cylinders. The maximum normalized VIV litudes of the hexagonal cylinders are 0.45, and are significantly lower than those of circular and square cylinders. Vortex shedding regimes of the corner-oriented hexagons are mostly irregular. However, in the face-oriented hexagons, the shedding modes are more similar to the typical P + S and 2P modes.
Publisher: American Society of Mechanical Engineers
Date: 11-06-2023
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 10-2020
Publisher: Springer Science and Business Media LLC
Date: 18-05-2023
Publisher: Elsevier BV
Date: 10-2023
Publisher: Thomas Telford Ltd.
Date: 09-2018
Abstract: The flow regime around a hexagonal polygon with low Reynolds numbers Re 200 is numerically investigated in two different orientations namely face- and corner oriented. The basic flow characteristics, including drag coefficient, lift coefficient, Strouhal number and critical Reynolds number of the hexagonal cylinders, are calculated by solving the Navier–Stokes and mass conservation (continuity) equations, using the Simple (semi-implicit method for pressure-linked equations) algorithm. Within the studied range of Re, the predicted lift coefficient and Strouhal number of the face-oriented hexagon were higher than those of the corner-oriented hexagon. In contrast, the predicted drag coefficient and critical Reynolds number of the corner-oriented hexagon were greater than those of the face-oriented one. Flow characteristics of a novel textured geometry are also studied using three-dimensional transient analysis. The Strouhal number St of the textured geometry was found to be in between the St of both the hexagonal cylinders, and its lift coefficient is lower than that of the hexagonal cylinders. The computational fluid dynamics results show that, within the studied Reynolds number range, the drag coefficient of the textured pipe is almost equal to that of the circular cylinder while its lift coefficient is substantially smaller than that of circular and face- and corner-oriented hexagon pipes.
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 05-2022
Publisher: Elsevier BV
Date: 10-2020
Publisher: Springer Singapore
Date: 23-12-2021
Publisher: Elsevier BV
Date: 09-2014
DOI: 10.1016/J.MARPOLBUL.2014.07.038
Abstract: Measurements of coral structural strength are coupled with a fluid dynamics-structural analysis to investigate the resilience of coral to wave loading under sea level rise and a typical Great Barrier Reef lagoon wave climate. The measured structural properties were used to determine the wave conditions and flow velocities that lead to structural failure. Hydrodynamic modelling was subsequently used to investigate the type of the bathymetry where coral is most vulnerable to breakage under cyclonic wave conditions, and how sea level rise (SLR) changes this vulnerability. Massive corals are determined not to be vulnerable to wave induced structural damage, whereas branching corals are susceptible at wave induced orbital velocities exceeding 0.5m/s. Model results from a large suite of idealised bathymetry suggest that SLR of 1m or a loss of skeleton strength of order 25% significantly increases the area of reef flat where branching corals are exposed to damaging wave induced flows.
Publisher: The Hong Kong Institute of Steel Construction
Date: 2016
Publisher: Elsevier BV
Date: 10-2020
Publisher: MDPI AG
Date: 31-03-2023
DOI: 10.3390/JMSE11040762
Abstract: While moving fish farms to offshore sites can be a more sustainable way to expand farmed fish production, the fish pens have to contend with a harsher environment. Thus, it is necessary to draw on offshore engineering competences for designing and analysing the offshore fish farming infrastructure. This paper reviews existing design and analysis guidance from maritime classification and national/international authorities that can be applicable for offshore fish farms. Based on the existing design guidelines, a review of design criteria for offshore fish farms under the following subtopics is provided: design life, design environmental loads, combining environmental loads, and miscellaneous load conditions. This review on the global performance analysis procedures and methods is presented based on practices used for neighbouring industries, such as offshore oil and gas and wind energy production, under the following subtopics: hydrostatic analysis, hydrodynamic analysis, and mooring system analysis with introducing theoretical background and modelling techniques. This paper also highlights limitations and cautions when using these design and analysis methods. Providing this comprehensive information, as well as commentary on their applications, will help engineers and designers to develop offshore fish farming infrastructure with confidence.
Publisher: MDPI AG
Date: 14-09-2023
DOI: 10.3390/JMSE11091795
Publisher: Elsevier BV
Date: 2023
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 05-2023
Publisher: World Conference on Timber Engineering (WCTE 2023)
Date: 2023
DOI: 10.52202/069179-0368
Publisher: CRC Press
Date: 08-08-2017
Publisher: Informa UK Limited
Date: 12-05-2015
Publisher: Academic World Research
Date: 11-2021
Publisher: MDPI AG
Date: 14-01-2022
DOI: 10.3390/JMSE10010110
Abstract: Subsea high pressure/high temperature (HP/HT) pipelines may be significantly affected by the effects of soil structure interaction (SSI) when subjected to earthquakes. Numerical simulations are herein applied to assess the role of soil deformability on the seismic vulnerability of an unburied pipeline. Overcoming most of the contributions existing in the literature, this paper proposes a comprehensive 3D model of the system (soil + pipeline) by performing OpenSees that allows the representation of non-linear mechanisms of the soil and may realistically assess the induced damage caused by the mutual interaction of buckling and seismic loads. Analytical fragility curves are herein derived to evaluate the role of soil structure interaction in the assessment of the vulnerability of a benchmark HP/HT unburied subsea pipeline. The probability of exceeding selected limit states was based on the definition of credited failure criteria.
Start Date: 10-2023
End Date: 10-2028
Amount: $2,959,803.00
Funder: Australian Research Council
View Funded Activity