ORCID Profile
0000-0003-0333-2265
Current Organisation
Victoria University
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Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2002
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2004
Publisher: Elsevier BV
Date: 03-2007
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 02-2019
Publisher: Wiley
Date: 18-01-2022
Abstract: This article presents experimental and numerical studies on the axial compressive behavior of square concrete‐encased concrete‐filled steel tubular (CECFST) short columns composed of a circular inner steel tube. Tests on six full‐scale short CECFST columns with the inner circular tube diameter varying from 320 to 500 mm were carried out to study the influences of sectional diameter and the tube thickness of circular CFST columns on their axial performance. A theoretical model is developed using fiber analysis method and validated against a large test database. The accuracy of various codified design models is evaluated and a simple model is proposed to calculate their ultimate strengths. Test results show that CECFST columns have improved load carrying capacity and can sustain large axial loads without significant strength degradation. In addition, increasing the thickness of the steel tube significantly improves the composite action of the steel and concrete of the inner CFST column, which increases the compressive strength of CECFST columns by 27.3%. However, the rate of increase in the compressive strength of the core concrete of the CFST column has been found to be higher for the column with a smaller local slenderness ratio. The ductility of CECFST columns is influenced by the concrete strength and the spacing of the stirrups. Furthermore, the design model suggested in this study can provide a better estimation than the codified design models.
Publisher: World Scientific Pub Co Pte Ltd
Date: 04-2013
DOI: 10.1142/S0219455412500654
Abstract: This paper presents a new numerical model for the nonlinear analysis of circular concrete-filled steel tubular (CFST) slender beam-columns with preload effects, in which the initial geometric imperfections, deflections caused by preloads, concrete confinement and second order effects are incorporated. Computational algorithms are developed to solve the nonlinear equilibrium equations. Comparative studies are undertaken to validate the accuracy of computational algorithms developed. Also included is a parametric study for examining the effects of the preloads, column slenderness, diameter-to-thickness ratio, loading eccentricity, steel yield stress and concrete confinement on the behavior of circular CFST slender beam-columns under eccentric loadings. The numerical model is demonstrated to be capable of predicting accurately the behavior of circular CFST slender beam-columns with preloads. The preloads on the steel tubes can affect significantly the behavior of CFST slender beam-columns and must be taken into account in the design.
Publisher: Elsevier BV
Date: 08-2012
Publisher: Avestia Publishing
Date: 06-2022
Publisher: American Concrete Institute
Date: 2000
DOI: 10.14359/863
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 04-2020
Publisher: Elsevier BV
Date: 07-2013
Publisher: Elsevier BV
Date: 09-2023
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2000
Publisher: Elsevier BV
Date: 02-2010
Publisher: SAGE Publications
Date: 12-2007
Publisher: Springer Science and Business Media LLC
Date: 07-2001
DOI: 10.1007/PL00013281
Publisher: Elsevier BV
Date: 06-2006
Publisher: Thomas Telford Ltd.
Date: 05-2003
DOI: 10.1680/STBU.2003.156.2.111
Abstract: Double skin composite (DSC) panels are constructed by filling concrete between two steel plates welded with stud shear connectors at a regular spacing. Steel plates in DSC panels used as two-way slabs or shearwalls may buckle locally between stud shear connectors when subjected to in-plane biaxial compression. This paper investigates the local and post-local buckling behaviour of biaxially compressed steel plates restrained by shear connectors and concrete in DSC panels by using the finite element modelling technique. Local buckling coefficients are obtained for steel plates with various aspect ratios, biaxial loading and boundary conditions by incorporating the shear stiffness effect of stud shear connectors. These buckling coefficients can be used to determine limiting width-to-thickness ratios for steel plates and the distribution of stud shear connectors. A geometric and material non-linear analysis is undertaken to quantify the post-local buckling strength of steel plates under biaxial compression. The initial imperfections of steel plates and non-linear shear–slip characteristics of stud shear connectors are taken into account in the post-local buckling analysis. Based on numerical results, biaxial strength interaction curves and formulae are developed for the ultimate strength design of steel plates in double skin composite construction.
Publisher: Elsevier BV
Date: 05-2000
Publisher: Elsevier BV
Date: 04-2020
Publisher: Elsevier BV
Date: 07-2000
Publisher: Elsevier BV
Date: 11-2018
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 08-2018
Publisher: SAGE Publications
Date: 12-1998
DOI: 10.1177/136943329800200108
Abstract: A theoretical investigation of the post-local buckling behaviour and ultimate strength of steel plates in concrete-filled fabricated box columns is presented. The finite element method is used to predict the post-local buckling response of plates restrained by concrete. Geometric imperfections and residual stresses are considered in the analysis. The model developed is initially compared with a classical solution for cl ed plates with initial imperfections. An extensive parametric study is then carried out to investigate the minimum local buckling coefficient and the effects of geometric imperfections and residual stresses on the post-local buckling strength of cl ed steel plates. An effective width model is proposed for the design of cl ed steel plates, and this can be used in the determination of the ultimate strength of short concrete-filled box columns. Independent test results of concrete-filled steel box columns are compared with the theoretical predictions by using the proposed design model. It is confirmed that the proposed design model predicts the behaviour of real concrete-filled steel box columns extremely well.
Publisher: Elsevier BV
Date: 10-2014
Publisher: Elsevier BV
Date: 10-2023
Publisher: Elsevier BV
Date: 04-2023
Publisher: Elsevier BV
Date: 2023
Publisher: Elsevier BV
Date: 2017
Publisher: Informa UK Limited
Date: 2007
Publisher: Wiley
Date: 25-03-2022
Abstract: Stainless steel has increasingly been utilized in concrete‐filled composite columns because of its high corrosion resistance and aesthetic appearance. However, there is little published information on the structural behavior of concrete‐filled double‐skin steel tubular (CFDST) columns made of square outer stainless‐steel skin and circular inner carbon steel tubes. The present study focuses on the nonlinear analysis of axially loaded CFDST short columns with outer square stainless steel tube and inner circular carbon steel tube. The explicit analysis methodology is adopted to develop the finite element model of CFDST columns. The verified model is employed to undertake a parametric study on the geometric and material effects on the performance of CFDST columns. The findings indicate that the outer tube diameter‐to‐thickness should be maintained to ensure the required plastic resistance of CFDST columns with hollow ratio in range from 0.34 to 0.42. The design equation for calculating the ultimate axial strength of CFDST columns with outer stainless steel is proposed.
Publisher: Elsevier BV
Date: 11-2023
Publisher: Elsevier BV
Date: 08-2018
Publisher: Frontiers Media SA
Date: 18-06-2021
DOI: 10.3389/FMICB.2021.663835
Abstract: Tigecycline is a tetracycline derivative that is being used as an antibiotic of last resort. Both tigecycline and tetracycline bind to the small (30S) ribosomal subunit and inhibit translation. Target mutations leading to resistance to these antibiotics have been identified both in the 16S ribosomal RNA and in ribosomal proteins S3 and S10 (encoded by the rpsJ gene). Several different mutations in the S10 flexible loop tip residue valine 57 (V57) have been observed in tigecycline-resistant Escherichia coli isolates. However, the role of these mutations in E. coli has not yet been characterized in a defined genetic background. In this study, we chromosomally integrated 10 different rpsJ mutations into E. coli , resulting in different exchanges or a deletion of S10 V57, and investigated the effects of the mutations on growth and tigecycline/tetracycline resistance. While one exchange, V57K, decreased the minimal inhibitory concentration (MIC) (Etest) to tetracycline to 0.75 μg/ml (compared to 2 μg/ml in the parent strain) and hence resulted in hypersensitivity to tetracycline, most exchanges, including the ones reported previously in resistant isolates (V57L, V57D, and V57I) resulted in slightly increased MICs to tigecycline and tetracycline. The strongest increase was observed for the V57L mutant, with a MIC (Etest) to tigecycline of 0.5 μg/ml (compared to 0.125 μg/ml in the parent strain) and a MIC to tetracycline of 4.0 μg/ml. Nevertheless, none of these exchanges increased the MIC to the extent observed in previously described clinical tigecycline-resistant isolates. We conclude that, next to S10 mutations, additional mutations are necessary in order to reach high-level tigecycline resistance in E. coli . In addition, our data reveal that mutants carrying S10 V57 exchanges or deletion display growth defects and, in most cases, also thermosensitivity. The defects are particularly strong in the V57 deletion mutant, which is additionally cold-sensitive. We hypothesize that the S10 loop tip residue is critical for the correct functioning of S10. Both the S10 flexible loop and tigecycline are in contact with helix h31 of the 16S rRNA. We speculate that exchanges or deletion of V57 alter the positioning of h31, thereby influencing both tigecycline binding and S10 function.
Publisher: Elsevier BV
Date: 12-2023
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2007
Publisher: Elsevier BV
Date: 05-2019
Publisher: Elsevier BV
Date: 02-2020
Publisher: Elsevier BV
Date: 03-2008
Publisher: Elsevier BV
Date: 12-2023
Publisher: World Scientific Pub Co Pte Lt
Date: 08-2019
DOI: 10.1142/S0219455419500858
Abstract: A mathematical model using the fiber approach is presented in this paper for quantifying the strength and fire-resistance of eccentrically loaded slender concrete-filled steel tubular (CFST) columns with rectangular sections incorporating the interaction of local and global buckling. The model utilizes the thermal simulator to ascertain the temperature distribution in cross-sections, and the nonlinear global buckling analysis to predict the interaction responses of local and global buckling of loaded CFST slender columns to fire effects. The initial geometric imperfection, air gap between the concrete and steel tube, tensile concrete strength, deformations caused by preloads, and temperature-dependent material behavior are included in the formulation. The computational theory, modeling procedure and numerical solution algorithms are described. The computational model is verified by existing experimental and numerical results. The structural responses and fire-resistance of CFST columns of rectangular sections exposed to fire are investigated. The mathematical model proposed is demonstrated to be an efficient computer simulator for the fire-performance of slender CFST columns loaded eccentrically.
Publisher: Elsevier BV
Date: 06-2014
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 08-2000
Publisher: CRC Press
Date: 08-10-2018
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 05-2019
Publisher: CRC Press
Date: 30-09-2004
Publisher: Elsevier BV
Date: 11-2022
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 06-2023
Publisher: Elsevier BV
Date: 02-2021
Publisher: Association for Research in Vision and Ophthalmology (ARVO)
Date: 06-07-2011
DOI: 10.1167/11.8.2
Abstract: We have compared the time course of dark adaptation of the human scotopic visual system, measured psychophysically and from the b-wave of the electroretinogram (ERG), for bleaches ranging from a few percent to near total. We also measured light adaptation, in order to apply a "Crawford transformation" to convert the raw measurements of dark adaptation into equivalent background intensities. For both the "psychophysical threshold equivalent" intensity and the "ERG b-wave sensitivity equivalent" intensity, the equivalent background declined over much of its range with an "S2" component, though with somewhat different slopes of -0.36 (psychophysical) and -0.22 (ERG) log(10) unit min(-1), respectively. In addition, the magnitude of the equivalent background was approximately 1 log(10) unit lower in the psychophysical experiments than in the ERG experiments. Despite these differences, the two approaches extract a common time course for the decline in level of free opsin following moderately large bleaches. We conclude that the recovery of psychophysical scotopic visual threshold over the S2 region reflects events that are present by the stage of the first synapse of rod vision, stemming ultimately from the presence of unregenerated opsin in the rod outer segments.
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 10-2019
Publisher: IOP Publishing
Date: 06-2010
Publisher: Elsevier BV
Date: 2023
Publisher: Elsevier BV
Date: 12-2023
Publisher: Elsevier BV
Date: 09-2023
Publisher: SAGE Publications
Date: 10-01-2022
DOI: 10.1177/13694332211065187
Abstract: Circular concrete-filled double-skin steel tubular (CFDST) columns with external stainless-steel are high-performance composite columns that have potential applications in civil construction including the construction of offshore structures, bridge piers, and transmission towers. Reflecting the limited research performed on investigating their mechanical performance, this study develops a computationally efficient fiber model to simulate the responses of short and slender beam-columns accounting for the influences of material and geometric nonlinearities. Accurate material laws of stainless steel, carbon steel, and confined concrete are implemented in the mathematical modeling scheme developed. A new solution algorithm based on the Regula-Falsi method is developed to maintain the equilibrium condition. The independent test results of short and slender CFDST beam-column are utilized to validate the accuracy of the theoretical solutions. The influences of various column parameters are studied on the load-axial strain [Formula: see text] curves, load-lateral deflection [Formula: see text] curves, column strength curves, and interaction curves of CFDST columns. Design formulas are suggested for designing short and beam-columns and validated against the numerical results. The computational model is found to be capable of simulating the responses of CFDST short and slender columns reasonably well. Parametric studies show that the consideration of the concrete confinement is important for the accuracy of the prediction of their mechanical responses. Furthermore, high-strength concrete can be utilized to enhance their load-carrying capacity particularly for short and intermediate slender beam-columns. The strengths of CFDST columns computed by the suggested design model are in good agreement with the test and numerical results.
Publisher: Elsevier BV
Date: 10-2019
Publisher: Elsevier BV
Date: 12-2013
Publisher: Elsevier BV
Date: 12-2009
Publisher: Elsevier BV
Date: 03-2009
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2005
Publisher: Elsevier BV
Date: 03-2008
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 2002
Publisher: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 2023
Publisher: Elsevier BV
Date: 2022
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 10-2021
Publisher: SAGE Publications
Date: 08-1999
Abstract: This paper presents a method for assisting the optimal selection of topologies for the minimum-weight design of continuum structures subject to stress constraints by using the performance index (PI). A performance index is developed for evaluating the efficiency of structural topologies based on the scaling design approach. This performance index is incorporated in the evolutionary structural optimization (ESO) method to monitor the optimization process when gradually removing inefficient material from the structure. The optimal topology can be identified from the performance index history. Various structures with stress and height constraints are investigated by using this performance index, which is also employed to compare the efficiency of structural topologies generated by different optimization methods. It is shown that the proposed performance index is capable of measuring the efficiency of structural topologies obtained by various structural optimization methods and is a valuable design tool for engineers in selecting optimal topologies in structural design.
Publisher: Elsevier BV
Date: 10-2019
Publisher: Elsevier BV
Date: 10-2019
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 06-2020
Publisher: SAGE Publications
Date: 12-2007
DOI: 10.1260/136943307783571418
Abstract: The performance-based optimization (PBO) method has recently been developed for topology design of continuum structures with stress, displacement and mean compliance constraints. The PBO method incorporates the finite element analysis, modern structural optimization theory and performance-based design concepts into a single scheme to automatically generate optimal designs of continuum structures. Performance indices are used to monitor the performance optimization history of topologies while performance-based optimality criteria are employed to identify the optimum from the optimization process. The performance characteristics of a structure in an optimization process are fully captured. The PBO technique allows the designer to tailor the design to a specific performance level required by the owner. This paper reviews the state-of-the-art development of automated performance-based optimal design techniques for topology design of continuum structures. Several practical design ex les are provided to demonstrate the effectiveness and validity of the PBO technology as an advanced design tool.
Publisher: Elsevier BV
Date: 03-2012
Publisher: IEEE
Date: 10-2008
Publisher: Elsevier BV
Date: 11-2023
Publisher: Elsevier BV
Date: 04-2023
Publisher: CRC Press
Date: 07-12-2018
Publisher: Elsevier BV
Date: 02-2011
Publisher: Elsevier BV
Date: 07-2015
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 02-2011
Publisher: Elsevier BV
Date: 03-2012
Publisher: World Scientific Pub Co Pte Ltd
Date: 28-09-2023
Publisher: Elsevier BV
Date: 08-2004
Publisher: Elsevier BV
Date: 12-2022
Publisher: Elsevier BV
Date: 02-2009
Publisher: Elsevier BV
Date: 02-2009
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 11-2013
Publisher: Elsevier BV
Date: 02-2023
Publisher: Wiley
Date: 13-10-2023
Publisher: Elsevier BV
Date: 04-2021
Publisher: SAGE Publications
Date: 10-07-2021
DOI: 10.1177/13694332211029735
Abstract: Hexagonal concrete-filled steel tubular (HCFST) columns have been used to carry large loads in tall composite buildings. Their behavior and strength are different from those of circular and square concrete-filled steel tubular (CFST) columns due to the confinement effect. This article describes a computational modeling method of nonlinear fiber analysis recognizing the concrete confinement for the response simulation of HCFST short columns subjected to axial compression. New constitutive relations of confinement for quantifying the confining stresses on the concrete confined by the hexagonal steel tube and the residual concrete strength are developed by means of analyzing existing test data. The computational modeling program written is verified by existing experimental data and then employed to ascertain the behavior of HCFST columns with important parameters. The current design standards for CFST circular columns are used to determine the strengths of HCFST columns to evaluate their applicability to the design of HCFST columns. Proposed is a new simple design equation for computing the axial capacities of HCFST columns. The computational model and the design equation proposed are shown to be accurate, and effective simulation and design tools for HCSFT stub columns that are loaded concentrically in comparisons with the current design codes.
No related grants have been discovered for Qing Quan Liang.