ORCID Profile
0000-0002-2839-1707
Current Organisation
University of Adelaide
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Civil Engineering | Structural Engineering | Construction Materials
Civil Construction Design | Expanding Knowledge in Engineering | Residential Construction Design | Stone, Ceramics and Clay Materials |
Publisher: SAGE Publications
Date: 2015
DOI: 10.1260/1369-4332.18.1.107
Abstract: This paper presents a reliable closed form analytical solution without any major simplification which can be used with confidence by designers for the analysis of statically indeterminate horizontally curved bridges idealized as curved girders. The unit load method, a method extracted from the Castigliano's second theorem is used to derive the proposed closed form analytical solution which is then used to obtain the influence line diagram of shear force, bending moment and torsion of the curved bridge girder and it is validated with the published test results and also with the finite element solution of a curved girder. Moreover, an extensive parametric study is conducted using the proposed analytical model to investigate the effect of various parameters such as curvature ratio, span length, number of cells and number of loading lanes on bending moment and torsion of the curved bridges subjected to Australian bridge design loads where the effect of all these parameters except the number of cells is found to be significant. Finally, a comparative study of the behaviour of horizontally curved bridges subjected to loads recommended by three different international bridge design codes is undertaken which concludes that the Eurocode LM1 predicts higher bending moment as well as torsion with respect to other codes.
Publisher: Acoustical Society of America (ASA)
Date: 06-1993
DOI: 10.1121/1.405710
Abstract: Large- litude free flexural vibration of stiffened and unstiffened plates has been studied by using the finite element method. An isoparametric quadratic plate-bending element has been used both for the plate and the stiffener. The dynamic version of von Karman’s field equations has been adopted and the formulation has been done in the total Lagrangian coordinate system. The in-plane deformation and inertia have been taken into account. The resulting nonlinear equations have been solved by the direct iteration technique using a linear mode shape as the starting vector. The stiffener has been elegantly modeled so that it can be placed anywhere within the plate element and it need not follow the nodal lines. This has increased the flexibility of the mesh generation considerably. The arbitrary orientation and eccentricity of the stiffener have been incorporated in the formulation. The shear deformation has been incorporated according to Mindlin’s hypothesis. Stiffened and unstiffened plates that have various boundary conditions have been analyzed and the results have been compared with those available in the literature.
Publisher: Elsevier BV
Date: 06-2003
Publisher: Elsevier BV
Date: 06-2017
Publisher: Wiley
Date: 08-06-2004
DOI: 10.1002/NME.1005
Publisher: Elsevier BV
Date: 05-2009
Publisher: Elsevier BV
Date: 05-2013
Publisher: Elsevier BV
Date: 11-2023
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-2003
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2005
Publisher: Elsevier BV
Date: 08-2023
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-2009
Publisher: Elsevier BV
Date: 05-2002
Publisher: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 03-2005
Publisher: Elsevier BV
Date: 10-2013
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2019
Publisher: Elsevier BV
Date: 06-2008
Publisher: Elsevier BV
Date: 04-2001
Publisher: Elsevier BV
Date: 03-1993
Publisher: Elsevier BV
Date: 04-2017
Publisher: Elsevier BV
Date: 08-2017
Publisher: Elsevier BV
Date: 05-2009
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Date: 02-2009
DOI: 10.2514/1.39180
Publisher: Elsevier BV
Date: 2006
Publisher: American Society of Civil Engineers (ASCE)
Date: 2010
Publisher: World Scientific Pub Co Pte Lt
Date: 06-2010
DOI: 10.1142/S0219455410003324
Abstract: The dynamic instability of composite and sandwich laminates with interfacial slips is studied in this paper. An efficient finite element model recently developed by the authors is used for the purpose. The plate model is based on a refined higher-order shear deformation theory, where the transverse shear stresses are continuous at the layer interfaces with stress free conditions at plate top and bottom. A linear spring-layer model is used to model the interfacial slips by introducing in-plane displacement jump at the interfaces. Some interesting new results are presented in this paper, which are useful to understanding of the behavior of laminated composite materials.
Publisher: Elsevier BV
Date: 02-1995
Publisher: Elsevier BV
Date: 11-2008
Publisher: Elsevier BV
Date: 05-2007
Publisher: Springer Science and Business Media LLC
Date: 10-03-2004
Publisher: Informa UK Limited
Date: 19-10-2010
Publisher: Trans Tech Publications, Ltd.
Date: 05-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.553.673
Abstract: This paper presents an efficient finite element modeling technique for stiffened composite shells having different stiffening arrangements. The laminated shell skin is modeled with a triangular degenerated curved shell element having 3 corner nodes and 3 mid-side nodes. An efficient curved beam element compatible with the shell element is developed for the modeling of stiffeners which may have different lamination schemes. The formulation of the 3 nod degenerated beam element may be considered as one of the major contributions. The deformation of the beam element is completely defined in terms of the degrees of freedom of shell elements and it does not require any additional degrees of freedom. As the usual formulation of degenerated beam elements overestimates their torsional rigidity, a torsion correction factor is introduced for different lamination schemes. Numerical ex les are solved by the proposed finite element technique to assess its performance.
Publisher: ASME International
Date: 02-2013
DOI: 10.1115/1.4007262
Abstract: Free vibration behavior of laminated soft core sandwich plates with stiff laminated face sheets is investigated using a new C0 finite element (FE) model based on higher order zigzag theory (HOZT) in this paper. The in-plane displacement variations are considered to be cubic for both the face sheets and the core, while the transverse displacement is assumed to vary quadratically within the core and remains constant in the faces beyond the core. The plate theory ensures a shear stress-free condition at the top and bottom surfaces of the plate. Thus, the plate theory has all of the features required for an accurate modeling of laminated sandwich plates. As very few elements based on this plate theory (HOZT) exist and they possess certain disadvantages, an attempt has been made to develop this new element. The nodal field variables are chosen in such a manner to overcome the problem of continuity requirement of the derivatives of transverse displacements, i.e., no need to impose any penalty stiffness in the formulation. A nine node C0 quadratic plate finite element is implemented to model the HOZT for the present analysis. A new C0 element has been utilized to study some interesting problems on free vibration analysis of laminated sandwich plates. Many new results are also presented which should be useful for future research.
Publisher: Elsevier BV
Date: 02-2002
Publisher: Informa UK Limited
Date: 11-05-2023
Publisher: Elsevier BV
Date: 12-2006
Publisher: Elsevier BV
Date: 04-2015
Publisher: Elsevier BV
Date: 10-2004
Publisher: Elsevier BV
Date: 2003
Publisher: Elsevier BV
Date: 11-2005
Publisher: Elsevier BV
Date: 08-2004
Publisher: ASME International
Date: 14-01-2005
DOI: 10.1115/1.2358152
Abstract: The vibration characteristics of laminated sandwich plates subjected to in-plane forces is studied taking imperfections at the layer interfaces. The plate problem, which is unattended so far, is modeled by a refined plate theory where the transverse shear stress has parabolic through thickness variation with continuity at the layer interfaces and it becomes zero at the plate top and bottom surfaces. The interfacial imperfection is represented by a linear spring layer model. Based on these a new triangular element is developed where proper attention has been paid on the inter-elemental continuity requirement posed by the plate theory.
Publisher: Elsevier BV
Date: 07-2012
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2018
Publisher: Elsevier BV
Date: 04-2018
Publisher: Wiley
Date: 17-02-2023
DOI: 10.1002/NME.7218
Abstract: In this study, a new traction‐separation based constitutive model for use in finite element simulation of masonry joints under complex loading conditions is developed for cohesive elements. The proposed model is formulated using damage parameters and plastic deformation with mutual couplings, and can accurately simulate the complex nonlinear behaviors of masonry joints considering hardening or softening of strength and stiffness degradation. To enhance the numerical stability of the model, plasticity and damage are separated algorithmically and implemented in two phases. In the first phase, the plastic deformations are treated using a multi‐surface plasticity model composed of a smooth hyperbolic yield surface for tension‐shear mixed‐mode failure and an elliptical cap primarily for the compressive failure. This is implemented in effective stress space and helps restrict the evolution of yield surfaces with no softening, significantly enhancing the efficiency of stress return mapping by the closed point projection method. In addition, an adaptive sub‐stepping scheme is adopted to further improve the robustness of the numerical implementation. In the second phase, nominal stresses are computed from the effective stresses using damage parameters. The evolution of these damage parameters is defined in terms of plastic work which is defined by a polynomial form, and is recommended in this study for a better calibration capability. Improvements are made in the formulation of compressive cap including incorporation of hardening of strength and stiffness degradations as these are ignored in existing interface models. This approach helped improve simulation of masonry under cyclic loads with tension‐compression transitions. For the structural level applications, the interface model is implemented within a finite element program, which is utilized to simulate failure of a number of masonry specimens under in‐plane/out‐of‐plane monotonic/cyclic loading. The simulated results are rigorously validated with existing experimental data that shows a good potential in modeling masonry structures.
Publisher: SAGE Publications
Date: 05-06-2009
Abstract: A finite element model based on an improved higher order zigzag plate theory developed by the authors is refined in this study and applied to bending and vibration response of soft core sandwich plates. The theory satisfies interlayer transverse shear stress continuity including transverse shear stress free condition at the plate top and bottom surfaces and transverse normal compressibility of the core. The in-plane displacements vary cubically through the entire thickness, while transverse displacement is assumed to vary quadratically within the core. In order to have a better computational benefit, a C 0 finite element formulation is adopted. This is refined through satisfaction of certain constrains variationally using a penalty function approach. The performance of the model is demonstrated by comparing the present results with 3D elasticity solutions and other available results.
Publisher: SAGE Publications
Date: 24-06-2009
Abstract: Vibration and buckling of sandwich laminates are studied for different degrees of imperfections at the layer interfaces using a refined plate theory. In this plate theory, the through-thickness variation of transverse shear stresses is represented by piecewise parabolic functions, where the continuity of these stresses is satisfied at the layer interfaces. The transverse shear stresses free condition at the top and bottom surfaces of the plate is also satisfied. The interlaminar imperfections are represented by in-plane displacement jumps at the layer interfaces by a linear spring layer model. Many new results are generated that should be useful for future research as there is no such published result on imperfect sandwich plates.
Publisher: New Zealand Society for Earthquake Engineering
Date: 30-09-2016
DOI: 10.5459/BNZSEE.49.3.234-244
Abstract: A case study was conducted to investigate the applicability of the equivalent frame modelling for the nonlinear time-history analysis of unreinforced masonry buildings with flexible diaphragms. The dynamic responses calculated from the equivalent frame models were compared against shake table test results of a full-scale two-storey stone masonry building. The investigated modelling approach reflected the simplifications commonly assumed for the global analysis of buildings namely, considering the diaphragms to behave elastically and neglecting the stiffness and strength contributions of the out-of-plane responding walls. The sensitivity of the analysis to different idealisations of the equivalent frame, as well as to the diaphragm stiffness values, were also investigated. Discussions are provided on the accuracies and limitations of the investigated modelling approach, which may serve as a useful guidance for practical application.
Publisher: Elsevier BV
Date: 12-1992
Publisher: Elsevier BV
Date: 02-2014
Publisher: Elsevier BV
Date: 05-2020
Publisher: SAGE Publications
Date: 08-2006
Abstract: The buckling of composite laminates subjected to in-plane partial edge compression is studied using a refined plate theory. In this theory, transverse shear stresses are continuous at the layer interfaces along with stress-free conditions at the top and bottom surfaces of the plate. It is quite interesting to note that the plate model having all these refined features requires unknowns only at the reference plane. However, this theory demands C 1 continuity of transverse displacement at the element edges, which is difficult to accommodate in any existing finite element. The present study is made by a new triangular element developed for the purpose.
Publisher: Elsevier BV
Date: 11-2006
Publisher: Elsevier BV
Date: 11-2018
Publisher: SAGE Publications
Date: 08-2008
Abstract: This paper presents an improved higher order zigzag theory for vibration of laminated sandwich plates. It ensures continuity of transverse shear stresses at all the layer interfaces and transverse shear stress-free condition at the top and bottom surfaces apart from core compressibility. The through-thickness variation of in-plane displacements is assumed to be cubic, whereas transverse displacement varies quadratically across the core, which is modelled as a three-dimensional elastic continuum. An efficient C 0 finite element is developed for the implementation of the plate theory. The model is validated using three-dimensional elasticity solutions and some other relevant results available in the literature.
Publisher: Elsevier BV
Date: 11-2016
Publisher: Elsevier BV
Date: 05-2014
Publisher: Elsevier BV
Date: 05-2016
Publisher: Elsevier BV
Date: 05-2020
Publisher: Informa UK Limited
Date: 04-2005
Publisher: Elsevier BV
Date: 04-2011
Publisher: Informa UK Limited
Date: 12-09-2022
Publisher: Elsevier BV
Date: 2016
Publisher: Elsevier BV
Date: 2017
Publisher: Informa UK Limited
Date: 03-09-2016
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2004
Publisher: American Society of Civil Engineers (ASCE)
Date: 2013
Publisher: Elsevier BV
Date: 2011
Publisher: SAGE Publications
Date: 02-2003
DOI: 10.1177/0731684403022003018
Abstract: A high precision triangular plate bending element proposed by the second author of this paper has been upgraded for the free vibration analysis of laminated composite right angle triangular plates. The effect of shear deformation has been incorporated. An efficient mass lumping scheme with rotary inertia has been recommended. Numerical ex les of composite triangular plates having different thickness ratios, side ratios, fibre-orientations, number of layers and boundary conditions have been solved by this element. For validation of the present formulation and element few results on isotropic and orthotropic plates have been compared with those obtained from literatures. The results on composite plates have been presented as new results.
Publisher: Elsevier BV
Date: 2018
Publisher: SAGE Publications
Date: 03-2016
Abstract: A novel analysis technique is introduced for efficient modelling of box girder bridge decks. The general three-dimensional equations used to accurately define the deformation of these complex beam-like slender structures are decoupled into a two-dimensional cross-sectional problem and a one-dimensional beam problem through decomposition of the three-dimensional strain field. The two-dimensional cross-sectional problem is solved by a two-dimensional finite element analysis considering in-plane as well as out-of-plane warping displacements of the beam section. This gives an accurate constitutive relationship of the one-dimensional beam problem without making any major assumptions as is often done in usual beam theories. The one-dimensional beam problem is solved by a one-dimensional beam finite analysis and the results obtained are used to recover three-dimensional stress, strain and displacement fields accurately. Numerical ex les of box girder bridge deck systems having thin-walled sections are solved by the proposed approach to show its performance.
Publisher: Elsevier BV
Date: 12-2005
Publisher: Informa UK Limited
Date: 10-2003
Publisher: Elsevier BV
Date: 08-2008
Publisher: Elsevier BV
Date: 08-2019
Publisher: SAGE Publications
Date: 05-10-2011
Abstract: Free vibration response of laminated sandwich beams having a soft core is studied by using a recently developed C 0 finite element beam model. The model has been developed based on higher order zigzag theory where the in-plane displacement variation is considered to be cubic for both the face sheets and the core. The transverse displacement is assumed to be quadratic within the core while it remains constant in the faces beyond the core. The model satisfies the condition of transverse shear stress continuity at the layer interfaces and the zero transverse shear stress condition at the top and bottom of the beam. The nodal field variables are chosen in an efficient manner to overcome the problem of continuity requirement of the derivatives of transverse displacements. Numerical ex les on free vibration covering different features of laminated composite and sandwich beams are presented. Many new results are also presented which should be useful for future research.
Publisher: Elsevier BV
Date: 03-2012
Publisher: Elsevier BV
Date: 03-2006
Publisher: Elsevier BV
Date: 12-2015
Publisher: Japan Society of Mechanical Engineers
Date: 1993
Publisher: Elsevier BV
Date: 03-2017
Publisher: Elsevier BV
Date: 06-1993
Publisher: ASME International
Date: 22-04-2009
DOI: 10.1115/1.3086595
Abstract: A finite element dynamic instability analysis of stiffened shell panels with cutout subjected to uniform in-plane harmonic edge loading along the two opposite edges is presented in this paper. The eight-noded isoparametric degenerated shell element and a compatible three-noded curved beam element are used to model the shell panels and the stiffeners, respectively. As the usual formulation of degenerated beam element is found to overestimate the torsional rigidity, an attempt has been made to reformulate it in an efficient manner. Moreover the new formulation for the beam element requires five degrees of freedom per node as that of shell element. Bolotin method is applied to analyze the dynamic instability regions. Numerical results of convergence studies are presented and comparison is made with the published results from literature. The effects of various parameters such as shell geometry, radius of curvature, cutout size, stiffening scheme, and dynamic load factors are considered in dynamic instability analysis of stiffened shell panels with cutout. The free vibration and static stability (buckling) results are also presented. With the consideration of radius of curvatures the panels reduce from deep shell case to shallow shell case and finally become flat plate.
Publisher: Elsevier BV
Date: 04-2011
Publisher: SAGE Publications
Date: 25-01-2017
Abstract: Static and vibration characteristics of thin-walled straight and curved box beams were investigated experimentally. Three different beam configurations were considered for the tests: one straight and two curved box beams. The load was applied at the centroid of the box section for the straight and one curved beam specimens. However, for the other curved specimen, the load was applied eccentrically to investigate its behavior under the additional torsion induced by the eccentricity. Displacements and strains were obtained using linear variable displacement transducer, one-directional and rosette strain gages. The specimens were excited using an impact at their free ends. The time history of strains was obtained to calculate natural frequencies and d ing ratios. The experiment results were compared with those obtained from three-dimensional finite element analysis for all cases. The results obtained from implementing tests on the straight specimen were also used to validate an efficient numerical method recently developed by the authors.
Publisher: Elsevier BV
Date: 05-2003
Publisher: Informa UK Limited
Date: 03-07-2017
Publisher: World Scientific Pub Co Pte Lt
Date: 12-2010
DOI: 10.1142/S1758825110000743
Abstract: The effect of non-uniform in-plane pulsating edge loading on dynamic instability behavior of perforated stiffened shell panels is presented in this paper using finite element method. The eight-noded isoparametric degenerated shell element and a compatible three-noded curved beam element are used to model the shell panels and the stiffeners, respectively. Bolotin method is applied to analyze the dynamic instability regions. Numerical results of convergence studies are presented and comparison is made with the published results from the literature. The effects of various parameters like shell geometry, loading type, cutout size and dynamic load factors are considered in dynamic instability analysis of stiffened shell panels with cutout. The buckling results of the cutout stiffened panels are also presented.
Publisher: SAGE Publications
Date: 07-2003
DOI: 10.1177/1099636203005003001
Abstract: A four noded plate element based on a refined higher order shear deformation theory is developed for the analysis of composite and sandwich plates. This plate theory satisfies the conditions of inter-laminar shear stress continuity and stress free top and bottom surfaces of the plate. Moreover, the number of independent unknowns is the same as that in the first order shear deformation theory. The inter-elemental continuity, as desired by the plate theory, is fully satisfied in the present element. Numerical ex les of composite and sandwich plates are solved to validate the element. Some new results are also presented.
Publisher: Elsevier BV
Date: 12-2023
Publisher: Elsevier BV
Date: 05-2017
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 05-2016
Publisher: Elsevier BV
Date: 06-2012
Publisher: Elsevier BV
Date: 09-2012
Publisher: Elsevier BV
Date: 05-2017
Publisher: Elsevier BV
Date: 04-2002
Publisher: Wiley
Date: 17-08-2001
DOI: 10.1002/CNM.440
Publisher: Informa UK Limited
Date: 15-04-2015
Publisher: Elsevier BV
Date: 11-2007
Publisher: Elsevier BV
Date: 07-2017
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 12-2007
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2002
Publisher: Informa UK Limited
Date: 23-03-2018
Publisher: Elsevier BV
Date: 12-2018
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Date: 11-2006
DOI: 10.2514/1.6467
Publisher: Elsevier BV
Date: 1992
Start Date: 03-2019
End Date: 06-2023
Amount: $320,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 11-2022
End Date: 11-2025
Amount: $308,000.00
Funder: Australian Research Council
View Funded Activity