The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Ulf Arne Girhammar - One of the best experts on this subject based on the ideXlab platform.
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Effect of Ring Beam Stiffness on Behaviour of Reticulated Timber Domes
International Journal of Space Structures, 2005Co-Authors: Danhua Pan, Ulf Arne GirhammarAbstract:Domes are efficient structural systems for long clear-span buildings. The introduction of laminated timber highlighted the economic advantages of this material and led to the use of timber domes even for very large spans. In this paper, reticulated timber domes of triangular network shape with decking and bottom tension ring are considered. These types of domes have high Stiffness in all directions along the surface and are kinematically stable. The dome is subjected to uniformly distributed load over the entire structure. The dome model is generated with a preprocessor program called DOME-IN and analysed with ABAQUS.The focus of this paper is to evaluate the behaviour of reticulated timber domes with respect to different Stiffnesses of the bottom ring Beam, here defined as a non-dimensional ring Beam area parameter Ar*, which is shown to be a very well adapted design parameter for the ring Beam.As far as global buckling is concerned, the critical pressure is sensitive to the bottom ring Beam Stiffness on...
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Ring Beam Stiffness effect on behaviour of reticulated timber domes
2002Co-Authors: D. H. Pan, Ulf Arne GirhammarAbstract:In this paper, reticulated timber domes of triangular network shape with decking and bottom tension ring are considered. The dome is subjected to evenly distributed load over entire dome. The dome model is generated by a preprocessor program DOMEIN and analysed by ABAQUS. The behaviour with respect to different Stiffnesses of the bottom ring Beam is evaluated. A design parameter for the ring Beam is introduced (Ar*). It is shown that the non-dimensional area parameter should exceed Ar* > 20 in order to obtain optimum values for the buckling load, maximum deflection, normal forces and bending moments.
Chenyu Zhang - One of the best experts on this subject based on the ideXlab platform.
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Structure mechanical modeling of thin-walled closed- section composite Beams, part 2: multi-cell cross section
Composite Structures, 2014Co-Authors: Simon Wang, Chenyu ZhangAbstract:Abstract An improved structure mechanical modeling with excellent accuracy is developed for single-cell thin-walled closed-section composite Beams based on previous work. Both axial warping effect and the effect of material anisotropies on the shell wall mid-surface shear strain are considered. The shear strain is calculated directly from the general constitutive law of the shell wall. Closed form expressions are obtained of one-dimensional global Beam Stiffness matrix. Numerical comparisons with ABAQUS simulations are performed for box and cylindrical Beams with a variety of lamina layups under various loading conditions and excellent agreements are observed. The effect of material anisotropies on the shell wall mid-surface shear strain has significant influence on the accuracy of modeling. In contrast, the axial warping effect has a negligible influence in cases considered. Significant deficiency of some existing models is revealed.
Ashraf M. Badir - One of the best experts on this subject based on the ideXlab platform.
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Theory of anisotropic thin-walled closed-cross-section Beams
Composites Engineering, 1992Co-Authors: Victor L. Berdichevsky, Erian A. Armanios, Ashraf M. BadirAbstract:A variationally and asymptotically consistent theory is developed in order to derive the governing equations of anisotropic thin-walled Beams with closed sections. The theory is based on an asymptotic analysis of two-dimensional shell theory. Closed-form expressions for the Beam-Stiffness coefficients, stress and displacement fields are provided. The influence of material anisotropy on the displacement field is identified. A comparison with the displacement fields obtained by other analytical developments is performed. The Stiffness coefficients and static response are also compared with finite element predictions, closed-form solutions and test data.
Danhua Pan - One of the best experts on this subject based on the ideXlab platform.
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Effect of Ring Beam Stiffness on Behaviour of Reticulated Timber Domes
International Journal of Space Structures, 2005Co-Authors: Danhua Pan, Ulf Arne GirhammarAbstract:Domes are efficient structural systems for long clear-span buildings. The introduction of laminated timber highlighted the economic advantages of this material and led to the use of timber domes even for very large spans. In this paper, reticulated timber domes of triangular network shape with decking and bottom tension ring are considered. These types of domes have high Stiffness in all directions along the surface and are kinematically stable. The dome is subjected to uniformly distributed load over the entire structure. The dome model is generated with a preprocessor program called DOME-IN and analysed with ABAQUS.The focus of this paper is to evaluate the behaviour of reticulated timber domes with respect to different Stiffnesses of the bottom ring Beam, here defined as a non-dimensional ring Beam area parameter Ar*, which is shown to be a very well adapted design parameter for the ring Beam.As far as global buckling is concerned, the critical pressure is sensitive to the bottom ring Beam Stiffness on...
Simon Wang - One of the best experts on this subject based on the ideXlab platform.
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Structure mechanical modeling of thin-walled closed- section composite Beams, part 2: multi-cell cross section
Composite Structures, 2014Co-Authors: Simon Wang, Chenyu ZhangAbstract:Abstract An improved structure mechanical modeling with excellent accuracy is developed for single-cell thin-walled closed-section composite Beams based on previous work. Both axial warping effect and the effect of material anisotropies on the shell wall mid-surface shear strain are considered. The shear strain is calculated directly from the general constitutive law of the shell wall. Closed form expressions are obtained of one-dimensional global Beam Stiffness matrix. Numerical comparisons with ABAQUS simulations are performed for box and cylindrical Beams with a variety of lamina layups under various loading conditions and excellent agreements are observed. The effect of material anisotropies on the shell wall mid-surface shear strain has significant influence on the accuracy of modeling. In contrast, the axial warping effect has a negligible influence in cases considered. Significant deficiency of some existing models is revealed.