The shear deformable thin-walled composite beams with closed cross-sections have been developed for coupled flexural, torsional, and buckling analyses. A theoretical model applicable to the thin-walled laminated compo...The shear deformable thin-walled composite beams with closed cross-sections have been developed for coupled flexural, torsional, and buckling analyses. A theoretical model applicable to the thin-walled laminated composite box beams is presented by taking into account all the structural couplings coming from the material anisotropy and the shear deformation effects. The current composite beam includes the transverse shear and the restrained warping induced shear deformation by using the first-order shear deformation beam theory. Seven governing equations are derived for the coupled axial-flexural-torsional-shearing buckling based on the principle of minimum total potential energy. Based on the present analytical model, three different types of finite composite beam elements, namely, linear, quadratic and cubic elements are developed to analyze the flexural, torsional, and buckling problems. In order to demonstrate the accuracy and superiority of the beam theory and the finite beam elements developed by this study,numerical solutions are presented and compared with the results obtained by other researchers and the detailed threedimensional analysis results using the shell elements of ABAQUS. Especially, the influences of the modulus ratio and the simplified assumptions in stress-strain relations on the deflection, twisting angle, and critical buckling loads of composite box beams are investigated.展开更多
理想化结构单元法(ISU M )已经成为评估结构系统中承受载荷能力的一个有效工具。本文给出了最新的ISU M 板元公式,并考虑了双轴向推力和横向载荷对板元的加载。为了精确地模拟加筋板的性能,分别用梁—柱元和板元制作了肋材和板材的模型...理想化结构单元法(ISU M )已经成为评估结构系统中承受载荷能力的一个有效工具。本文给出了最新的ISU M 板元公式,并考虑了双轴向推力和横向载荷对板元的加载。为了精确地模拟加筋板的性能,分别用梁—柱元和板元制作了肋材和板材的模型。与有限元分析(FEA )的比较表明该方法对解决加筋板在横向压力和推力载荷下的问题是适用的。对箱形桁材的四点弯曲试验的分析表明与试验数据吻合良好。展开更多
基金part of a research project supported by Korea Ministry of LandTransportation Maritime Affairs (MLTM) through Core Research Project 1 of Super Long Span Bridge R&D Centersupported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education,Science and Technology (2012R1A1A2007054)
文摘The shear deformable thin-walled composite beams with closed cross-sections have been developed for coupled flexural, torsional, and buckling analyses. A theoretical model applicable to the thin-walled laminated composite box beams is presented by taking into account all the structural couplings coming from the material anisotropy and the shear deformation effects. The current composite beam includes the transverse shear and the restrained warping induced shear deformation by using the first-order shear deformation beam theory. Seven governing equations are derived for the coupled axial-flexural-torsional-shearing buckling based on the principle of minimum total potential energy. Based on the present analytical model, three different types of finite composite beam elements, namely, linear, quadratic and cubic elements are developed to analyze the flexural, torsional, and buckling problems. In order to demonstrate the accuracy and superiority of the beam theory and the finite beam elements developed by this study,numerical solutions are presented and compared with the results obtained by other researchers and the detailed threedimensional analysis results using the shell elements of ABAQUS. Especially, the influences of the modulus ratio and the simplified assumptions in stress-strain relations on the deflection, twisting angle, and critical buckling loads of composite box beams are investigated.
文摘理想化结构单元法(ISU M )已经成为评估结构系统中承受载荷能力的一个有效工具。本文给出了最新的ISU M 板元公式,并考虑了双轴向推力和横向载荷对板元的加载。为了精确地模拟加筋板的性能,分别用梁—柱元和板元制作了肋材和板材的模型。与有限元分析(FEA )的比较表明该方法对解决加筋板在横向压力和推力载荷下的问题是适用的。对箱形桁材的四点弯曲试验的分析表明与试验数据吻合良好。
