平行四边形闭口薄壁杆件的空间力学行为  

Spatial Mechanical Behavior of Thin-Walled Members with Parallelogrammic Closed Cross Section

作　　者：李翠娟[1] 卫星[1] 强士中[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2010年第3期351-356,共6页Journal of Southwest Jiaotong University

基　　金：交通部西部交通建设科技项目(200431822317);国家自然科学基金资助项目(50278079)

摘　　要：为探索平行四边形闭口薄壁杆件在弯距、轴向压力作用下的力学行为,对郑州黄河公路铁路两用桥平行四边形断面的主桁杆件进行了静力试验,并通过斜弯曲理论和有限元模型分析了其空间力学行为.结果表明:在轴向压力作用下,整个截面受力均匀,腹板倾角对应力分布的影响很小;在弯矩作用下,斜弯曲引起的截面顶、底板应力分布不均匀,且不均匀程度随腹板倾角增大而增大.In order to investigate the static behavior of thin-walled members with a parallelogrammic closed cross section under a moment or an axial compression,a thin-walled member with a parallelogrammic closed cross section was tested.The theory of oblique bending was applied and a FEM model was presented to study the spatial behavior of the tested member.The results show that the distribution of stresses is uniform in the whole cross section under an axial compression,and the effect of web inclination on the stress distribution is slight.Under a moment,the distribution of stresses in the top and bottom plates of the cross section is uneven because of oblique bending and is influenced significantly by the web inclination.

关 键 词：斜拉桥 平行四边形截面 闭口薄壁杆件 应力分布 斜弯曲 

分 类 号：TU378.7[建筑科学—结构工程] U448.27[建筑科学—桥梁与隧道工程]