上海世博会世博轴变截面钢管格构柱承载力试验与数值分析  

Experimental and numerical investigation on load-carrying capacity of lattice tubular columns with variable cross sections of the Expo Axis

作　　者：王新毅[1,2] 童乐为[1] 谢恩[1] 贾良玖[1] 陈以一[1] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]南昌工程学院土木系,南昌330099

出　　处：《建筑结构》2010年第7期34-38,共5页Building Structure

摘　　要：研究了上海世博轴结构中一种新型的钢管格构柱的性能,柱子由三个肢体的圆管与一些沿柱轴线间隔布置的横隔板组成,其截面中间大、两端小,抗弯刚度非线性变化。进行了比例分别为1∶2和1∶1试件的破坏性试验,测试了钢管和横隔板等部位的位移和应变分布;应用ABAQUS软件建立有限元模型,对2个试件进行了数值分析。试验指出,这种新型的钢管格构柱的破坏模式是整体弯扭失稳,横向挠曲变形呈现S形波,两个半波在尺度上或者有点接近、或者差别很大。柱的承载力符合设计要求,横隔板与钢管直接焊接的连接方式是适宜的,所建立的有限元模型成功地模拟了试验结果,揭示了几何初始缺陷对承载力有重要影响。The behaviour of a new type of lattice tubular columns used in the Expo Axis was investigated.The column is composed of three circular tubes and some batten plates distributing at regular intervals along the column axis. Its cross section is bigger in the middle than in the two ends,with nonlinearly variable bending rigidity.Destructive tests of specimens with the scale 1：2 and 1：1 were performed respectively.The displacement and stress distributions in the tubes and batten plates were measured.Finite element model for both specimens were constructed by means of ABAQUS software and then numerical analysis were carried out.The tests indicate that the failure mode of the new type of columns is the bending-distortional buckling.Their lateral deflections are characterized by S-type wave,in which both half waves are a bit similar or quite different in size.Their load-carrying capacity meets the design needs and the connection between tube and batten plate by direct welding is suitable.The finite element model constructed is successful to numerically simulate the experimental results and points out that geometric imperfection has an important effect on loading capacity.

关 键 词：变截面钢管格构柱 极限承载力 弯扭失稳 破坏性试验 有限元分析 

分 类 号：TU473.11[建筑科学—结构工程]