蒙皮支撑柱的静力性能分析

本文提出了蒙皮支撑柱在静力荷载作用下的几何非线性有限元分析方法。钢构件、蒙皮和连接件分别被离散成空间薄壁开口截面梁柱单元、等效正交各向异型板壳单元和连接单元。采用修正的拉格朗日描述建立结构的非线性平衡方程，利用柱面弧长增量法并在每一增量步中采用修正的牛顿·拉夫逊方法进行迭代来跟踪平衡路径。通过试验对该方法进行了验证并利用该方法分析了蒙皮支撑Ｃ型截面轴心受压柱的基本受力性能。结果表明，蒙皮的支撑作用可以改善柱的受力性能并提高其承载能力。

Static Analysis of Diaphragm Braced Columns

The finite element method for geometric nonlinear analysis of diaphragm braced columns understatic loading is presented in this paper. In this method, the columns are treated as three dimensionalthin-walled open section beam elements. The diaphragm is treated as an equivalent orthotropic flatsheet. Connection elements are used to model the behavior of connectors. An updated Lagrangianformulation is adopted to establish the structural nonlinear equilibrium equation. Variable cylindricalarc length method has been used together with the modified Newton-Raphson method as the iterationstrategy to trace the equilibrium paths. Two tests were conducted on diaphragm braced channelcolumns only under eccentric loading to verify the theory and program proposed in this paper. Usingthis method, the behavior of diaphragm braced channel column under centrical loading was investigated. The research results indicate that the diaphragm bracing can improve the behavior of columnsobviously and increase their load carrying capacity accordingly.