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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。
This paper presents a geometric nonlinear finite element analysis method for skin support columns under static load. The steel members, skins and connectors are discretely divided into spatial thin-walled open-section beam column elements, equivalent orthotropic plate and shell elements, and connection elements. A modified Lagrangian description was used to construct the nonlinear equilibrium equations of the structure, using the cylindrical arc length increment method and iteratively tracking the balanced path using the modified Newton-Lavesson method in each increment step. The method was validated by the test and the basic mechanical properties of the C-section axially compressed column supported by the skin were analyzed. The results show that the support of the skin can improve the force performance of the column and increase its carrying capacity.