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本文论述了变截面梁单元平面内稳定分析方法，比较了不同类型梁单元（等截面梁单元、普通位移模式变截面梁单元、积分位移模式变截面梁单元）对变截面刚架平面内稳定分析的差异。利用上述有限元法，给出了对称刚架变截面柱计算长度系数的实用计算公式，并分析了横梁轴力对刚架柱稳定的影响。
This paper discusses the in-plane stability analysis method of variable-section beam elements and compares the in-plane stability analysis of variable-section rigid frames for different types of beam elements (equal-section beam elements, general-displacement-mode variable-section beam elements, and integral displacement model variable-section beam elements). The difference. By using the above finite element method, a practical calculation formula for calculating the length coefficient of the symmetry rigid frame variable cross-section column is given, and the influence of the axial force of the cross beam on the stability of the rigid frame column is analyzed.