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本文论述了变截面有限梁元几何非线性分析方法；研究了变截面刚架的几何非线性影响；通过非线性屈曲分析考察了屋面均布荷载对刚架柱稳定的影响；计算结果表明，刚架在屋面均布荷载作用下所产生的横梁轴力和弯曲变形对其侧向屈曲荷载的影响不能忽视。
In this paper, the geometric nonlinear analysis of finite element beam with variable cross section is discussed. The geometric nonlinearity of the cross-section rigid frame is studied. The influence of uniform load on the stability of rigid frame column is investigated by nonlinear buckling analysis. The influence of axial force and bending deformation of beam on the lateral buckling load caused by the uniform load on the roof can not be neglected.