中文摘要：

根据荷载扰动法实现平衡路径转换的基本原理，提出了使用通用有限元分析软件确定结构分叉点和跟踪分支路径的四步加-卸栽法，并使用ANSYS按该方法对两个分叉点失稳结构作了几何非线性稳定性分析，说明了该方法求解结构分叉点失稳的有效实用性。

英文摘要：

Based on fundamental principle of loading - perturbation method to shift equilibrium path, the paper presents four - step loading - unloading procedure to pinpoint the bifurcation point between the initial equilibrium path and the branching one and trace the branch paths using general FEA software. Then, the nonlinear stabilities of two simple structures subject to bifurcation buckling are analyzed using ANSYS to illustrate further the efficiency of this method.