[提要] 简要讨论了目前框架结构整体稳定分析的一些方法及特点，提出了一种新方法——等效轴力法，该法以压弯构件在弹性阶段的边缘屈服准则为理论基础，通过分析一阶内力、计算等效轴力和利用理想框架的分枝稳定理论，简便而有效地处理了考虑轴向力、侧向力、弯矩、P-△效应、初弯曲及初偏心等各种因素的框架整体稳定问题。算例表明，等效轴力法是合理有效的。
[关键词]  等效轴力  一阶理论 二阶理论 框架结构  稳定性

The present theories and methods for global stability analysis of frames are summarized and a new method called equivalent axial force is presented. Based on the cross - section edge yield critia of compressing - bending member in elastic stage, it can handle the global stability of frames under the action of axial loads, lateral loads, bending moments, P -△effect and initial flexure etc by the steps of first - order analysis of the frame, the caculation of equival axial force and stability of the ideal frame. Numerical results show that this method is rational and effective.
Keywords: equivalent axial force; first - order theory; second - order theory; frame stability