为分析抗弯钢框架中的P-Δ效应,提出2个稳定系数。在弹性阶段,弹性稳定系数θme是框架的基本周期、振型的函数。在塑性阶段,非弹性稳定系数θmi仍与基本周期、振型有关,通过回归分析得到。结果表明:使用这两个稳定系数,可精确模拟考虑P-Δ效应的钢框架荷载-位移曲线,包括:初始刚度、强度、后屈服刚度等。以22个抗弯框架为例,验证稳定系数的正确性。 To analyze the P-Δ effect in a bending steel frame, two stability coefficients are proposed. In the elastic phase, the elastic stability coefficient θme is a function of the basic period and mode of the frame. In the plastic phase, the inelastic stability coefficient θmi is still related to the fundamental period and the mode shapes, and is obtained through regression analysis. The results show that the load-displacement curves of steel frame with P-Δ effect can be accurately simulated by using these two stability factors, including initial stiffness, strength and post-yield stiffness. With 22 bending frames as an example, the correctness of the stability coefficient is verified.