考虑几何非线性和材料非线性,建立了适用于钢框架非线性动力分析的简洁且有效的数值程序。通过采用拉弯或压弯下梁柱节点稳定性求解中的稳定函数来考虑几何非线性。通过追踪横截面上整合点处沿杆长方向每个纤维的单轴应力-应变关系,确定横截面上沿杆长方向的的塑性发展。通过采用平均加速度方法的计算机程序,求解动力方程。与ABAQUS程序计算结果对比,验证了本程序的准确性和计算效率。 Considering geometric nonlinearity and material nonlinearity, a simple and effective numerical procedure for nonlinear dynamic analysis of steel frame is established. Geometrical nonlinearity is considered by using the stability function in solving the stability analysis of beam-column joint under tension or bending. The plastic development of the cross-section along the length of the rod is determined by tracking the uniaxial stress-strain relationship of each fiber along the length of the rod at points of consolidation on the cross-section. The power equation is solved by a computer program that uses the average acceleration method. Compared with the results of ABAQUS program, the accuracy and computational efficiency of this program are verified.