分析了强震作用下结构动力失效的机理以及预报结构的倒塌和确定结构的安全系数 ,根据非线性动力模型编制了NDAP(结构非线性动力分析 )程序来分析钢筋混凝土框架结构在强震作用下的反应 ,通过对框架结构的塑性铰形成过程的计算机模拟 ,分析了框架结构非线性动力失效的机制 ,并通过算例分析了二阶效应对强震作用下结构倒塌的重要影响和预告作用 The mechanism of structural dynamic failure under strong earthquakes and the prediction of structural collapse and the safety factor of the structure are analyzed. Based on the nonlinear dynamic model, NDAP (Structural Nonlinear Dynamic Analysis) program is developed to analyze the effect of strong earthquake on the structure of reinforced concrete frame The mechanism of nonlinear dynamic failure of frame structure is analyzed by computer simulation of plastic hinge formation process of frame structure. The influence and effect of second-order effect on structural collapse under strong earthquake are analyzed