折线型恢复力模型是地震弹塑性时程分析常用的本构关系，其拐点的处理直接影响结构地震响应的精度。将线性插值法用于拐点处理，并结合多自由度体系的特点，使拐点处理方法能满足结构地震响应程序计算的要求。采用一个多自由度层模型算例进行弹塑性时程分析，并将拐点处理与未作处理的结果进行对比，较系统地分析了拐点处理对结构地震响应的幅值、频率和相位等的影响。%The polyline force restoring model is commonly used in explaining the constitutive relation structure for the seismic elastic-plastic time history analysis , and the inflection point processing directly affects the accuracy of the structural seismic response .The linear interpolation method was used in the in-flection point processing , and the characteristics of the multi degree freedom system were combined , which enabled the inflection point processing method to meet the requirements for program calculation in the structural seismic response .It provides a multi degree freedom layer model for the elastic-plastic time history analysis , and compares the results of the inflection point processing with those when the inflection point is not processed .Eventually , it analyses systematically the influence of the inflection point process-ing on the amplitude , frequency and phase of the structural seismic response .
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