By studying the failure mechanism of a structure under seismic action,recognizing and optimizing its failure modes,the desired failure mode of the structure is achieved,it is of importance for improving the aseismic performance of structures and reducing casualties and property losses due to earthquakes.By using OpenSEES,the open system for earthquake engineering simulation,and utilizing IDA analysis method together,the seismic response of a steel reinforced concrete (SRC)frame structure was gained here,and some methods were proposed to identify the weakest failure mode of the structure.Further,some optimization schemes were presented to improve its failure modes.The results were of certain theoretical significance for the corresponding engineering applications.%研究建筑结构在地震作用下的破坏机理，通过识别和优化结构的失效模式，实现结构的破坏由理想的失效模式控制，对提高结构的抗震性能及降低结构倒塌造成的人员伤亡和财产损失具有重要的意义。以型钢混凝土框架结构为研究对象，利用地震工程模拟软件OpenSEES平台，采用增量动力分析（IDA）方法得到计算模型在地震作用下的反应，提出了结构最弱失效模式的识别方法，并提出了最佳的优化方案，对相关工程应用有一定的理论指导意义。
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