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该文定义了构件的截面损伤指标,基于增量动力分析(IDA)方法,对地震输入下结构的失效模式进行分类,进一步统计得出各失效模式下构件端部截面损伤均值。提出基于概率的地震失效模式识别方法,建立各失效模式下结构失效概率关系表达式。基于OpenSees平台,对一个20层benchmark钢框架结构模型进行数值分析,结果表明,根据关键层的损伤状态可以合理地划分失效模式,引入构件重要性系数能较好地反映各构件截面损伤对结构失效模式的影响,基于概率的地震失效模式识别方法能有效的判别结构发生各失效模式的概率大小。
This paper defines the cross-sectional damage index of components and classifies the failure modes of structures under earthquake input based on incremental dynamic analysis (IDA). Further, the mean value of the cross-section damage of each component under each failure mode is obtained. Based on the probability of earthquake failure mode identification method, the relationship between failure probability of each failure mode is established. Based on the OpenSees platform, a numerical analysis of a 20-story steel frame model is carried out. The results show that failure modes can be classified reasonably according to the damage status of critical layers. Introducing component importance coefficient can better reflect the effect of structural damage Mode, the probability-based method of earthquake failure mode identification can effectively distinguish the probability of failure modes occurring in the structure.