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Title:: Study on Failure Modes of Base-isolated Structures Based on IDA Method

Author(s):: JIN Jianmin; XIAO Ji; TAN Ping; LIU Yanhui; HUANG Xiangyun; (Earthquake Engineering Research & Test Center，Guangzhou University，Guangzhou 510405，Guangdong，China)

Keywords:: base-isolated structures; IDA method; failure modes; seismic performance

摘要:: 为研究基础隔震结构的失效模式，提高该类结构的抗震性能，采用OpenSees建立了考虑上部结构非线性的基础隔震结构模型。首先，从太平洋地震工程研究中心地震动数据库（PGMD）选择11条与抗震规范反应谱吻合较好的地震动，然后，根据隔震层及上部结构失效准则，基于增量动力分析（IDA）方法，识别了基础隔震结构的失效模式；最后，采用不同的加强方案，优化基础隔震结构的最弱失效模式。结果表明:虽然各条地震动输入下的IDA分析结果有所差异，但均为隔震层首先失效，然后上部结构失效；通过同时加强隔震层及上部结构的薄弱构件，可有效提高基础隔震结构的抗震性能。

Abstract:: In order to study failure modes of base-isolated structures and improve the seismic performance of this kind of structure，a base-isolated structure model considered the nonlinearity of the superstructure is established by OpenSees.Firstly，11 ground motions are selected from the PEER ground motion database（PGMD），which are in good agreement with the response spectrum of seismic code.Then，according to the failure criterion of the isolation layer and the superstructure，the failure modes of the base-isolated structure are identified based on incremental dynamic analysis（IDA）method.Finally，the weakest failure mode of the base-isolated structure is optimized by different strengthening schemes.The results show that although there are some differences in the result of IDA under each ground motion input，the failure of the isolation layer occurs first，and then the superstructure fails.The seismic performance of base-isolated structures can be effectively improved by strengthening the isolation layer and the weak components of the superstructure at the same time.