基于IDA的层间隔震结构失效模式研究

层间隔震结构是由基础隔震结构发展而来的一种新型隔震结构。为研究层间隔震结构的倒塌，需先研究不同层间隔震结构的不同失效模式和失效位置，文章建立了3个不同结构参数的层间隔震结构有限元模型，选取20条与抗震规范反应谱吻合的地震动，采用增量动力分析（IDA）方法，分别对其失效模式和失效位置进行研究。研究表明:基于不同的结构参数，层间隔震的基本失效模式有三种，即隔震层水平位移超限导致结构失效、下部结构层间位移角超限导致结构失效、隔震层拉压应力超限导致结构失效；隔震层下部结构和隔震层最外边缘支座为结构的薄弱位置，应引起更多关注。此方法不仅可以研究结构的不同失效模式，还可以确定失效位置，可为下一步层间隔震结构的抗倒塌分析提供理论基础。

Research on failure mode of mid-story isolated structure based on IDA

Mid-story isolated structure is a new type of isolated structure developed from base isolated structure. In order to study the collapse of the mid-story isolated structures,different failure modes and failure locations of the mid-story isolated structures should be studied first. The article establishes three finite element models of mid-story isolated structures with different structural parameters,incremental dynamic analysis(IDA)method is used to study the failure modes separately. Research shows that based on the different structural parameters,there are three basic failure modes of mid-story isolated structure:excessive horizontal displacement of the isolated layer leads to structural failure,excessive interstory displacement angle of structure leads to structural failure,and excessive tensile and compressive stress of the isolated bearings leads to structural failure;More attention should be paid to the weak position of the structure. This method can not only study the different failure modes of the structure,but also determine the failure location,which can provide a theoretical basis for the collapse resistance analysis of the mid-story isolated structure.