摘要
基于概率地震需求分析方法,探讨了地铁车辆段上盖隔震双塔结构的薄弱部位及失效模式。首先,基于地震工程模拟平台OpenSEES,对比分析了地铁车辆段上盖非隔震双塔结构与隔震双塔结构的动力特性及减震效果。通过增量动力分析方法对地铁车辆段上盖隔震双塔结构进行了基于性能的概率地震需求分析,得到了结构各组成部分的概率地震需求易损性曲线及结构各性能水平在50年内的超越概率。研究表明:采用层间隔震技术后,上部塔楼减震效果明显,结构的主要振型为低阶上部结构平动振型及高阶下部结构平动振型;结构的失效模式为隔震层位移超限破坏先于下部结构层间位移角破坏先于上部结构层间位移角破坏;结构各性能水平在50年内的超越概率均较小,结构满足性能要求。
The weak part and failure pattern of isolated double-tower structure on the top head of metro depot were studied in this paper.First,dynamic characteristic and seismic reduction effect of non-isolated and isolated doubletower structure with large chassis were studied comparatively based on OpenSees.Then,Performance-based Probabilistic Seismic Demand Analysis(PSDA)of isolated double-tower structure with large chassis was conducted based on the Incremental Dynamic Analysis(IDA)method.The seismic fragility curve of each section in the isolated structure was obtained and the exceeding probability of each performance level of structure in 50 years was obtained combining the site seismic hazard model.The results indicate that,the seismic reduction effect of the tower building is significant,and the main vibration modes are the lower order translational vibration modes of the superstructure and the higher order translational vibration modes of the substructure.The failure of isolation layer and substructure were earlier than that of superstructure,and larger stiffness of substructure was helpful to ensure the early performance of it.The maximum exceeding probability of each performance level in 50 years for structure was relatively small,so that the requirement of performance levels can be satisfied.
作者
刘伯权
曹国绒
张锐
邢国华
常召群
金钦凯
LIU Boquan;CAO Guorong;ZHANG Rui;XING Guohua;CHANG Zhaoqun;JIN Qinkai(School of Civil Engineering,Chang'an University,Xi'an 710061,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2022年第3期11-21,共11页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(51578077,51978076)
陕西省青年科技新星项目(2021KJXX-17)。
关键词
地铁车辆段上盖双塔结构
层间隔震结构
减震效果
地震需求易损性分析
地震需求危险性分析
double-tower structure built on the top head of metro depot
inter-story isolated structure
seismic reduction effect
seismic demand fragility analysis
seismic demand hazard analysis
