基于IDA的下弦与撑杆改进构型张弦梁结构的地震易损性分析  

Seismic fragility analysis of beam string structure with improved configuration of lower chord and brace based on IDA

作　　者：谢洋平 任宜春 蒋友宝 周浩 XIE Yangping;REN Yichun;JIANG Youbao;ZHOU Hao(School of Civil Engineering,Changsha University of Science and Technology,Changsha 410114,Hunan,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《工程建设》2024年第7期34-39,共6页Engineering Construction

摘　　要：采用IDA方法进行地震易损性分析,已成为评估建筑结构抗震性能的常用方法之一。为探究下弦与撑杆改进构型张弦梁结构的抗震性能,使用ATC-63推荐的15组地震动记录数据,选择地震动强度参数结构第一自振周期结构阻尼系数为5%的反应谱加速度S_(a)(T1,5%),并以一阶振型中最大位移点的竖向挠度作为评价指标进行研究。基于有限元软件ANSYS对该结构进行模拟,通过对比时程分析结果,分析不同损伤状态下改进构型的张弦梁结构的抗震性能概率。研究结果表明:在面对大型地震时,此改进构型的张弦梁结构表现出卓越的抗震性能,拥有显著的防震潜力,且结构倒塌的风险较低。The IDA method for seismic fragility analysis has become one of the common methods to evaluate the seismic performance of building structures.In order to explore the seismic performance of the beam string structure with improved configuration of lower chord and brace,15 sets of ground motion recording data recommended by ATC-63 are used to select the response spectrum acceleration S.(T1,5%)of the first natural periodic structure of the earthquake motion strength parameter structure with a damping coefficient of 5%,and the vertical deflection of the maximum displacement point in the first-order mode shape is taken as the evaluation index for research.Based on the finite element software ANSYS,the structure is simulated,and the seismic performance probability of the improved configuration of the beam string structure under different damage states is analyzed by comparing the time course analysis results.The results show that in the face of large-scale earthquakes,the improved configuration of the beam string structure shows excellent seismic performance with significant seismic potential and low risk of structural collapse.

关 键 词：张弦梁 地震易损性分析 地震强度指标 失效概率 增量动分析 

分 类 号：TU312.3[建筑科学—结构工程]