基于IDA的基础不均匀沉降张弦梁结构的地震易损性分析  

Seismic vulnerability analysis of beam string structurewith uneven foundation settlement based on IDA

作　　者：柳明亮 王常浩 张虎 何晴光[2,3] LIU Mingliang;WANG Changhao;ZHANG Hu;HE Qingguang(Shaanxi Architecture Science Research Institute Co.,Ltd,Xi’an 710082,China;Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou Universityof Technology,Lanzhou 730050,China;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou 730050,China)

机构地区：[1]陕西省建筑科学研究院有限公司,陕西西安710082 [2]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [3]西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《世界地震工程》2022年第4期72-82,共11页World Earthquake Engineering

基　　金：住建部科技计划项目(2020-K-126),陕建集团2020年科研项目(SJKT-2020-05)。

摘　　要：基于IDA方法的地震易损性分析是目前一种较为常用的建筑结构抗震性能评价方法。选取15条地震动,三向作用于结构,对影响最大的两类支座分别施加200 mm沉降量后的模型和未沉降模型基于IDA方法进行地震易损性分析。结果表明:在地震动强度较小时,短柱端支座沉降模型由于预应力增加会使结构相比与未沉降模型更加趋于稳定;当地震动强度较大时,短柱端支座沉降模型的破坏概率随着地震动强度的增加而迅速增加,此时未沉降模型的破坏概率将大幅低于另外两类模型。Seismic vulnerability analysis based on IDA method is a commonly used seismic performance evaluation method of building structures.The seismic vulnerability of the model and the model without settlement after apply⁃ing 200 mm settlement to the two types of bearings with the greatest impact is analyzed based on IDA method.The results show that when the ground motion intensity is small,the increase of prestress caused by the settlement of short column end support slightly improves the stability of the structure compared with the non settlement model;When the local seismic intensity is large,the failure probability of the settlement model of the short column end support increases rapidly with the increase of the seismic intensity.At this time,the failure probability of the non settlement model will be significantly lower than that of the other two types of models.

关 键 词：张弦梁结构 支座局部沉降 地震易损性分析 增量动力分析 地震动强度指标 

分 类 号：TU398.9[建筑科学—结构工程]