基于云图法地下结构易损性分析的地震动记录规模选取  

Selection of earthquake records ensembles based on cloud method applied in vulnerability of underground structures

作　　者：蒋家卫 程祖俊 许成顺[2] 杜修力[2] 陈国兴[1] 赵凯[1] JIANG Jiawei;CHENG Zujun;XU Chengshun;DU Xiuli;CHEN Guoxing;ZHAO Kai(Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 211816,China;Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]南京工业大学岩土工程研究所,江苏南京211816 [2]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《建筑结构学报》2023年第11期208-215,共8页Journal of Building Structures

基　　金：中国博士后科学基金项目(2022M711606);国家自然科学基金联合基金项目(U1839201)。

摘　　要：为了研究基于云图法的地下结构地震易损性分析中地震动记录集容量的选取,以浅埋两层双跨地铁车站结构为研究对象,采用非线性时程动力分析方法,获取了结构在不同天然地震动记录样本容量作用下的动力响应。以层间位移角为结构损伤指标,地面峰值加速度为地震动强度指标,基于对数线性回归模型建立了不同工况输入下结构的概率地震需求模型,并在此基础上建立了相应工况的结构地震易损性曲线。基于不同工况的结构震后失效概率与标准值的误差分析发现,地震动样本容量会显著影响地下结构基于云图法的地震易损性分析结果;相比于评估结构的高等级性能水准,地震动样本容量对评估结构低等级性能水准的影响更小;地下结构的失效概率评估结果会随着地震动样本容量的增加而逐渐接近标准值,其最佳地震动样本容量为300条。This paper aims to study the selection of the scale of ground motion record sets based on the cloud method applied in the seismic vulnerability analysis of underground structures.Taking a shallow-buried two-story and two-span subway station structure as a research object,the dynamic response of the structure under different natural groundotion records was obtained by using the nonlinear time-history dynamic analysis method.The inter-story drift ratio was selected as the damage measure,and the PGA was defined as the intensity measure.The probabilistic seismic demand model of the structure under different working conditions was established based on the logarithmic linear regression model,and the corresponding seismic fragility curves of the structure were established.Based on the error analysis of the post-earthquake failure probability of the structure between the standard result and the result of different working conditions,it is found that the scale of ground motion record sets could significantly affect the seismic vulnerability analysis results of the underground structure based on the cloud method.Compared with evaluating the higher-level performance of structure,the scale of ground motion record sets has less impact on the lower-level performance.The failure probability evaluation result of the underground structure will gradually approach the standard value with the increase of input scale of ground motion record sets,which suggests that 300 samples is the optimal scale of ground motion record sets.

关 键 词：地下结构抗震 地铁车站 云图法 地震动记录选取 地震易损性 

分 类 号：TU93[建筑科学—结构工程]