场地均质性对浅埋地铁车站地下结构地震易损性的影响  

Influence of site homogeneity on the seismic fragility of shallow-buried subway station underground structures

作　　者：蒋家卫 李文彪 赵雅芝 陈国兴[1] 杜修力[2] JIANG Jiawei;LI Wenbiao;ZHAO Yazhi;CHEN Guoxing;DU Xiuli(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,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：《振动与冲击》2024年第6期151-156,178,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金青年项目(52308506);江苏省自然科学基金青年项目(BK20230336)。

摘　　要：场地条件是影响地下结构地震响应的关键因素之一,该文旨在研究场地均质性对于地铁车站地下结构地震易损性的影响。以两层两跨地铁车站为研究对象,基于ABAQUS/Standard软件平台建立了考虑土-结构相互作用的二维有限元分析模型。模型考虑了循环动力荷载作用下土体的非线性与钢筋混凝土的弹塑性力学行为。采用增量动力分析方法分别计算了结构在层层场地条件下与均质场地条件下结构的地震响应,并以层间位移角为损伤指标与地面峰值加速度为地震动强度指标绘制了地铁车站结构的地震易损性曲线。结果表明,层层场地条件下结构的响应均值要显著高于均质场地,但两者标准差一致。在地震动作用下,结构处于层层场地下的破坏概率要明显高于均质场地,这主要归因于层层场地中毗邻结构的土体产生了较大的剪切变形。上述结论可为地下结构基于性能的抗震设计提供科学参考。Site condition is one of the key factors affecting the seismic response of underground structures.The influence of site homogeneity on the seismic fragility of subway station underground structures was studied.Taking a two-story two-span subway station as the research object,a two-dimensional finite element analysis model considering soil-structure interaction was established on the ABAQUS/Standard software platform.The IDA method was used to calculate the seismic response of the structure locating in the layered site and the homogeneous site respectively.The inter-story drift ratio was selected as the damage measure and the PGA was selected as the earthquake intensity measure for building the seismic fragility curves of the subway station structure.The results show that the mean of the structure response in the layered site is significantly higher than that in the homogeneous site,while the standard deviation of the two sites are identical.Under the excitation of the ground motion records,the failure probability of the structure locating in the layered site is significantly higher than that in the homogeneous site,which is mainly due to the large shear deformation of the soil adjacent to the structure in the layered site.The finding provides a scientific reference for the performance-based seismic design of underground structures.

关 键 词：地铁车站 地下结构 场地均质性 地震易损性 

分 类 号：TU93[建筑科学—结构工程]