不同类别场地大型异跨地铁地下车站结构地震反应分析  

Seismic Responses of a Large Unequal-span Underground Subway Station in Different Classified Sites

作　　者：王建宁 马国伟 庄海洋[3] 窦远明 付继赛 WANG Jianning;MA Guowei;ZHUANG Haiyang;DOU Yuanming;FU Jisai(China National Machinery Industry Co.,Ltd.,Beijing 100080,China;School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China;Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 210009,China)

机构地区：[1]中国机械工业集团有限公司,北京100080 [2]河北工业大学土木与交通学院,天津300401 [3]南京工业大学岩土工程研究所,江苏南京210009

出　　处：《应用基础与工程科学学报》2021年第2期324-336,共13页Journal of Basic Science and Engineering

基　　金：国家自然科学基金面上项目(51778290,51778282);江苏省高校自然科学基金重大项目(16KJA560001);河北省研究生创新资助项目(CXZZBS2018038)。

摘　　要：场地类别对地下结构的地震反应具有重要影响,随着地下结构横截面尺寸及其复杂程度的增加,这一影响将愈发显著.针对现有异跨地铁车站结构的特殊性,以苏州地铁工程建设为背景,通过对不同类别场地土-异跨地铁车站相互作用的120个静动耦合整体有限元数值模型结果进行分析,研究了场地类别和地震动特性对此类复杂截面地下结构地震反应的影响规律.结果表明:随着场地条件变差,车站结构楼板的峰值加速度放大系数近似呈线性减小,结构的层间水平相对位移峰值近似呈线性增大;场地类别对车站结构加速度放大效应的影响随基岩输入地震动强度的增大而逐渐减弱,结构的层间水平相对位移则随基岩输入地震动强度的增大而进一步增强;不同场地类别中的异跨车站结构受拉损伤分布位置大致相同,但随着场地条件的变差,尤其是场地类别从Ⅱ类变化为Ⅲ类时,上层悬挑边跨各构件的地震损伤程度明显加重.Seismic responses of underground structures are severely affected by the site classification,especially for structures with large cross-sectional dimensions.According to the actual engineering construction of Suzhou Metro Line 1,ten different site conditions were designed and divided into common three categories of venues.The nonlinear static and dynamic coupling finite-element model that can simulate the earthquake response among the soil and the complicated unequal-span underground subway station were built.Based on 120 operating conditions,the effects of site classification on seismic responses of underground structures were investigated.As a result,the acceleration amplification of station decreases linearly with site conditions deteriorate from Class Ⅱ site to Class Ⅳ site,and the effects of site classification on earthquake responses of unequal-span subway station are more obvious when the input peak acceleration is small.The peak acceleration magnification coefficient decreases exponentially with the increase of the input seismic intensity,while the horizontal relative displacement increases linearly.Although the subway station in different sites has the same distribution characteristics of tensile damages,the damage degree of the upper cantilever span strengthens obviously with the deterioration of site conditions,especially the site category changes from Class Ⅱ to Class Ⅲ.

关 键 词：地下结构 异跨地铁车站 场地类别 地震损伤 地震反应 土-结构相互作用 

分 类 号：TU375.4[建筑科学—结构工程]