钢管混凝土中柱地铁车站结构地震响应规律  

Seismic response of subway station structure with concrete-filled-steel-tube middle columns

作　　者：钟紫蓝 郭庆龙 郭佳希 张卜 赵密[1] ZHONG Zilan;GUO Qinglong;GUO Jiaxi;ZHANG Bu;ZHAO Mi(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]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：《岩土工程学报》2023年第S02期159-164,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金面上项目(52378470);国家自然科学基金国际(地区)合作与交流项目(52220105011)。

摘　　要：为提高和改善地下结构抗震性能,现有地铁车站结构通常采用钢管混凝土中柱,主要考虑混凝土中柱类型对地铁车站结构的地震响应影响,以两层三跨地铁车站作为研究对象,采用OpenSees有限元软件建立土-地铁车站结构二维整体有限元模型,并基于合成人工地震动输入土-地铁车站结构整体有限元模型,对模型进行非线性时程分析,研究钢管混凝土中柱地铁车站地震响应规律。结果表明:多遇地震动和设防地震动作用下,钢管混凝土地铁车站顶层中柱最大层间位移角相较于钢筋混凝土地铁车站分别降低了5%和1%,底层中柱最大层间位移角下降幅度仅为24%和8%;罕遇地震动作用下,钢管混凝土中柱使地铁车站顶层和底层最大层间位移角分别降低了9%和7%,钢管混凝土中柱底部在最大变形时刻承受的剪力增加了7%;极端地震作用下,地铁车站结构产生较大变形,钢筋混凝土中柱出现破坏时刻钢管混凝土中柱并未破坏,钢管混凝土中柱对地铁车站结构抗震性能提升作用显著。In order to improve the seismic performance of underground structures,the concrete-filled steel tube(CFST)middle column is usually used in the existing subway station structures.The influences of concrete middle columns type on the seismic response of subway station structures are considered.A comprehensive 2D finite element model for a two-story and three-span subway station,considering the nonlinear dynamic soil-subway station structure interaction,is established using the OpenSees in this study.By utilizing the ynthetic artificial seismic ground motion inputs and conducting the nonlinear time history analysis on the model,the seismic response patterns of subway station with CFST middle columns are investigated.The results indicate that the maximum inter-story drift ratios of the top-level columns of the CFST subway station decrease by 5%and 1%under both the frequent and design-basis seismic ground motions,respectively,compared to those of the reinforced concrete subway station.The maximum inter-story drift ratios of the bottom-level columns is reduced by only 24%and 8%.The CFST middle columns reduce the maximum inter-story drift ratio of the top and bottom levels of the subway station by 9%and 7%under the rare seismic ground motions,respectively.The maximum shear force at the bottom of the CFST middle columns increases by 7%at the maximum deformation moment.The subway station structures exhibit significant deformations under the extreme seismic ground motions.The CFST middle columns are not damaged at the moment of damage in the reinforced concrete middle columns.The CFST middle columns significantly enhance the seismic resistance of subway station structures.

关 键 词：钢管混凝土 地铁车站 非线性时程分析 土-地铁车站结构相互作用 

分 类 号：TU443[建筑科学—岩土工程]