双向地震动作用下单拱大跨地铁车站结构地震响应分析  

Seismic Analysis of Single-arch and Large-span Subway Station Structure under Bidirectional Ground Motion

作　　者：项宝 孙佳佳 周楠 Xiang Bao;Sun Jiajia;Zhou Nan(Guangzhou Metro Design&Research Institute Co.,Ltd.,Shenzhen 518000,Guangdong,China;China urban construction design&research institute,Beijing 100032,China;Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]广州地铁设计研究院股份有限公司,广东深圳518000 [2]中国城市建设研究院有限公司,北京100032 [3]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：《震灾防御技术》2023年第2期369-379,共11页Technology for Earthquake Disaster Prevention

摘　　要：地铁车站结构作为现代城市交通工程的重要组成部分,其抗震问题已成为城市工程抗震和防灾减灾研究的重点与难点。以深圳地铁3号线四期低碳城单拱大跨车站为研究对象,采用近场波动有限元方法,建立三维土-结构相互作用整体有限元分析模型。选取3条人工波和3条天然波作为输入地震动,分析水平单向地震动、水平与竖向双向地震动作用下单拱大跨地铁车站结构三维地震响应规律。研究结果表明,双向地震动作用下单拱大跨无柱结构及矩形框架有柱结构的水平位移及层间位移均略小于单向地震动作用下,但矩形框架有柱结构在竖向地震动作用下的中柱轴压比明显增加,说明单拱大跨车站结构可有效降低双向地震动作用下中柱轴压比变大的风险;双向地震动作用下的结构峰值弯矩大于单向地震动作用下,说明进行结构设计时应适当考虑竖向地震动作用的影响;单拱大跨无柱结构拱顶弯矩明显小于矩形框架有柱结构顶板跨中弯矩,改善了常规矩形框架结构顶板受力性能,但由于单拱大跨无柱结构缺少中柱竖向支撑作用,其底板及侧墙底部弯矩明显大于矩形框架有柱结构,尤其在双向地震动作用下更明显,因此单拱大跨无柱结构需加强底板及侧墙的厚度与配筋,以抵抗较大的弯矩响应。As subway being an important part of modern urban transport engineering,the earthquake resistance of subway station structure has become the key and difficult point in the research of earthquake resistance and disaster prevention and reduction of urban engineering.In this paper,a three-dimensional finite element model of soil-structure interaction for a single-arch long-span structure in the fourth phase of Shenzhen Metro Line 3 is established by using the near-field wave finite element method.Three artificial waves and three natural waves were selected as input ground motions to analyse the three-dimensional seismic response of the single-arch and large-span subway station structures under horizontal unidirectional ground motions and horizontal and vertical bi-directional ground motions.The numerical results show that the horizontal displacement and interstory displacement of single-arch long-span column-free structure and rectangular frame column-free structure under bi-directional earthquake are slightly less than those under unidirectional earthquake.However,the axial compression ratio of the columns in the rectangular frame structure increases obviously under the action of the vertical seismic motion,which indicates that the single-arch and long-span station structure can effectively avoid the risk of the increase of the axial compression ratio of the columns under the action of bi-directional ground motions;The peak moment of structure is larger than that of the structure under the action of bi-directional ground motions,which indicates that the effect of vertical earthquake motion should be considered in the structure design;The bending moment of the single-arch and large-span column-free structure is obviously smaller than that of the rectangular frame with columns,which improves the mechanical behaviour of the roof of the conventional rectangular frame structure.However,the bending moment of the bottom plate and the bottom of the side wall is obviously larger than that of the column structure of the rect

关 键 词：地铁车站 单拱大跨 地震响应 双向地震动 土-结构相互作用 

分 类 号：U231.4[交通运输工程—道路与铁道工程]