浅埋地下结构的三维地震响应分析
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（1 广东技术师范学院天河学院，广州 510540； 2 大连理工大学，大连 116024；3中南电力设计院，武汉 430071）[摘要] 基于ABAQUS软件建立了地铁车站的三维动力分析模型，为了消除截断边界的影响,边界采用无限元模拟。土体有限域采用服从摩尔-库伦屈服准则的弹塑性本构模型。计算结果表明:ABAQUS中的无限元在处理半无限域的动力问题是可行的，精度满足工程要求；结构受力最大部位为车站纵向跨中横截面,因此,车站结构按平面问题计算是偏于安全的；地震荷载引起柱端弯矩增幅最大,其次是侧墙,对板影响最小；不同地震波作用下车站的位移响应时程和加速度响应时程具有显著差别，初步给出了一些影响规律。[关键字] 地铁车站结构；三维计算模型；地震响应中图分类号： TU924 文献标识码：A 文章编号：1002-848X(2013)S2-0076-05作者简介：作者简介：郑小琼，硕士，讲师，研究方向为地下结构抗震，E-mail:zhengpingyi1987@163.com。3D seismic response analysis of Shallow underground structureZheng Xiaoqiong1， Fan Shuli2，LiWeidong3(1 Tanhe College of Guangdong Polytechnic Normal University, Guangzhou 510540, China; 2 Dalian University of Technology, Dalian 116024, China; 3 Central Southern China Electric Power Design Institute, Wuhan 430071, China)Abstract: In this paper, a 3-D numerical calculation model of subway station structure is established by ABAQUS meanwhile infinite elements is used to simulate the boundary to eliminate the influence of the intercept boundary. In this model, the M-C model is proposed to describe non-linear dynamic characteristic of the soil. It is shown from the calculation results that：it is feasible and can meet the accuracy requirement that the infinite element deals with the dynamic analysis of semi-infinite foundation in ABAQUS;the maximum values of inner forces and deformation both appeared in the cross section, which is in the middle of structure along the longitudinal direction．Therefore, it tend to safe to design the structure according to the results obtained by plain strain assumption；seismic load has maximum effect on the moment of column．second is sidewall and the last is backplane．the ending moment of the column caused by seismic load has the largest increase. Sidewalls are second and the backplane is at the bottom of the table;there is a significant difference in the time history of earthquake acceleration and displacement under different earthquakes. The rules of variation are generalized in this paper.Keywords: subway station structure; 3D calculation model; seismic response
