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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。
Based on the ABAQUS software, a three-dimensional dynamic analysis model of metro station is established. In order to eliminate the influence of truncated boundary, the boundary is simulated by finite element method. Elasto - plastic constitutive models conforming to the Mohr - Coulomb yield criterion are adopted for the soil. The calculation results show that the finite element method in ABAQUS is feasible in dealing with the dynamic problem in semi-infinite domain, and the accuracy meets the engineering requirements. The largest part of the structure is the longitudinal cross-section of the station. Therefore, the station structure is calculated according to the plane problem Which is the most important factor for the seismic response of the station. The displacement of the station under different earthquake waves is significantly different from the response time of the acceleration response, and some influencing laws are given preliminarily.