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采用在ABAQUS软件上开发实现的土体动非线性黏弹性模型模拟土的动力非线性,采用J.Lee提出的混凝土动力塑性损伤模型模拟隧道管片混凝土在循环荷载下的非线性特性,利用大型商业有限元软件ABAQUS对南京地区两层双柱岛式地铁车站结构的水平向非线性地震反应特性进行了数值模拟。数值分析表明:地铁车站在侧墙和顶板、中板和底板的连接处发生动应力集中现象,其中尤其是在中板和侧墙的连接部位动应力反应尤为严重;其次是上层中柱顶端和下层中柱底端出现很强的动拉压应力;在中板和中柱的连接部位也出现很强的动应力集中现象。这些计算结果表明,两层双柱岛式地铁车站结构的中柱和中板是地震反应最不利部位,这应引起地铁车站结构设计人员的重视。
The nonlinear soil viscoelastic model is developed by using the soil dynamic viscoelastic model developed by ABAQUS software. The dynamic plasticity model of concrete proposed by J. Lee is used to simulate the nonlinear behavior of tunnel segment concrete under cyclic loading. ABAQUS, a commercial finite element software, is used to simulate the horizontal nonlinear seismic response of double-column island metro station structure in Nanjing. Numerical analysis shows that the stress concentration phenomenon occurs at the connection between the side wall, the roof, the middle plate and the bottom plate of the metro station, especially the dynamic stress response at the connecting part of the middle plate and the side wall is particularly serious. The lower end of the column at the bottom of a strong dynamic tensile stress; in the midplane and the connection of the column also appeared strong dynamic stress concentration. These calculations show that the center column and the mid-plate of the two-storeyed double-column island metro station structure are the most adversely affected parts of the seismic response, which should attract the attention of subway station structure designers.