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地铁车站侧墙大面积开洞接风道三维地震响应

Keywords: 侧墙大面积开洞,地铁车站,三维数值模型,地震反应特性

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Abstract:

基于有限差分软件FLAC3D计算平台,建立典型地铁车站侧墙大面积开洞接风道空间结构的数值模型,研究了其在水平地震动作用下的三维地震响应特性,确定了结构的薄弱部位,结果表明:车站边墙开洞处出现了较大的应力集中区,地铁车站负二层柱的最大或最小主应力总体上比负一层柱的大;与完整单体车站相比,车站侧墙开洞接风道结构的应力和变形幅值均比其相应位置大很多,而开洞处边墙的加速度响应却较小;因开洞使得洞口处下边墙加速度减小的幅度比上边墙的大;单体车站结构负二层的相对水平位移峰值比负一层的大,而侧墙大面积开洞处车站横断面负一层的相对水平位移峰值比负二层的大;同等条件下,输入地震动的主频分布范围越宽,地铁车站结构的变形与内力越大;中柱与顶板连接部位、侧墙开洞处的四周墙体及其附近区域柱子是结构抗震的薄弱部位.

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