【摘要】 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.更多还原

【Abstract】 Based on the finite difference software FLAC3 Dcomputing platform, a spatial structure numerical model of typical subway station with an extensive hole in lateral wall for connecting duct was established,then its 3D seismic response characteristics under horizontal ground motion was studied.Based on the model,the weak parts of the structure were obtained. The research results show that the hole location of the station wall appeared large stress concentration,the maximum or minimum principal stress of the lower column are bigger than the upper column’s; by comparing with the complete single station,the internal force and deformation amplitude of open-hole structure are much larger than their corresponding locations,but the acceleration response of sidewall at hole location is smaller; reducing magnitude of the acceleration of lower wall caused by opening holes is larger than upper wall; the peak relative horizontal displacement of the lower floor of monomer station structure is greater than the upper’s,to the subway station structure with an extensive hole,an opposite conclusion is gotten; under the same conditions,the wider main frequency distribution range of imported vibration is,the greater the deformation and internal force of subway station structure becomes; the wall around the open hole,the connection parts of pillars and roof and pillars near the open area are the weak parts of the structure. The study results can provide reference for the seismic design of parallel subway stationstructure in future.更多还原