地下多层地铁车站结构抗震设计对比分析

Comparative Analysis of Structural Seismic Design of Multi-storey Underground Subway Station

为研究地下多层地铁车站的抗震设计差异,基于一维场地分析采用整体式反应位移法和等效线性化时程分析法对地下二、三、四层地铁车站进行了结构抗震分析,主要从层间位移角、构件截面配筋以及柱轴压比等方面进行了对比研究。结果表明:通过一维场地分析方法确定的土层参数以及基岩波能够满足整体式反应位移法和等效线性化时程分析法的输入条件;在E2、E3地震作用下,多层地铁车站下一层的层间位移角总是大于上一层的层间位移角;底层的层间位移角随地铁车站总层数的增多而增大,地下三、四层地铁车站的底层层间位移角明显大于地下二层地铁车站;底层中柱随地铁车站总层数的增多地震反应明显增强;地铁车站构件配筋可能出现受地震作用参与的荷载组合控制情况,地铁车站结构的抗震分析不容忽视。

In order to study differences of seismic design of multi-story underground subway stations, based on the one-dimensional field analysis, the structural seismic analysis of underground two-story, three-story and four-story subway stations are analyzed by the integrated seismic displacement method and the viscous-elastic time history analysis method. The comparative study is carried out from the aspects of inter-story displacement angle, component reinforcement and axial compression ratio of column. The results show that the soil parameters and bedrock wave determined by one-dimensional field analysis can meet the input conditions of the integrated seismic displacement method and the viscous-elastic time history analysis method. Under the action of E2 and E3, the inter-storey displacement angle of the lower layer is always larger than that of the upper layer;One at bottom floor increases with the increase of total number of floors. The inter-story displacement angle at bottom floor at underground three-storey and underground four-storey are obviously larger than that at two-story;The seismic response of columns at bottom floor increases obviously with the increase of total number of subway station floors;The component reinforcement of the station may be controlled by load combination involved in seismic action. The seismic analysis should be emphasized in the structural design of subway station.