平行地铁车站结构的地震响应特性

Characteristics behind seismic response for parallel subway station structure

为研究平行地铁车站结构相互作用之间的地震响应影响规律,利用有限元分析软件建立了平行地铁车站结构的三维数值模型,对比分析平行地铁车站结构与单体车站结构地震反应的差异。结果表明:平行地铁车站结构的动力响应规律及损伤程度取决于地震波的频谱特性,长周期地震动作用下平行地铁车站结构的位移响应和加速度响应均大于其他地震波;平行地铁车站结构中柱两端、底板与侧墙相交位置的损伤最为严重;与单体地铁车站相比,平行地铁车站结构中柱的内力幅值相差不大,但最大层间相对水平位移与峰值加速度值相差较多,增幅分别达到了50.0%和12.9%,同时,塑性应变增幅达到了21.0%,应提高平行地铁车站结构的整体变形能力。

This paper is targeted at investigating the characteristics underlying seismic response between parallel subway station structures interaction.The investigation involves establishing a three-dimensional numerical model for parallel subway station structures using finite element analysis software,and comparing and analyzing the differences of seismic response between parallel subway station structures and single station structures.The results show that the dynamic response law and damage degree of parallel subway station structure depend on the frequency spectrum characteristics of seismic waves;the displacement response and acceleration response of parallel subway station structure are greater for long-term ground motion than for other seismic waves;the most serious damage occurs in the parallel subway station structure,the two ends of the column,the intersection of the bottom plate,and the side wall;compared with the single subway station,there is less difference observed in the internal force amplitude of the middle column in the parallel subway station structure,but a greater difference in the maximum horizontal displacement between floors and the peak acceleration,with the increase rates up to 50.0%and 12.9%respectively,accompanied by a 21.0%increase in plastic strain,necessitating an improvement in the overall deformation ability of the parallel subway station structure.