济南地区地铁车站地震响应数值分析

Numerical Analysis of the Shallow-buried Subway Station Seismic Response in Jinan City

利用有限差分软件FLAC^(3D)5. 0,以大杨庄地铁车站为工程背景,建立三维抗震动力模型,并通过在基岩处输入3条人工地震波H1、H2、H3,分析了动力作用下地层中峰值加速度规律及车站主体的结构变形及内力响应规律。计算结果显示:越接近地表,地层中的峰值加速度越大;车站结构整体侧向位移呈现倒三角形状;车站结构的侧墙、中柱与各楼层板的连接处,承受较大内力,是整个车站结构抗震的薄弱部位。

The finite element software FLAC3D5.0 is used to establish a 3D seismic dynamic model based on the engineering of Dayangzhuang Station in Jinan metro.In order to analyze the rules of peak acceleration in the stratum,the deformation of station main structure and the internal force response under soil structure interaction,three artificial seismic waves H1,H2,H3 are inputted in the bedrock respectively.The simulation results reveal that the peak acceleration in the stratum becomes greater when it is closer to the surface;the overall lateral displacement of the station structure presents an inverted triangle mode;as the seismic weak places in the whole subway structure,the joints among side walls,central columns and floor plates bore relatively larger internal forces.