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以深圳某双层两跨岛式地铁车站为工程背景,考虑水平地震和水平、竖向地震耦合2种工况,采用ANSYS分析软件,研究SSI(土与结构相互作用)效应下结构的水平位移特征和内力响应规律。结果表明:与水平地震工况相比,耦合地震作用下结构最大内力增幅较大,由于竖向惯性荷载作用,产生最大内力位置不同;周围土体介质的变形与结构在震动中的变形关系密切;沿车站侧墙高度的相对水平位移在2种地震工况作用下的变化不容忽视,不可忽略竖向地震的影响,耦合地震作用下的相对水平位移可用线性曲线拟合。研究成果可为地铁车站的抗震设计提供参考。
Taking a double-deck, two-span subway station in Shenzhen as the engineering background, two kinds of working conditions of horizontal earthquake and horizontal and vertical seismic coupling are considered. By means of ANSYS software, the horizontal displacement of structure under SSI (soil-structure interaction) Characteristics and internal force response law. The results show that compared with the horizontal seismic conditions, the maximum internal force of the structure increases greatly due to the coupling earthquake, and the maximum internal force position is different due to the vertical inertial load. The deformation of surrounding soil medium is closely related to the deformation of the structure in vibration ; The relative horizontal displacement along the side wall height of stations can not be neglected under the influence of two seismic conditions. The influence of vertical earthquakes can not be neglected. The relative horizontal displacement under the coupling earthquake can be fitted by a linear curve. The research results can provide a reference for the seismic design of metro stations.