软土地区地铁中庭式车站地震动作用的响应分析

Seismic Response Analysis of Atrium-style Metro Station in Soft Soil Area

中庭式地铁车站可以突破地下空间的封闭性,然而中庭大开口使得结构楼层平面构件不连续。针对上海软土地区采用的同时具有标准两层三跨式箱型结构和大开口中庭式结构的特殊形式地铁车站,通过建立土体和结构的全三维有限元模型,研究车站结构在水平横向、水平纵横双向,以及水平双向与竖向三种方式设防烈度地震作用下的响应。结构的位移以及内力响应分析表明,中庭式车站结构地震响应存在空间效应,水平纵向和竖向地震动分量对结构均有较大影响。

Atrium-style metro station opens up the enclosed underground space.However,it will lead to discontinuity in horizontal structure where the atrium is located.Targeting special form metro station in Shanghai soft soil area with both standard 2-storey 3-span box structure and large opening atrium structure,by establishing a soil-structure full 3D finite element model,seismic response of station structure under three ways of earthquake excitation including horizontal input from lateral direction,horizontal input from lateral and longitudinal direction,and horizontal input from both direction and vertical input is studied.Structure displacement and internal force response analysis indicate that there is spatial effect in seismic response of atrium-style metro station structure,and horizontal input from both longitudinal direction and vertical direction earthquake motion components have relatively strong impact on seismic response.