摘要
以北京地铁28号线京广桥站地下结构为工程背景,介绍了车站换乘厅结构所处的水文地质情况及结构设计方案,采用数值模拟的手段对结构施加地震荷载,分析考虑了土与结构相互作用SSI(Soil-Structure Interaction)效应下的车站换乘厅主体框架结构、地连墙以及桩基础的结构动力学响应。结果表明:①在车站换乘厅的框架结构中,底板所受内力大于顶板内力结果;车站换乘厅的下部地连墙所受到的内力均大于上部地连墙的内力结果;桩体承担的剪力均大于上部结构的剪力值。②三条地震波作用下的层间位移角结果均小于1/550,符合规范要求;在两条自然地震波作用下的顶点位移均呈现出“平稳-振荡-收敛”的变化趋势,而人工波作用下的顶点位移呈现出了一定的“振荡-收敛”趋势。虽然与自然波相比无平稳阶段,但是人工波作用下的顶点位移时程整体波形较为均匀。③三条地震波作用下的结构基底剪力与地震波的加速度浮动有关。考虑SSI效应后地铁车站换乘厅结构的地震响应更加真实,可以帮助工程中采取更有针对性的措施。
Taking the underground structure of Jingguangqiao Station of Beijing Metro Line 28 as the engineering background,the hydrogeological conditions and structural design scheme of the station transfer hall structure are introduced.The seismic load is applied to the station transfer hall structure by means of numerical simulation,and the structural dynamic responses of the main frame structure,groundwall and pile foundation of the station transfer hall considering SSI(Soil-Structure Interaction)effect were analyzed.The results show that:(1)In the frame structure of the station transfer hall,the internal force of the floor is higher than that of the roof.The internal force of the side wall and the lower side wall of the station transfer hall is higher than that of the superstructure.(2)The results of interlayer displacement angle under the action of three seismic waves are allless than 1/550,which meets the requirements of the code.The top displacement of the station transfer hall under the action of two natural seismic waves shows a trend of"stationary-oscillation-convergence",while the top displacement under the action of artificial waves shows a certain trend of"oscillation-convergence".Although there is no stationary phase compared with the natural waves,the overall waveform of the vertex displacement time history under the action of artificial waves is more uniform.(3)The base shear of the structure under the action of three seismic waves is related to the acceleration fluctuation of the seismic wave.The seismic response of subway station transfer hall considering SSI effect is more realistic,and it can help to take more targeted measures in the project.
作者
姜滨
JIANG Bin(China Railway 18th Bureau Group Municipal Engineering Co.,Ltd.,Tianjin 300222,China)
出处
《国防交通工程与技术》
2023年第3期13-17,共5页
Traffic Engineering and Technology for National Defence
关键词
SSI效应
地铁车站
结构动力学响应
地震波
数值模拟
SSI effect
subway station
structural dynamic response
seismic wave
numerical simulation
