青岛地铁某地下车站结构抗震数值模拟计算分析

为了研究地铁地下车站在地震荷载作用下的受力情况,以青岛地铁某明挖地下车站为例,通过静力法和时程分析法分别建立二维数值模型,对明挖地下车站标准断面的受力进行结构抗震性能模拟分析;对车站大里程端节点结构建立三维数值模型,进行结构抗震性能模拟分析。车站标准断面二维模拟计算结果表明,时程分析法与静力法2种计算方法得到的内力计算结果比较接近,顶板跨中、底板支座、底板跨中、侧墙支座、侧墙跨中均受静力法计算结果控制,顶板支座、中板支座、中板跨中受时程分析法控制,对比基本荷载组合、准永久荷载组合的内力及相应的配筋计算,地震荷载组合对车站结构各构件承载力并不起控制作用;大里程端节点结构三维模拟分析结果表明,车站结构各构件满足抗震设计要求。

Numerical simulation analysis of seismic resistance of a Qingdao subway station structure

In order to study the stress of underground subway station under the effect of seismic load, taking an cut & cover underground subway station in Qingdao as an example, twodimensional numerical model is established by static method and time domain analysis method respectively to simulate the structural seismic performance of the standard section of cut & cover underground station, and a three-dimensional numerical model is established for the interface structure of outbound end of the station to carry out the structural seismic performance analysis and seismic performance simulation analysis. The two-dimensional simulation results of the station standard section show that the internal forces calculated by the time domain analysis method and the static method are relatively similar. The calculation results of the roof midspan, the plate support, the plate midspan, the side wall support and the side wall midspan are all controlled by the static method. The roof support, the middle plate support and the middle plate midspan are controlled by the response displacement method. Compared with the basic load combination and the quasi permanent method, the internal force of the load combination and the corresponding reinforcement calculation, the seismic load combination has no control effect on the bearing capacity calculation of each component of the station structure. The three-dimensional simulation analysis results of the outbound end interface show that each component of the station structure meets the seismic design requirements.