水平地震作用下T型换乘地铁车站结构变形分析

Deformation Analysis of T-shaped Transfer Metro Station under Horizontal Earthquake

地下轨道交通系统是城市生命线工程的重要组成部分,其中的换乘地铁车站建设规模大、客流量大、结构复杂,有关抗震问题值得关注。基于南京某T型换乘车站结构,建立地层-结构三维动力时程分析模型,模拟土-结相互作用系统在水平地震荷载作用下的动力响应,分析不同类型和不同幅值的地震动作用下T型换乘车站结构的位移响应规律。计算结果表明:T型换乘车站结构的最大水平位移及截面最大顶底位移差均出现在垂直于地震动输入方向的3层线路车站的顶板部位,沿3层车站的纵向位移,远离T型交叉部位;T型换乘车站结构水平位移及顶底水平位移差的最小值均发生在两线车站T型交叉部位。

Underground rail transit systems are an important part of urban lifeline system. Among them, the transfer subway station is a large-scale facility with a substantial passenger flow, and its structure is complex. Hence, its seismic performance is worthy of attention. Based on the structure of a T-shaped transfer station, a three-dimensional dynamic time-history analysis model of the stratum structure was established to simulate the dynamic response of the soil beneath a T-shaped transfer station structure system under the action of earthquake loads. The displacement response law of the T-shaped transfer station structure was analyzed. The calculation results show that the maximum displacement of the T-shaped transfer station structure and the maximum top-bottom displacement difference appeared on the roof of the three-story line station. The minimum value of the structural displacement occurred at the T-shaped intersection of the two-line station. The research results of this study have reference significance for the seismic design and analysis of T-shaped transfer stations.