运营列车作用下地铁车站与临近立交桥的振动响应特性

依托太原地铁2号线西涧河站与尖草坪立交桥共建工程,将模拟的列车振动荷载施加在地铁铁轨上,同时对地铁列车施加速度场,提取地铁车站与临近立交桥不同位置的速度,加速度及位移值进行振动响应特性分析。结果表明:地铁车站各断面上同一部位测点的振动响应变化规律相似,即地铁列车通过该测点时,其振动响应最剧烈;地铁列车通过监测断面时,该断面上地铁车站与立交桥的振动响应最明显;同一监测断面地铁车站有车行驶层梁、柱和底板的振动响应均大于无车行驶层,无车行驶层和有车行驶层底板的振动响应均最明显;同一监测断面立交桥承台顶的振动响应大于桥墩顶。

Vibration Response Characteristics of Metro Station and Nearby Overpass Under the Action of Operating Train

Relying on the joint construction project of Xijianhe station of Taiyuan Metro Line 2 and JiancaopingOverpass,the simulated train vibration load was applied to the metro track,at the same time,the velocity field wasapplied to the metro train.The vibration response characteristics were analyzed by the values of speed,acceleration anddisplacement extracted at different positions of the metro station and nearby overpass.The results show that the variationlaw of vibration response of measuring points at the same location on each section of the metro station is similar,that is,when the metro train passes the measuring point,its vibration response is the most severe.Also,when the metro trainpasses the monitoring section,the vibration response on this section of the metro station and the overpass is the mostobvious.On the same monitoring section of the metro station,the vibration response of the beam,column and slab at thelayer with metro train are greater than those at the layer without metro train,and the slab vibration response at the layerboth with and without metro train is of the most obvious at its layer.The vibration response on the top of overpass cap isgreater than that on the top of overpass pier on the same monitoring section.