“站桥合一”高架车站动力响应影响参数研究

Research on the influencing parameters of the dynamic responses of the elevated station with “integral station-bridge system”

为探究“站桥合一”型高架车站在不同车速工况以及不同结构参数情况下,列车通过车站引起的动力响应问题,以某典型“站桥合一”型车站为例,建立列车-轨道-车站系统空间耦合振动仿真分析模型,分析列车通过引起的车站站台层与站厅层的动力响应,讨论车站振动随车速变化的规律,通过对比计算结果与现场实测数据,验证模型的准确性。在此基础上,重点分析在列车车速相同的情况下,不同轨道梁梁高、站厅层框架柱尺寸、承轨层楼板厚度、站厅层和站台层楼板厚度分别对车站结构动力响应的影响。研究结果表明:站厅层竖向位移随车速增加呈现增大趋势,而车站结构的横向、纵向位移随车速的增大均呈现先增大后减小的趋势;车站结构的竖向加速度随车速增加呈增大趋势,且竖向加速度响应明显大于横向和纵向加速度响应,站厅层横向与纵向加速度响应随车速增大呈增大趋势;对此类车站而言,增大承轨层楼板厚度,对减小车站结构的动力响应作用最为明显,站厅层和站台层楼板的动力响应都有明显减小;增大站台层楼板厚度,仅站台层楼板的动力响应有所减小;增大轨道梁高度,仅站台层楼板的竖向位移响应有明显的减小;增大站厅层截面柱尺寸和站厅层楼板厚度,则对车站结构的动力响应影响很小。

This paper investigated the influences of train speed and structural parameters on the dynamic responses of “building-bridge integration” railway station. A numerical model considering the train-track-station coupling vibration was established to analyze the effect of the train speed on the dynamic responses of the station platform and hall. Then a case study of a typical “building-bridge integration” railway station was carried out to validate the accuracy of the proposed numerical model by comparing the calculated dynamic responses with the filed test data. Based on the verified the numerical model and considering a constant train speed, the effects of track-beam height, station-hall frame dimension, track-bearing slab thickness, and the station hall and platform slab thickness on the overall structural dynamic responses were studied. Results show that while the vertical displacement of the station hall floor increases with the train speed, both the lateral and longitudinal displacement of the station structure show an initial increasing and then decreasing trend. Meanwhile, the vertical acceleration of the station structure increases with the train speed, and the value is much greater than that of the transverse and longitudinal ones. Besides, the transverse and longitudinal acceleration responses of the station-hall floor also increase with increasing train speed. It was found that for such stations, increasing the thickness of the trackbearing floor slab has the most significant effect on reducing the structural dynamic responses of the station-hall and platform floors. However, when the thickness of the platform-floor slab increases, only the dynamic responses of the platform floor reduced. Similarly, increasing the track-beam height can only effectively mitigate the vertical dynamic responses of the platform floor. Results also show that increasing station-hall column size and slab thickness had marginal effect on the dynamic responses of the station structure.