市域轨道交通“桥建合一”高架车站车致振动响应分析

为探究列车在不同车速以及空载、满载情况下通过“桥建合一”型车站时所引起的结构振动问题,以某“桥建合一”高架越行车站为例,建立车-轨道-车站的有限元结构耦合动力分析模型,分析B型车在80~120 km/h速度下作用于站房结构及结构反作用于列车的动力响应结果,并进行舒适度评价。结果表明：当B型车以80~120 km/h通过该车站时,列车竖、横向振动加速度以及列车的乘坐舒适性均满足相关规范限值要求;承轨层竖向响应均大于横向响应,且竖向位移和竖向加速度随着车速的增加变化较小,横向位移和横向加速度随着车速的增加呈现先增大后减小的趋势;候车厅楼板的最大竖向响应均大于其横向响应,最大横向位移随着车速的增大呈现先增大后减小的趋势,最大横、竖向加速度均随着车速的增加呈现变大的趋势。通过理论计算结果与“桥建合一”车站现场实测数据的比对,验证了空间耦合振动有限元模拟计算的可靠性,可为同类高架车站结构的计算与分析提供参考。

Analysis on Vehicle-induced Vibration Response of Urban Rail Transit "Bridge and Construction Integration" Elevated Station

In order to study the structural vibration caused by a train passing through the "bridge-construction-integration" station at different speed, no load and full load, taking a "bridge-construction-integration" elevated station as an example, a finite element structure coupling dynamic analysis model of vehicle-track-station is established to analyze the dynamic response results of B-type train applied to station building structure and structure reaction on train at 80~120 km/h. And the comfort level is evaluated. The results show that when the B-type train passes through the station at 80~120 km/h, the vertical and lateral vibration acceleration of the train and the ride comfort of the train all meet the limit requirements of the specifications. The vertical response of track-bearing floor is greater than the lateral response, and the vertical displacement and vertical acceleration are little with the speed change. The lateral displacement and lateral acceleration increase first and then decrease with the speed increase. The maximum vertical response of the station hall floor is greater than its horizontal response, the maximum lateral displacement increases first and then decreases with the increase of vehicle speed, and the maximum horizontal and vertical accelerations increase with the speed increase. By comparing the theoretical calculation result with the field measured data of "bridge and construction integration, the reliability of finite element simulation of spatially coupled vibration is verified, which can provide a reference for the calculation and analysis of similar elevated station structures.