清河站建桥合一结构的车致振动舒适度研究

清河站站房结构采用建桥合一的结构体系,列车高速通过时产生车致振动的舒适度问题需要重点研究。通过车辆—轨道模型得到列车对轨道的振动激励,将激励时程输入轨道—结构—环境土体模型,计算结构动力响应的研究方法,进行车致振动的舒适度评价,对清河站的研究得到:高铁列车在到发线进出站时,清河站候车层楼板最大预测Z振级满足规范要求;在正线高速通过时,候车层楼板最大预测Z振级超过规范限值,不满足要求,通过采取结构措施可达到舒适度要求。同时得出建桥合一结构体系在高铁列车通过时,正线位置的振动响应大于到发线,行车位置的响应大于其他位置,站台层的振动响应大于高架候车层和夹层的结论。

Research on Vehicle Induced Vibration Comfort of Bridge Integrated Structure in Qinghe Station

The station building structure of Qinghe Station adopts the integrated building/bridge structure system. The comfort degree of vehicle induced vibration when the train passes through at high speed needs to be studied. Through the vehicle-track model, the vibration excitation of the train to the track is obtained and then the time history of excitation is input into the track-structure-soil model to calculate the dynamic response of the structure, and the research method of calculating the dynamic response of the structure is used to evaluate the comfort degree of the vehicle induced vibration. The research results show that: when high-speed railway trains enter and leave the station, the predicted maximum Z vibration level of the waiting floor slab of Qinghe station meets the specification requirements; when trains pass the main line at high speed, the predicted maximum Z vibration level of the waiting floor slab exceeds the specification limit and fails to meet the requirements; and the comfort requirements can be satisfied by means of structural measures. Meanwhile, it is concluded that the vibration response of the main line position is greater than that of the arrival departure track, the response of the driving position is greater than that of other positions, and the vibration response of the platform layer is greater than that of the elevated waiting layer and the mezzanine when high-speed trains pass the integrated building/bridge structure system.