Actual Measurement and Analysis of Station Vibration Induced by High-Speed Train

The station-bridge integrated building structure system is a commonly used building form in railway stations in the new era, which can effectively meet the zero passenger transfer requirement and ensure the reasonable flow of the crowd. The platform is a place for passengers to wait for and get on the train. During the waiting process, the high-speed train will definitely enter and leave the station. When the train passes through the station at high speed, it will cause vibration, which will make the passengers uneasy and make the structure itself produce fatigue vibration damage. For the station-bridge integrated building structure system of a high-speed railway platform, the non-passenger walking load excitation time period was selected and the CMG-5TCDE seismometer was used to measure the high-speed railway platform. The background and structural vibrations caused by various vehicle speeds, the effective values of vibration acceleration of different measuring points, and the intersection of two trains were analyzed. The following conclusions were obtained:The background vertical vibration acceleration level is only 53.21dB. When a 45km/h high-speed train passes through, the vertical vibration acceleration level increases to 74.00dB. Moreover, the passing of a high-speed train has a significant effect on platform vibration. The vertical vibration acceleration caused by the high-speed train passing through the platform is larger than the horizontal vibration acceleration, and the vibration acceleration increases with the increase in the train speed, but the increase rate gradually decreases with the increases in the train speed. The east-west and north-south directions have the same duration of vibration acceleration. However, the vertical vibration acceleration level is slightly different. Notably, a vibration rebound zone is observed during the propagation process of vibration. In this test, the vibration rebound zone is approximately at 14m, which is mainly caused by the reflection of vibration waves in different media. When two high-speed trains meet, the vibration acceleration will be extended and the amplitude will increase, which will affect the comfort of passengers and staff. The results of this study provide the gist for the simulation prediction of the station-bridge integrated building structure system of a high-speed railway station and comfort design of transportation hubs in the future. © 2020, Editorial Board of Journal of Tianjin University(Science and Technology). All right reserved.