Experiment Study on Dynamic Responses of Bridge and Surrounding Environment Induced by High-speed Trains

To understand the dynamic responses of bridges and surrounding environment induced by high-speed train, and thus to serve the rapidly developed high-speed railway engineering of China better, the field dynamic responses of bridges and surrounding environment caused by high-speed train on Wuhan-Guangzhou Passenger Special Line were measured, and the vibration acceleration of bridge, and wheel unloading rate, derailment coefficient, lateral wheelset force, and riding comfort of train, and environment vibrations near railway line were investigated. it can be found that vertical vibration acceleration of bridge generally ranges from 0.07 m/s
²
to 0.25 m/s
²
, and the derailment coefficient, wheel unloading rate, lateral wheelset force of train differs from each other when the train is moving into bridge, on bridge, and out of bridge, and the horizontal and vertical comfort indexes of train are both less than 2.5. Furthermore, the vertical vibration levels of ground 30m away from the centerline of railway track are respectively 56-72dB and 60-72dB for bridge and subgrade zones, and with the increasing of the train speed, the ground vibration grows gradually, and when the train speed increases by 150km/h, the vibration level increases by about 10dB. It can be concluded that the dynamic responses of bridge and the surrounding environment induced by moving high-speed train of Wuhan-Guangzhou Passenger Special Line meet the standard requests, and can be used in other projects.