Study on the Lateral Vibration of the Steel Truss Bridge under the Different Vehicle Speeds

To study the lateral dynamic responses of a 64-meter steel truss bridge under train loads at different speeds, the structural model test was employed. The parameters of the bridge model, the rail model and the train model were determined by the similarity principle. The different speeds were applied on the train model to measure the lateral vibration signals at the designated positions of the bridge model. The results show that: when the train is passing the bridge at different speeds, torsional mode contributes a lot to the lateral displacements. The lateral displacements and accelerations of the bridge increase with the increasing train speeds and there are abnormal values at some speeds.