Ambient vibration induced by spatial coupled vibration of vehicle-track-bridge system and isolating measures

In this paper, vibration induced by spatial coupled vibration of vehicle-track-bridge system of urban rail transportation is transferred to the basement of buildings by ambient soil, it causes the vibration of the buildings. Aiming at this problem, a model for spatial coupled vibration of vehicle track-bridge system is established firstly, the reactions at bottom of bridge piers are obtained by random vibration analysis. Then a three-dimension finite element model of soil-building system is established, the vibration of ambient soil and surrounding building are numerically analyzed. At last vibration isolation trench is added to the model, the effect of vibration isolation is analyzed. Through numerical analysis, it shows that the effect of vibration isolation is obvious.