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Environmental vibration measurement and analysis of U-girder coupling vibration of new vehicle-bridge

WANG Binli1,PU Qianhui1,BAI Guangliang1,2(1.School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;2.State Key Laboratory of Bridge Structural,Dynamics,Key Laboratory of Bridge Earthquake Resistance Technology,Chongqing 400067,China)  
This paper purposes exploring the influence of dynamic responses of U-girder in vehicle-bridge system for urban rail transit on the surrounding environment.In order to study the influence,a rail vehicle dynamic model with 31 DOFs(degrees of freedom) is made by employing the linear rail model.A standard span of 30m single line U-shaped structure,which is in the elevated section of Chongqing City Metro Line Project in the west of Liang hill,is taken as the study object.The analysis of coupling vibration in vehicle-bridge system is performed by using a self-compiled program and compared with field test results to confirm the correctness of the dynamic model and the self-compiled program.Through the calculation and the analysis of measurement results,the environmental vibration induced by U-girder is evaluated.The results show that U-girder has remarkable effect on the environmental vibration control.
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