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Study of Vehicle-Induced Longitudinal Vibration and Connection Between Pylon and Girder of Long Span Railway Cable-Stayed Bridge
Pages: 12-19
Year: Issue:  2
Journal: Bridge Construction

Keyword:  railway bridgecable-stayed bridgemain girderlongitudinal dynamic behaviorvehicle-bridge coupling vibrationlongitudinal stiffnessdynamic frictional resistancefinite element method;
Abstract: The vehicles moving on the long span cable-stayed bridge will cause longitudinal movement of the bridge.To study the longitudinal movement amount and longitudinal force behavior of the main girder of the long span railway cable-stayed bridge and the influence of connection stiffness of the pylon and girder under the action of train load,the Hanjiatuo Changjiang River Bridge was cited as an example,the longitudinal displacement and velocity responses of the main girder were calculated,using the vehicle-bridge coupling vibration analysis method and the basis for optimizing the design parameters of the longitudinal dampers was provided.The longitudinal interaction forces between the pylon and girder were analyzed and the upper limit values of frictional coefficients of the bearings were given.The relationship between the system longitudinal total stiffness and elastic connection stiffness was calculated and the relationship among the elastic connection stiffness,longitudinal total stiffness and longitudinal displacement of the main girder was made clear.The results of the study demonstrate that the influence of the CRH2Train Group on the longitudinal dynamic responses of the bridge structure is more significant.The increase of the fictional resistance of the bearings can offset the longitudinal action force of the structural system caused by the moving trains,hence,can suppress the longitudinal movement of the main girder.The system longitudinal total stiffness increases with the increase of the elastic connection stiffness of the pylon and girder,but the nonlinear relationship is significant.
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