Analysis of the Influence of Bridge Stiffness Changes on the Vehicle-bridge Coupling Vibration of Single Tower Cable-stayed Bridge in High-speed Railway
Analysis of the Influence of Bridge Stiffness Changes on the Vehicle-bridge Coupling Vibration of Single Tower Cable-stayed Bridge in High-speed Railway
Taking the high-speed railway single tower cable-stayed bridge as the research object,a spatial multi-body dynamic analysis model of the train-track-bridge coupling system was established,and simulation analysis of the vehicle-track-bridge coupling vibration of the high-speed railway cable-stayed bridge was carried out.By adjusting the stiffness of bridge towers and main beams through changing the elastic modulus of materials,the influence of bridge stiffness changes on the vehicle-bridge coupling vibration was studied.The research results show that as the stiffness of the bridge tower increases,the vertical displacement response at the mid span of the main beam and the vertical displacement response at the top of the tower gradually decrease,with a peak reduction of 7.57％and 10％,respectively.As the stiffness of the main beam decreases,the peak vertical displacement at the mid span of the main beam and the vertical displacement at the top of the tower gradually increase.The change in stiffness of the main beam has a considerable impact on the vertical acceleration of the vehicle body and the Sperling vertical comfort index.Compared to changes in the stiffness of the bridge tower,changes in the stiffness of the main beam have a greater impact on the vibration response of the vehicle-bridge coupling system.Overall,the safety and stability of train operation meet the specification requirements.
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