| The vibration of the bridge structure occurs under the load of the moving train,and the vibration of the bridge acts on the train,which forms the vehicle-bridge coupling vibration system.In order to meet the higher safety and comfort requirements of the society for high-speed railway,and to provide some reference value for the safety assessment and health monitoring of the existing bridge of the same type,it is necessary to study the vehicle-bridge coupling vibration system of long-span steel bridge under different train working conditions.This paper takes Shanghai-Suzhou-Nantong Tianshenggang Channel Bridge as the research object.The main work contents are as follows:(1)Based on the previous research results,the theory of vehicle-bridge coupling system was studied.The analytical solution and finite element solution of the same model are compared,and they are highly consistent.(2)The model of Tianshenggang Channel Bridge was established by using the large-scale finite element software ANSYS.Link10 element is used to simulate the derrick,and Beam189 element is used to simulate the truss,arch rib and coupling system.The difficulty in the modeling process is the establishment of orthotropic bridge decks.This paper simplifies the deck system.The bridge decks are segmented and combined with the U ribs,and then a virtual beam without weight is established to ensure the overall stiffness.(3)Using ANSYS software,the train model of moving constant force,moving mass,moving spring mass and multi-freedom is established.By coupling the four train models with the bridge model,it is found that the multi-degree-of-freedom train model can not only achieve the effect of imposing train load,but also analyze the dynamic response and running stability of the train itself.(4)A multi-degree-of-freedom train model is used to investigate the effects of different train types,speeds,groupings,routes and numbers on the coupled vibration system of the car and bridge,respectively. |
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