Analysis Of Addition Longitudinal Force For CWR On High-speed Railway Bridge

The continuous welded railway mileage get longer and longer, because of the boom of high speed-railway. The CWR on high-speed railway can satisfy the requirement of smoothness, but the additional longitudinal force caused by the interaction of CWR and high-speed railway bridge acts an important load of high-speed railway bridge. A large longitudinal force may cause the buckling or breaking of the track, which threatens high-speed train safety. The interaction force between CWR and bridges is also one of controlling loads for the design of pier, abutment and the foundation of bridge. Thus it is necessary to analyze the additional force.The track, bridge and pier are interacted system on the continuous railway on the bridge, any change of them can influent the load of others. The track, bridge, pier and loads have very strong spatiality, so it is a good solution of building the whole bridge model containing with double bound railways in which the rail, bridge and pier can be considered together.The whole bridge model with double bound railways is built, the reference research achievements at home and abroad is summarized, the additional longitudinal force for the model is calculated and some laws and their reason is studied in the dissertation:(1) The mechanical model is established and verified with the finite element software ANSYS, considering the interaction between track and bridge. The parameters of the model are from Chinese High-speed Railway Codes and the European Codes.(2) As an example, the 5-span 32m double bound simple support girder of high-speed special passenger railway, the expansion and contraction forces, the flexibility force, the braking and acceleration forces, break forces between bridges and rails are calculated by the model. Also the longitudinal forces caused by different loads are analyzed.(3) The effect of the stiffness of the piers, longitudinal resistance and beam temperature on the interaction between the track and bridges is studied, and the change laws of additional longitudinal force are analyzed.