Study On Influence Of Pier Differential Settlement On Train Operation Of High Speed Railway

Simple supported beam-bridge,as one of the main forms of bridge in high speed railway,has a lot of obvious advantages such as low cost,short cycle of construction,small impact on traffic.So it is used on a large scale.Differential settlement of bridge piers,as one of the major diseases is the main factor affecting track smoothness in the bridge diseases of high-speed railways,today.It is great significance to study the safety and comfort evaluation indicators of train operation and it could ensure the safe operation of high-speed railway trains on elevated bridges with the change of simple support beam settlement.In view of the above situation,the author used the 32 m simple beam in high speed train as research object to carry out the vehicle-bridge dynamic analysis.The author used ANSYS to establish the sub-model of the track-bridge superstructure numerical simulation,and used SIMPACK to establish the sub-model of the vehicle-orbit dynamic effect.The parameters of the state of high-speed railway traffic are calculated and analyzed,when the speed and pier settlement were changed.The changes of the safety and comfort of train operations were got,when the train speed and settlement increased.The experimental results showed that the change trend of train safety and comfort were basically the same with the increase of pier settlement at the same speed.But the degree of growth such as performance indexes of car body acceleration,wheel and rail load reduction rate.The high speed train can meet the requirements of safe and comfortable operation for the high speed railway construction of simple supported beam bridge.According to the composition of the bridge to the high-speed rail line project,in the period when the operating speed of the pier settlement is less than 10 mm,high speed trains can meet the safe and comfortable running requirements;with the speed increase,the linear change of beam as the main control factors,such as strengthening the monitoring and maintenance of rail line,high-speed rail line bridge.