Analysis of interaction between continuously welded rail track and bridge on S-shaped curve line with small radius for trams
This study aimed to investigate the influence law of interaction between continuously welded rail track and bridge on S-shaped curve line with small radius for trams.A continuously welded rail track and bridge on S-shaped curve line with small radius for trams in Guangzhou as an engineering background,a finite element model was established to study the influence of factors such as the bridge temperature,longitudinal resistance of fasteners,the rail expansion regulator,the lateral stiffness of fasteners and the lateral oscillation force of tram on the interaction between rail and bridge.Based on the indicators such as the additional expansion force of rails,the longitudinal rail displacement,the longitudinal relative displacement between bridge and rail,and the transverse force of bridge pier supports,this study explored the interaction characteristics between continuously welded rail track and bridge on S-shaped curve line with small radius under different working conditions,and proposes the optimization plans to reduce the interaction between rail and bridge.The results indicate that overall temperature change of the bridge has a significant effect on the additional expansion force of rail,as well as the longitudinal relative displacement between bridge and rail.Furthermore,the additional expansion force of rail,the longitudinal relative displacement between bridge and rail,and the transverse displacement of rail reach their maximum values at the junction of the S-shaped curve on the continuous beam bridge.The use of small resistance fasteners on continuous beam bridges is beneficial for reducing the additional expansion force of rail and longitudinal displacement of rail.The installation of rail expansion regulator can reduce the additional force of rail on the S-shaped small radius continuous beam bridge,but it would significantly increase the longitudinal displacement of rail.It is recommended that no or less the rail expansion regulator be installed on the S-shaped small radius continuous beam bridges.The lateral stiffness of fastener has a significant effect on the transverse displacement of rail,while its effect on the lateral force of bridge pier support can be ignored.The influence of the position where the lateral oscillation force of tram is applied on the lateral displacement of rail and the lateral force of the bridge pier support can be ignored.The results provide the theoretical basis for the design of continuously welded rail track on curved continuous beam bridges for trams.
tramsS-shaped curve line with small radiuscontinuous beam bridgecontinuously welded railbridge-rail interactionnumerical simulation
万方数据
维普
