Analysis on Operation Safety of Express Freight Trains in Subgrade-Bridge Transition in Crosswind Environment

Nowadays, the express freight trains develop rapidly, and their load capacity is large and the running speed is high. Due to the bad aerodynamic performance of the car body, operational safety accidents are prone to occur under strong crosswind environments. At present, there is less analysis on the operation safety of express freight trains entering the subgrade-bridge transition under the crosswind. This paper establishes the dynamic model of the express freight trains entering the bridge-subgrade transition under the crosswind environment, and analyzes the influence rule of the crosswind speed, the operating speed of the train, the variation of the stiffness of the subgrade-bridge transition, and the bending deformation of the rail caused by the post-construction settlement of the road and bridge structure. The results show that under the crosswind environment, the vertical force of the wheel and rail increases obviously when the train enters the bridge-subgrade transition. The crosswind speed and the deformation of the rail caused by the cross the post-construction settlement of the bridge structure is the main factor affecting the operation safety of the train.