Analysis of Train-Turnout-Bridge Spatial Vibration with Train Running in the Divergent Direction

In this paper a rail-turnout tie-bridge spring-damping vibration model is built by using finite element method. The train-turnout-bridge spatial vibration equation sets are formulated by using the principle of total potential energy with stationary value in elastic system dynamics and the "set-in-right-position" rule for formulating matrices. Taking Tianluo major bridge in Wenzhou-Fuzhou railway line for passenger as an example, it is assured that there was a crossover combined with two No.38 turnouts on the bridge. The train-turnout-bridge spatial vibration dynamic responses are analyzed when "China Star" high speed train with 1 locomotive and 4 passenger cars at the speed of 120km/h runs through turnout in the divergent direction. The results are compared with those of train through turnout on roadbed. The calculation results show that bridge leads the displacement of rail and turnout tie increase very much, the dynamic responses of train increase a little, and it has little effect to the acceleration of turnout. The lateral vibration responses of bridge are equal to those of bridge with train through turnout main at the speed of 150km/h.