Study on the Vertical Stiffness of Bridge Expansion Joints Based on the Vehicle-Track-Bridge Coupled Model

Bridge expansion joints (BEJs) are equipped at the girder end of long-span railway bridges to ensure reliable transition track. BEJs should have suitable dynamic stiffness running safety and stability vehicle. To explore influence vertical on response vehicle, track, bridge, a three-dimensional vehicle-track-bridge coupled model is established, sleeper spacing vehicle speed taken into consideration. Taking high-speed line in China as case study, whole system calculated. The results show that (1) affected by spacing. With increase spacing, increases; (2) will affect interaction between wheel rail: displacement movable exceed limit if pressure-bearing insufficient, unloading rate may cushion plate insufficient. Based results, larger recommended. These been applied design studied line, which good service condition present.