Research on pounding effect induced by earthquake for high-speed railway simply supported bridge subjected to train braking force
YANG Meng-gang1, PAN Zeng-guang1,2
1. School of Civil Engineering, Central South University, Changsha Hunan 410075, China2. Changsha Meixi Lake Industrial Co., Ltd, Changsha Hunan 410205, China
Abstract：Taking a high-speed railway 3-span simply supported bridge as background engineering, the collision finite element model of it is established with the ANSYS software. In this model, the foundation deformation and the nonlinearity of bearings are considered, and the Kelvin model is used to model the collision between the adjacent beams. The train braking force model is obtained by the code and existing testing results. Finally, the pounding effect subject to the EL-Centro wave is analyzed, and the influence on pounding effect subjected to the high-speed train braking force is discussed. The results show that the train braking force makes the shearing force at the bottom of the pier larger, increases the space between the adjacent beams, enlarges the maximum impact force and the collision frequency, and aggravates the destruction of the restrained supports. The influence degree is related to the direction between train braking force and seismic load, and the stiffness of the piers. Therefore, the pounding effect under the combination action of train braking force and seismic load is very necessary to be investigated for the seismic design of the high-speed railway simply supported bridge.
2014, Vol. 33 
