Studies Of Pounding On Seismic Responses Of Simple-supported Bridges Under Longitudinal Earthquake

City bridge is hub of urban traffic network engineering, the construction cost is high,once encounter earthquake damage, not only causes serious traffic paralysis and hugeeconomic losses, and the extremely difficult post-quake restoration and the cost is big,therefore, earthquake disaster prevention of urban Bridges are more attention from theacademia and engineering. The past few decades are the rapid development of decades, whichwitnessed bridges damage accident as lifeline engineering under earthquake. Bridge structureitself has its drawbacks. This problem may not come out in the general case, but it can dodamage to pier and cause girder falling under the strong earthquake, especially the upper partof the bridge structures due to the adjacent beam or caused by collisions between adjacentcoupling end of beam. So it is necessary for bridge structure analysis of collision effect.This paper takes south hill road of T605main southern part2(20+20+20) of threespan simply supported girder bridge as the engineering background and uses for referencefrom the relevant specification and relevant experience in the process of bridge construction.Kelvin contact element model is adopted in this paper. The whole bridge finite element modelof bridge is set up. The collision effect response of the bridge longitudinal beam and theinfluence of bearing characteristics affect collision effect and response of the whole bridge isanalyzed. The main contents of this paper are as follows:(1) Bridge collision which is caused by earthquake is introduced which leads to thenecessity of this topic research. Then it expounds the beam bridge collision problem of theresearch background and research status.(2) In this paper, the bridge and the calculation of the collision response theory areillustrated, focusing on the existing collision cell analysis model. And then analysis model isadopted in this paper.(3) According to the actual situation of this paper, the structural part model is introducedand the whole bridge finite element analysis model is established.(4) The whole bridge finite element model including contact unit and support unit isestablished. The vibration of the main features of the model is drawn. In view of the relatedinfluence factors of contact element, such as the contact element stiffness, damping, initialclearance and pier height ratio parameters of the comparison are analyzed.(5) The effects of changes on the bearing characteristics of bridge collision and responseof the bridge bearing parameters were analyzed.