Analysis Of Bridge Collapse Accidents Based On Field Debris And Finite Element Method

With China's rapid economic and social development,bridge constructor plays more and more pivot role in the road network construction and civil engineering.However,the accidents of bridge collapse happening frequently in recent years cause huge economic losses and casualties,which successfully attracts people's attention.Therefore,in order to figure out the reason of bridge collapse,people begin to summarize the collapse patterns.They want to explore an available method to analyze the bridge collapse,so the mechanisms and internal rules of bridge collapse can be detected.The main work outcomes are proposed as following:Firstly,taking the accidents of bridge collapse happening at home and abroad as background,the thesis reviews the development process of bridge collapse about the arch bridge and the girder-type bridge.Both the domestic and foreign research shows that it is difficult to simulate the process of bridge collapse.Because it will be not convergence to consider the collision damage,concrete spalling and beam falling during the numerical simulation,which also is related to element type and size.Secondly,combining the information collected from the spot,the study does analyze the bridge state at the bridge collapse moment by MIDAS and ABAQUS software.According to the systematic analyses,the trigger of bridge collapse can be drawn here.Due to the asymmetric demolition,the piers of the Taihe Bridge lose their stability and destruct.Finally,based on the field debris information and finite element model,the collapse process of Yuegan Bridge is simulated on ABAQUS.It reveals that the whole superstructure of Yuegan Bridge rotate from the piers under the eccentric load.The main work results show that,it is an effective way to analyze the process of bridge collapse combing the field debris information and finite element model.And it can provide technology guarantee for the bridge accident research.