Study On Anti-Seismic Response Of Composite Ribbed Deck Arch Bridge Formed By Steel And Concrete

Arch bridge is a common structure that has been widely built in our nation (especially in the southeast region).In recent years,more and more bridge operators are attention to research how to strengthen the anti-seismic ability of arch bridge,because a large number of arch bridges locate earthquake-prone areas and its anti-seismic ability is poor.The seismic response and the structure ductility anti-seismic problem of the composite ribbed arch bridge formed by steel and concrete deck arch bridge,which is firstly put forward by Professor Zhou Zhixiang of Chongqing Jiaotong University,is researched,and with the ordinary reinforced concrete arch bridge for contract analysis.The main studies are as follows:1.The study on structure system and construction scheme of a composite ribbed arch bridge formed by rotating columns down verticallyThis article takes the Wansheng Zaodu Bridge as an example,elaborating in detail the structure system of the composite ribbed arch bridge formed by steel and concrete rotating columns down vertically,its various key parts of the structure and the construction scheme.In allusion to different geographical environment,the rotating columns down vertically construction methods are discussed to provide the helpful reference to construction scheme of this kind of arch bridge.Finally this paper analyzes and compares the characteristic and applicable scope of between the composite ribbed arch bridge formed rotating columns down vertically with the general concrete rib arch bridge.2.The vibration characteristic analysis of the deck type composite ribbed arch bridge formed by steel and concreteTake the limited unit methods of the arch bridge fundamental oscillation theory and vibration analysis as the rationale,combined with Wansheng Zaodu Bridge,analyses the vibration characteristic of the composite ribbed arch bridge formed by steel and concrete and obtain this kind of bridge to be different with other the general concrete rib arch bridge's characteristic of self oscillation characteristic.According to the Wansheng Zaodu Bridge's load experimental data and the analytic methods in sxistence,the vibration characteristic of the composite ribbed arch bridge formed by steel and concrete is reflected exactly.3.The earthquake response characteristic analysis of the deck type-composite ribbed arch bridge formed by steel and concrete.Establish the FEM of the entire bridge through MIDAS,take the power time history analytic method to analyze the Wnsheng Zaodu Bridge's response characteristic under all levels of earthquake function.The article proposes this kind of bridge needs to pay attention specially the spot and the partial component through the structure stress and the distortion under all levels of earthquake function.4.The research of ductility anti-seismic analysis of composite ribbed arch bridge formed by steel and concrete.Embark from the earthquake to bridge structure's failure mechanism to emphasize the importance of the ductility anti-seismic project.It is proved that the composite ribbed arch bridge formed by steel and concrete is better than the conventional SRC arch bridge through the ANSYS contrastively analyzes their componential ductility under load function.