Dynamic Characteristics And Stability Analysis Of Cfst Arch Bridge

The application of concrete-filled steel tube (CFST) structures to bridges has solved the problem of the development of the high-strength material of the arch bridge and the problem of the non-bracket construction and the lightweight arch beam. Therefore, the development of the arch bridge is infused with fresh vitality. In recent ten years, CFST arch bridge has gained a booming opportunity in our country, but there has no one code for design and construction of CFST arch bridge in our country and the study on dynamic performance of the structure gets relatively behind the study on static feature of the structures. Taking the two examples of CFST arch bridges, by establishing 3-D finite element model of them with the software ANSYS and analyzing their dynamic character and stabilization, some useful conclusions are get.The followings are the main work of the thesis.(1) The purpose of briefly introduction of the establishment course and the theory of solution of the dynamic finite element equation of the bridge is based our following analysis and comparison on.(2) Taking the example of the Yellow River main bridge in Zhengzhou section of Jingzhu freeway, firstly, natural vibration feature and the effects of the structure construction on natural vibration feature are analysed. The structure construction includes three factors here and three factors are wale disposal, structures of carrying over force and suspender modality. Second, the varieties of natural vibration feature under different simulated structure damages conditions are analysed. The main purpose of the work is carrying through damage identification in the future. Third, the time history responses of the structure under different load at different speed are analysed, and the time history responses include displacement and velocity of the given nodes. At last,...