The Analysis On The Mechanics Behaviors Of Long-Span Rigid Frame Bridge With Super High-Pier

With the rapid development of highway transportation system in our country, bridge construction has come in the unprecedented developing period. Especially in the recent years, with the rapid development of highway traffic enterprise in China of western area, a number of long-spanned rigid-framed bridges with high-piers are widely used for their terrain adaptability, and the piers are higher and higher. Because the force of long-spanned rigid-framed bridges with high-piers is very complex and the construction state is changeful, in order to ensure the bridge security and the line type, the stress can accord with design, the deformation, force, and stability of high-pier has to be analysed. On the basis of above analysis, combine with theory and project example, the contents is as follows:Firstly, the configuration form of long-spanned rigid-framed bridges with high-piers is analyzed in the thesis, the configuration form of high-pier is importantly researched, and the different mechanics behaviors are compared. In the thesis, the structure design technique of super high-pier is discussed.Secondly, the basic element of finite element method, especially the bridge static analysis of finite element method is expatiated, and the finite element method software for bridge static analysis is researched. By utilizing the finite element program MIDAS/Civil, construction static analysis of two long-spanned rigid-framed bridges with different high-piers configuration form is performed, and the static actions of high-pier, girder and base with different construction state and different pier height are compared.Finally, the thesis researches the stability of long-spanned rigid-framed bridges with high-piers, summarizes the investigation development on stability of bridge, compares the difference of the two stability theory and discusses the methods of stability analysis of bridge. In the thesis, combined La Ba Jin Great Bridge, the bridge construction stability is concretely analyzed, and the influencing factors of long-spanned rigid-framed bridges with high-piers stability, such as construction state, pier height, thickness of the pier wall and amount of horizontal plank are studied, some useful results are derived.