Ultimate Bearing Capacity Analysis Of Long-span Stone Arcade Bridge

Stone Arch Bridge is one kind of bridges commonly used in China.Expecially for highway bridges in mountain area,stone arch bridge,because of its comparatively better adaptation for the area's geographical and topographical conditions,is commonly given priority for its artistry and ecomonomization. In recent decades, there are many long span stone arch bridges have been constructed in our country, including a large number of multi-arch bridge.So it is important to study the mechanical performance and load-bearing capacity of the long-span stone arcade bridges.First, this thesis introduces the development of stone arch bridges and its mechanical performance and failure mechanism, the joint role of the construction on the arch and arcade function are introduced in the thesis, gives a brief summary on development of calculation methods of ultimate-load capacity of stone arch bridges.The thesis introduces the stability theory of bridge structure and the ultimate bearing capacity analysis during the whole process of the structure; The thesis introduces the analysis theory of geometrical and material nonlinearity of structure, and presents the deduction process, analytical method and field of application of the U.L Formulation and T.L Formulation; The thesis introduces the analysis theory of material nonlinearity of structure. Including the constitutive equation of voussoir stone,the material yield criterion and the increment theory elastic plastic matrix. The thesis introduces the resolution method of non-linear equation and convergence rule.Then, the thesis introduces the theoretic foundation and implementation method of geometrical and material nonlinearity of bridge structure in ANSYS.Final, according to the practice project, the ultimate bearing capacity of the 3 forms, which were calculated by the finite element program,ANSYS. Through, when there are or not spandrel structure and three-span arcade bridges,analyzing the result of the geometrical and material nonlinearity finds failure features of bridge structure.