Ultimate Bearing Capacity Analysis Of Long-Span Stone Arch Bridge With Arched Spandrel Structure

The construction technology of ancient and contemporary stone arch bridges of China is famous in the world, there are a lot of stone arch bridge have been constructed in our country, eighteen of them are longer than 100m, So it is important to study the capacity of the long span stone arch bridges. By analyzing the stability theory and calculating Dan He bridge, a practical tone arch bridge, we could find the failure features of long-span stone arch bridge with arched spandrel structure, which is the scientific basis for design and construction.This paper will present description and analysis from the following six aspects:1. First, this paper introduces the development of stone arch bridges in China and its mechanical performance and failure mechanism, gives a brief summary on development of analysis theory, design methods and calculation methods of ultimate-load capacity of stone arch bridges.2. Based on the stability theory of bridge structure and the ultimate bearing capacity analysis during the whole process of the structure, this paper points out that, researching the geometrical and material nonlinearity of structure is necessary for structural behavior of bridge structure.3. Paper introduces the analysis theory of geometrical nonlinearity of structure, and presents the deduction process, analytical method, differences and field of application of the U.L Formulation and T.L Formulation.4. Paper introduces the analysis theory of material nonlinearity of structure. And the chapter elaborates the material yield criterion, points out increment theory elastic plastic matrix and plastic matrix and the finite element method of elastic plastic problem.5. Paper introduces the resolution method of non-linear equation and convergence rule and the analysis theory of the program of ANSYS. Paper points out that the common resolution method of non-linear equation includes: direct solution, incremental method, New-Raphson method and mixed method. And, paper introduces the theoretic foundation and implementation method of nonlinearity of bridge structure in ANSYS.6. Final, according to the practice project, the ultimate bearing capacity of the 6 kinds load conditions, which were calculated by the finite element program, ANSYS. Through, when there are or are not spandrel structure, analyzing the result of material nonlinearity finds failure features and failure modes of long-span stone arch bridge structure.