Under The Cfst Arch Space Stability And Ultimate Bearing Capacity Research

Because of its unique merit, concrete filled steel tube (CFST) arch bridge is widely used. Along with span increasing and the load of the arch rib increasing, the kind of bridge appears the outstanding problem of its stability and supporting capacity during the construction stage and operation stage. So the research of the stability and supporting capacity of CFST Arch Bridge has great engineering value and theory significance.In this paper, the research results of domestic and overseas scholars on stability and supporting capacity of CFST Arch Bridge are roundly summarized and the theory of FEM(finite element method) to analyze the stability and supporting capacity of Concrete-Filled Steel-Tube Arch Bridge are introduced in detail. This article takes CFST arch bridge as the project background in city, uses ANSYS as the tool and analyzes stability and supporting capacity during the construction of the steel tube-confined concrete and five kinds of the operation stage in three ways which are linear elastic stability analysis, geometrical nonlinear stability analysis and double nonlinear stability analysis. This paper also analyzes the influence to the stability and supporting capacity of Concrete-Filled Steel Tube Arch Bridge by some parameters such as: the ratio of the arch height and span, the link of the arch rib and the excursion of the arch axes. Find out the stability and supporting capacity change rule by this physics and geometry characteristic target. It is very importance to help design and build this kind of bridge.In addition to, in this paper, the out-of-plane stability of the Bridge, which is along-span concrete filled steel-tube arch bridge, is analyzed by linear elastic analysis and geometrical nonlinear analysis. The analysis shows that the stability factor of linear elastic analysis is approximately equal to the stability factor of geometrical nonlinear analysis .It is also revealed that the stability factor decreases little with respect to various horizontal loads. The analysis result shows that the stability factor of the bridge deceased significantly when the nonlinear behavior of material is considered.