Research On Calculating Methods Of Concrete Filled Steel Tubular Arch Bridge

Arch bridge, with extremely high aesthetic value, acting as one of the fundamental bridge types and possessing a profound historical origin, is widely applied in engineering and is a popular bridge type in our nation's construction. As the application of CFST (Concrete Filled Steel Tube) structures to bridges has solved the problem of the application of high-strength material of arch bridge and the problem of the construction of arch bridge, two main bridge puzzles, arch bridge becomes much lighter and has stronger expressive force and the development of arch bridge is infused with fresh vitality. But now, the design and construction of CFST arch bridge can only be based on the CFST specifications in the construction industry with the combination of relevant clauses in the bridge design codes which bring about certain difficulties to the practical application of this sort of bridge for the lack of special design codes and construction codes.In this dissertation, the Fenghuangshan bridge, a through CFST arch bridge is discretized by the FEM according to its structural characteristics with the spatial beam element simulating the horizontal tied beams, end floor beams, middle floor beams, arch ribs and the like and with the spatial link element simulating the suspenders to erect the bridge's spatial mechanical computational finite element model. Finite element common software SAP2000 is applied for its spatial mechanical calculation and mechanical properties in various cases are obtained. The main fruit in the dissertation below:First ,basing on the achievements of the former exports, this article elaborats the relations of the steel pipe and the core concrete .Because of synergy of the two materials,the structure remedies their defects respectively and excellently improves its ductility and plasticity. With many unique advantages, the structure is widely applied to the constructional engineering.Second, At present ,for the lack of special design codes and construction codes,the elastic modulus of the CFST are not definite. And now we have to used three other codes,so these three methods that calculate the elastic modulus are various, and the results are different. Based on the comparison of the three methods,this article thinks at present we should use (CECS 28: 90) to compute the rigidity. If the concrete construction quality can obtain the guarantee, we also can use the (DL5099-97).Finally, This article unified the project to establish the spatial mechanics model...