Structural Characteristic Study On Skewback Of Through Concrete Filled Steel Tube Tied-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. Therefore, CFST arch bridge has gained a booming opportunity in our country and meanwhile a large number of arch bridges have been constructed in our country. With wonderful architectural styles, through and half through arch bridges, are commonly favored in urban bridge design and construction so as to be the symbol of civic constructions. For the moment, they are still advancing on wider span and larger scale and their application region and scope are enlarged continually.In this dissertation, the Nan-pu-hong Bridge in Ezhou city, Hubei province, a rigid-framed through CFST tied-arch bridge is discretized by the FEM according to its structural characteristics with the spatial beam element simulating the end floor beams, middle floor beams, arch ribs and the like and with the spatial link element simulating the suspenders and horizontal tie bars to erect the bridge's spatial mechanical computational finite element model; and the spatial mechanical computational finite element mode of the bridge's skewback is erected with the spatial solid element.Finite element common software ANSYS is applied for its spatial mechanical calculation and first Compared with the construction's practical value, the bridge's finite element model proved to be true. The structural behaviors of this bridge's skewback's section is analyzed under different loads of all construction stages and entire bridge stage and influence of different tie bars' tensile force and wind load on the structural behaviors of this bridge's skewback is also calculated, so as to acquire all of photos of arch rib's bending moment and axile force. Finally, the skewback's inner force is analyzed under typical Conditions based on Saint-Venant Principle and advance some conclusions and suggestions.The calculating results can offer the related technical parameters and basic data for the design certification, construction, health detection and maintenance in this kind bridge's working conditions.