Construction Process Analysis Of Fly-bird-type CFST Arch Bridge And Construction Control

In recent years, CFST arch bridge has been developed unprecedentedly in China, for its beautiful appearance and unique structural properties; Because of their light weight, high strength, load capacity, strong ability of resistance to deformation, which can be perfectly meet the requirements of bridges construction on saving materials, easy installation, light weight, carrying capacity, and many other requirements, CFST arch bridge is an ideal structure for long span arch bridge.In the construction process of CFST arch bridge, structural deformation is large and rib alignment is very important for arch bridge, in order to guarantee rib alignment and stress meet the demands finally, the CFST arch bridge must be controlled in its construction process.Based on the background of Gao-Yang bridge which has been built in Hubei province, CFST arch bridge construction and control technology in various related issues has been studied including the construction process of CFST arch bridge, the simulation analysis of construction process, structural deformation monitor and stress control in the construction process. Main contents are as follows:(1) Construction craft of the Gao-Yang bridge has been introduced, arch foot problems appeared in the process of Gao-Yang bridge and the solution has been analyzed and calculated, this solution has been shown to be feasible in the construction process of Gao-Yang bridge.(2) Combined with the specific construction process of Gao-Yang bridge, using the finite element software to model the construction process. first, the mobile cable cranes of Gao-Yang bridge has been modeled, the pre-bias value of the tower has been calculated, and the accuracy of pre-bias values has been verified correctly in the actual operation; second, through the tube concrete stress analysis of various construction stages of Gao-Yang bridge, the maximum stress location for the construction monitoring has been predicted which provide a theoretical basis and theoretical guidance; finally, through the stability analysis of all the construction process of Gao-Yang Bridge, the construction status and construction processes of Gao-Yang Bridge has been validated more reasonable to meet the requirements of the actual construction; the cable force and pre-rigged has been calculated which based on the unknown load factor invariable cable method, it has been proven to meet the requirements of acceptance of norms, and more convenient, no repeated adjusting cable, reduce risks and speed up the construction progress.(3) The construction monitoring content and the result has been listed; the errors factors of CFST arch bridge caused by construction monitoring process has been elaborated, and presented for the corresponding countermeasures about these errors.