Study Of Calculation Method And The Influence To Mechanical Behavior Of Fabrication Profile Of Long-span CFST Arch Bridge

With the development of China’s roads and transportation construction, the application of concrete filled steel tubular arch bridge has got a great development.The increasing span and segments of CFST make the calculation of fabrication profile more difficult; what’s more, the calculation result of fabrication profile plays an important role on the prefabrication of steel tubular arch in the factory and the on-site construction. So, a reach on the calculation methods of fabrication profile of long-span CFST arch bridge and its influence to the bridge ’ s mechanical behavior is very significant. And, this paper made the following researches:Firstly, the author made an introduction on the domestic research status of the CFST arch bridge’s fabrication profile, the shrinkage and creep of concrete in the tube, and the geometrical non-linearity’s influence to the steel arch tube’ deformation and mechanical behavior.Secondly, the author introduced the theory of the finite element method of CFST,discussed the basic assumption of the finite element method, how to calculate the shrinkage and creep of concrete with the finite element method, and the fundamentals of geometrical non-linearity analysis.Thirdly, the author introduced the reason of the fabrication pre-camber setting and the factors to consider and the method of setting, at the same time, analyzed the theory and the geometrical relationship of zero initial displacement method and tangential displacement method when setting. Making the Zong Xi river bridge as the background material, and using Midas civil to simulate the whole construction process, the author calculated the displacement of the main steel arch in each construction stage, analyzed by what the deformation of steel tubular arch will be influenced, such as the weight of the main arch structure, the shrinkage and creep of concrete in the tube, geometrical non-linearity and the truck-load. And then, has the fabrication profile calculation result of the Zong Xi river bridge.Finally, the author analyzed different mechanical behavior and stress of the main steel tubular arch with different fabrication profile, the influence of the arch axis deviation to the mechanical behavior of a completed bridge, how geometrical non-linearity influenced thedeformation and stress of the main steel arch. The author analyzed how horizontal displacement and bias of profile influenced the deformation and stress of the main steel arch and got the reference conclusion.This research on the calculation methods of fabrication profile of long-span CFST arch bridge and its influence to the bridge’s mechanical behavior has certain practical significance and reference value.