Study On Key Technology Of Construction Control Of Concrete Filled Steel Tube Arch Bridge

Concrete-filled steel tubular special-shaped tied arch bridge is not only unique in shape, beautiful and generous, but also light in self weight, high in stiffness, with better economy in urban bridge construction gradually favored. As the arch axis is skew curve, the arch rib is more complex in the construction process, so the construction of this type of bridge needs to be monitored scientifically and reasonably, and the influence of different control parameters on the structural stress should be considered to ensure the structural construction safety and construction accuracy. In this paper, the construction monitoring, construction optimization and parameter analysis of Beidahe concrete-filled steel tubular special tied arch bridge in Jiuquan City are carried out. The results show that the stress curve changes in “s” shape when the temperature increases as a whole, and the lower chord steel tube is first tensioned, then compressed and finally tensioned. The stress (tensile stress and compressive stress) of steel tube and concrete will increase with the increase of arch rib concrete capacity, and the stress will decrease with the decrease of capacity. Compared with the stress of steel tube, the change of concrete stress is smaller.