Abstract:In order to obtain the influence rule of asymmetric pouring of concrete in arch rib steel tube on structural safety, the deformation, stress and stability of the structure during the asymmetric jacking pouring of concrete in arch rib steel tube of Nanpuxi Bridge are analyzed by finite element method. The calculation results show that in the process of asymmetric pouring, the deflection of arch rib on the first pouring side is large, and the deflection difference of arch rib on both sides decreases gradually with the increase of the number of arch ribs completed pouring. After pouring, the vertical deflection of arch rib at the symmetrical position of cross section is symmetrical. The stress of arch rib is greater than that of transverse brace in the whole construction stage, especially in the first concrete pouring process, which should be paid more attention to. When the first pouring concrete is completed, the stability safety factor of the structure is the lowest. As the concrete is gradually completed, the stability safety factor of the structure gradually increases. The initial geometric defects of the structure are unfavorable to the stability of the structure. The stability coefficient considering the initial geometric defects of the structure should be used to evaluate the safety of the structure.