关键词: 桥梁工程, 无应力状态法, 拱桥, 施工控制, 索力计算

Abstract: In order to realize the reasonable bridge state that the stress state of the arch rib of the long-span arch bridge will be the same as the design after the construction of the bridge, the specific implementation of the stress-free state method was discussed, taking the long-span arch bridge with cable hoisting, the cantilever casting, the rotation construction and etc. as the research object. The cable force calculation formula was derived, and the control conditions for the displacement and curvature constraint of the arch rib during the adjustment process were proposed. The stress-free state method was applied to the construction calculation of the 500 m concrete filled steel tube arch bridge and the 200 m cantilever casting arch bridge. The calculation results show that the alignment and internal force of the arch rib after arch are consistent with the design condition.

Key words: bridge engineering, stress-free state method, arch bridge, construction control, cable force calculation