关键词: 桥梁工程, 下承式钢箱系杆拱, 差值迭代法, 正装迭代法 , 施工索力, 对比分析研究

Abstract: The inner part of bottom-through steel box tied arch bridge belongs to complex high-order statically indeterminate space structure. In order to determine the suspender tension force more quickly and accurately during the construction of tied arch bridge, the finite element method was used to simulate the tensioning process of the whole suspender. The difference iteration method and the forward iteration method were used to calculate the reasonable construction cable force respectively. The structure internal force and deformation difference of the tie rod and arch rib in the construction process and the bridge state were compared and analyzed, and the applicability of these two methods was discussed. The research results indicate that the difference iteration method is simpler than the forward iteration method in calculation, and the construction cable force is uniform. The internal force and deformation of the whole structure are better than the forward iteration method. It can provide practical reference value for the optimization of the construction cable force of similar bridges.

Key words: bridge engineering, bottom-through steel box tied arch, difference iteration method, forward iteration method, construction cable force, comparative and analytic research