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高墩刚构-连续组合体系梁桥合龙施工阶段的结构内力变化会因合龙次序不同而有所不同,而且由于高墩刚构-连续组合体系梁桥过渡墩一般较高(≥30m),边跨现浇段一般采用吊架或托架施工,这与传统的落地支架施工现浇段在结构内力变化上也有差异。文中针对高墩刚构-连续组合梁桥的桥型特点,阐述了不同合龙次序下产生次内力的影响因素,比较分析了湖南永州市东路高架桥这一高墩刚构-连续组合梁桥在不同合龙次序下的应力、挠度情况。结果表明,采用不同的合龙次序虽然都是可行的,但应结合桥梁的结构受力特点及现场施工情况确定该类桥型的最佳合龙次序,这样才能在确保桥梁施工质量和安全的前提下提高施工效率。
The structural internal force changes during the construction period of the high-pier rigid-continuous composite beam bridge depends on the closing sequence. Moreover, because of the high pier (≥30m) of the bridge with high pier rigid-continuous composite bridge, Cast-in-place cross-section generally use hanger or bracket construction, which is different from the traditional internal floor bracket cast-in-situ structural changes in the structure. In this paper, according to the characteristics of bridge type of high pier rigid-continuous composite girder bridges, the influencing factors of sub-internal forces under different closing sequences are expounded. The viaduct rigid-continuous composite girder bridges Different closure order of stress, deflection conditions. The results show that although all the different closing sequences are feasible, the best closing order of such bridges should be determined according to the mechanical characteristics of the bridge and the on-site construction so as to ensure the construction quality and safety of the bridge Improve construction efficiency.