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混凝土开口薄壁箱拱桥一般采用薄壁拱圈的转体施工。为减轻转体的重量,转体前拱圈壁厚较薄,转体合拢后再增加壁厚。因此,转体时半跨转动体系处于脱离托架状态;合拢后二期混凝土浇注存在稳定性的问题,其中包括结构整体稳定和混凝土薄壁的局部稳定。针对此类结构建立了空间有限元模型,分析了上述2种情况。结果表明结构存在局部稳定问题,并提出了解决方法,其可为优化结构设计和安全施工提供参考依据。
Thin-walled concrete arch bridge opening the general use of thin-walled arch ring swivel construction. In order to reduce the weight of the swivel body, the wall thickness of the swivel front arch ring is relatively thin, and then the swivel body is closed to increase the wall thickness. Therefore, the half-span rotating system is in a state of being detached from the bracket when swiveling, and the stability of the second-stage concrete pouring after the closing has problems, including the overall structural stability and the local stability of the thin-walled concrete wall. For the structure of the establishment of a finite element model of space, analysis of the above two cases. The results show that the structure has the problem of local stability, and the solution is proposed, which can provide reference for the optimization of structural design and construction safety.