大跨钢桁梁桥加劲柔性拱施工阶段抗风性能

Wind-resistant behavior of long-span steel truss bridge during construction of flexible arches

为研究大跨度钢桁梁柔性拱桥在柔性拱施工阶段的抗风性能,以世界最大跨度的该类桥梁——厦深铁路榕江特大桥为例,对柔性拱施工阶段的抗风性能进行系统分析,研究柔性拱合拢点位置对拱肋抗风性能的影响.基于分析结果开展不同抗风措施的比选和优化,并针对桥梁结构特征提出新型抗风措施.结果表明,柔性拱施工阶段的抗风问题突出,需要采取必要的抗风措施对结构进行临时抗风防护.本文提出的新型抗风措施(内部缆索法)效果明显,为类似工程的抗风设计提供参考.

To investigate the wind-resistant behavior of long-span steel truss bridge during construction of flexi- ble arches, taking the woad＇ s longest steel truss bridge with flexible arches as an example, the influence of closure position on the wind-resistant behavior has been studied, and based on the analysis results, different wind-resistant measures are proposed and compared, and an innovative measure is proposed according to the mechanical characteristics of this bridge. The results show that the protection against wind damage should be placed in a prominent position especially during the erection of the flexible arches. The innovative measure is effective, and provides reference to similar projects.