初始缺陷的大跨径钢管混凝土拱桥安全稳定性评估

初始缺陷的发生不仅会降低结构的承载能力,还会对后续的施工安全产生巨大的影响,不利于保证拱桥结构的整体稳定性。基于此,以某拱桥项目为实例,结合稳定性分析理论,通过空间有限元模型的建立,对成桥状态稳定性分析,由此总结出初始缺陷对钢管混凝土拱桥稳定性的影响,包括拱肋初始几何缺陷、拱肋内倾角、拱肋混凝土浇筑缺陷等内容,为正确评估大跨径钢管混凝土拱桥的稳定性提供参考。

Assessment on Safety Stability of Long-span Concrete-filled Steel Tube Arch Bridge with Initial Defect

The occurrence of an initial defect will not only reduce the bearing capacity of structure,but also have a huge influence on the follow-up construction safety and be not good to ensure the integrated safety of arch bridge structure.Based on this,taking an arch bridge project as an example,combined with the stability analysis theory and through the establishment of spatial finite element model,the stability of the finished bridge state is analyzed.Thus,the impact of initial defect on the stability of concrete-filled steel tube arch bridge is summarized including the initial geometric defect of arch rib,reverse camber of arch rib,concrete pouring defect of arch rib and contents,which provides the reference for correctly evaluating the stability of long-span concrete-filled steel tube arch bridge.