大跨度钢管混凝土劲性骨架拱桥极限承载力分析

Ultimate Load Capacity Analysis of Long-Span Concrete-filled Steel Tube Stiffening-frame Arch Bridge

针对大跨度钢管混凝土劲性骨架拱桥在变形、失稳破坏期间产生的材料和几何非线性特性,对这种桥型的非线性分析理论和分析方法进行了研究,并以宜万线上某大桥为例,进行了静力荷载作用下的极限承载力分析;此外,对该桥的刚度问题、设计荷载下的应力控制区域等问题进行了研究。研究结果表明,钢管混凝土肋拱具有较好的弹塑性性能和较高的承载能力。

On the background of the nonlinear characteristics of material and geometric design during the period of deformation and instability for long-span concrete-filled steel tubular arch bridges. Analysis of the ultimate load capacity of a bridge in Yi-Wan Line under static loads is finished. Rigidity of the bridge and the stress controlling region under the design load are also studied. Results show that the concrete-filled steel tube rib arch has good elastic-plastic performances and high strength.