桁式钢管混凝土拱桥面内极限承载受力研究

Studies on Ultimate Bearing Capacity of Concrete-filled Truss-formed Steel Tube Arch Bridge under In-plane Loads

以4管桁式钢管混凝土拱桥为实例,采用弹塑性大变形计算理论,对拱桥面内极限承载受力全过程进行研究。对拱肋失稳形态和拱肋竖向位移、轴力、弯矩的发展等方面作了比较。最后对钢管混凝土拱桥设计规范(修订稿)中的简化计算方法进行了讨论。

With the example of a four-tubed concrete-filled truss-formed steel tube arch bridge, the theory of elastic-plastic deformation calculation is adopted for the study of the whole process of the ultimate bearing of the arch bridge under in-plane loads, with a comparison of the unstable status and the development of the vertical displacement, axial force, bending moment of the arch rib, and final discussions according to the simplified method of calculation in the specification (revised) for the design of concrete-filled steel tube arch bridges.