Analysis Of Ultimate Bearing Capacity And Nolinear Stability About Concrete-Filled Steel Tubular Arch Rib

Concrete-filled steel tubular arch bridges have a great prospect in bridge structure development, because of its advantages of a high bearing capacity, toughness, convenient construction and good economic effects. Meanwhile, they solve the difficulties on construction and the application of high strength materials. This type of bridge develops rapidly and extensively in our country, but its research is still insufficient. As the bridge span increases, arch bridges transmit the applied loads to axial force mainly, which makes arch bridge uniquely susceptible to bucking failure, especially with the slender arch ribs.So it's significant of study on ultimate bearing capacity and stability about concrete-filled tubular arch.Firstly, this dissertation compares the bearing capacity of concrete filled steel tube on checking specification with various countries, gives a brief introduction to the concrete steel arch bridge design specification. And then, it explains arch's theory of stability and nonlinear finite element.It uses the software MIDAS/Civil2006 to build a three-dimensional finite element model of Wu Xiang Bridge (Concrete filled steel tubular arch bridge). Checks the bearing and stability capacity of arch ribs under different operating mode, and finds out the weak position of the bearing capacity design for concrete filled steel tubular arch ribs. Then analyses the model's stability of its overall linear elastic and geometric nonlinear and worked out its safety factor under different operating mode of its construction and operation phases. Through this analysis, it has something referential value for design and construction of the bridges with similar construction.