Research on the Influence of Tubular Initial Stress to Ultimate Bearing Capacity of Concrete-Filled Steel Tube(Single Tube) Arch Rib

This composite material Concrete-Filled Steel Tube promotes the development of CFST arch bridges with its self advantage; yet unavoidable initial stress problem comes especially to long-span arch bridge. This paper built solid-beam method by numerical analysis mean,selected the constitutive model both core concrete and steel tube,deducted the elastic and plastic tangential stiffness matrix,and drawn up calculating program for ultimate bearing capacity using Visual Fortran language,through drawing into initial stress coefficient to explore different initial stress coefficient toward to the influence of ultimate bearing capacity. The result makes important guiding significance for research on the Influence of tubular initial stress to ultimate bearing capacity of concrete filled steel tubular arch bridge.