Steel Pipe Concrete Arch Structure Of The Mechanical Properties And Truss Arch Calculation Method

The paper puts great emphasis on studying the mechanical performance and the carrying capacity of concrete-filled steel tubular (CFST), verifies the cyclo- hoop effect which steel tubular has exert to the concrete in CFST through the tridimensional finite element analysis of the entity of the arch rib, and proves that the cyclo- hoop effect is utilized to increase the axial compression CFST member carrying capacity . The cyclo- hoop effect which steel tubular has exert to the concrete shows the character of heterogeneous in the arch rib section, the same to the axial direction .The paper verifies the change of the material poisson ration and the concrete grade will make the cyclo- hoop effect obvious alteration, the change of the cyclo- hoop effect and the stress redistribution of the section produced by the shrinking and creeping of the concrete and the expensive concrete on the section. And the basal laws of these changes are also summed up in the paper.In the paper, rectangle concrete cross section with steel band to replace approximatively the mutil-limb steel tubular truss section is brought up to calculate and check calculation in the CFST arch bridge .The method has been verified partially by the procedure ALGOR93 and can be applied in actual engineering .