Stress Analysis For Large Span Arch Bridge Abutment Of Concrete Filled Steel Tube

The design of the bridge have the trends that from a simple use to aesthetics, and culturaldevelopment. Along with the diversity of aesthetic process, to bring the structural system andthe complex local force trends have become increasingly prominent. Due to the local structureof uneven force and adverse structural measures which threaten part of the bridge and evenendanger the overall structure. Therefore it is necessary to use the finite element analysis tomake the force more clearly, and provide a solid foundation for the future design, operationand maintenance.This paper takes a semi-supported arch bridge as an example, according to thecharacteristics of semi-supported arch bridge, on the basis of integral bridge analysis, thepaper worked on the local stress analysis of arch bridge. This paper expounds the concretefilled steel tube arch bridge calculation theory and finite element simulation method, on thebasis of full bridge integral analysis of the Midas/Civil model, with space beam element tosimulate cross beam, beam, longitudinal beam and arch rib in other components, hasestablished the bridge space finite element model, extracted from a representative thecombination of loads at the abutment corresponding internal force, which were loaded intoone Midas/FEA model for local stress analysis. We can found that the whole bridge structurestress is reasonable by the model of the abutment stress and the unfavourable loadcombination arch axial force as well as the shear force and bending diagram. At the same time,we can found that the stress of the intersection on which the arch of the foot connected withthe skewback is higher. That is, this has beyond the design strength of concrete control stressvalue. According to the stress calculation of arch, we can improve the stress of theconcentration position force condition by reinforcing steel bar mesh on the local compression.Compared with the analysis of C20, C25, C30, C35and C40and their stress distributions, we discovered that the abutment maximum principal tensile stress changed with the grade ofconcrete strength increases, and the maximum principal compressive stress also changed withthe strength grade of concrete.Research results show that, in the process of structural design, paying attention to thelocal stress analysis to make force clear is necessary, the paper results has certain referencesignificance to similar bridges and other types of bridges.