Parameter Sensitivity Study Of The Long-Span Steel-Concrete Composite Curved Box Beam

Steel-concrete composite curved box girder bridge is a new structure whichconnected to the concrete deck and the one or more of steel box girder by shearconnectors. Composite steel and concrete can compensate for the lack of reinforcedconcrete box girder bridges and steel bridges; on the comprehensive benefits it hascertain advantages at the same time.This paper based on the long-span steel-concrete composite curved box girderbridge’s mechanical features, combined with the basic theory and the mechanism oftransfer surface, by introducing the Goodman theory of elasticity, obtained the internalforces and deformation of the differential equation in considering the warping, thengived the general solution in the case of simplify the coefficient. Using ANSYS withthe appropriate elements type and material constitutive models to establish up thesteel-concrete composite straight box girder bridge’s analysis model, by comparing thesimulation and experimental results to verify the constitutive elements’ and materials’rationality and accuracy. Then according to the curved box girder bridge’s mechanicalcharacteristics show that this model can extende to long-span steel-concrete compositecurved box girder bridge nonlinear simulation.This paper was divided the support and mid-span cross section by long-spansteel-concrete composite curved box girder bridge to three directions: abaxial surfaceand adaxial surface of the concrete surface and the steel box girder bottom. And studythe long-span steel-concretethe combination of curved box girder bridge’s shear lageffect along each direction with different central angle, reinforced concrete plate’sthickness and height of the steel box girder. This paper will use ANSYS software with the combine of plastic and elasticdesign method. By comparative analysis of long-span steel-concrete composite curvedbox girder bridge’s node location and displacement diagram when the shear connectorspacing is set to200mm,400mm,800mm,1000mm and no shear connectors, fined therational spacing of shear connectors. Then build the ANSYS analysis mode with thisspacing to study the geometric design parameters’(the thickness of the concrete slab,steel beam web and bottom plate thickness, steel beams high-span ratio and the radiusof curvature, etc.) influence of the long-span steel-concrete composite curved boxgirder bridges’ carrying capacity.This research can offer some suggestions for choose the element type and materialconstitutive model in the long-span steel-concrete composite curved box girderbridge’s analysis work.Through on the analysis of long-span steel-concrete compositecurved box girder bridge with variable parameters, study the impact of these variousparameters on the structure’s shear lag effect and carrying capacity law. These resultscan provide a theoretical basis for the similar design and supplya reference for theapplication of the long-span steel-concrete composite curved box girder bridge curvedbox girder bridge.