Research On Prestressed Concrete Steel Tank Composite Beam Girder Bridge Structure

For the first time prestressed concrete steel tank composite beam girder bridge isused in practical engineering, this structure is based on concrete beam and steel beamand continued optimization of the structure. The form solves the reinforced concretebox girder weight problem, simplify the welding of steel, which simplifies thewelding of steel, save the cost. Especially the composite beam which of steel tankcomposite beam and concrete deck, solve the problem of steel box girder bridgedeck breakage problem. This form has been used in the domestic and overseas bridge.For this form in accordance with the developing direction of long-span Bridges,adapting to the international advanced technology development, it is necessary to dosome research on prestressed concrete steel tank composite beam girder bridge.This paper is based on G318National highway bridge and Erqi Yangtze riverbridge6×90m approach bridge in hankou side. Mainly studied the following aspectsof restressed concrete steel tank composite beam girder bridge.Firstly, horizontal analysis: this new form of brige is both Hybrid girder bridgeand composite beam. In order to get further study of this new structure, this paperstudied the two structure respectively. Longitudinal analysis: Through comparison ofsteel box girder system, concrete box girder system and concrete steel tank compositebeam girder system, this paper get the advantages of this new form. In addition, thisresearch summarize design and calculation method of steel beams, reinforcedconcrete bridge decks and shear connectors respectively.Secondly, based on318National highway bridge, this research build a model ofsteel box girder through the finite element software MIDAS, reference to erqi Yangtzeriver bridge of hankou side approach of Prestressed concrete steel tank compositebeam girder section, to redegign a steel tank composite beam finite element model.Through analyzing the calculation data, this research concluded it’s stresscharacteristics and excellent performance.Finally, by build considering slip and regardless of the slip effect models bridgemidas model, this research studies the effect of slip sliding effect on Prestressed concrete steel tank composite beam girder bridge mechanical behavior. Slip effectwill lead to the structural deflection increases, especially in the area of midspan,compressive stress and tensile stress value of steel tank composite beam also becomelarge. Therefore, we need to protect the bond strength between the steel beams andconcrete deck during design process.