Experimental Study On Transverse Internal Force Of Double-deck Traffic Simply Supported Concrete Box Girder

Traditional ordinary concrete box girder bridge with good integrity, torsionalrigidity, excellent dynamic characteristics, construction methods varied advantages,especially for medium-span bridge city. Double Traffic concrete box girder is aninnovative application infrastructure while maintaining the traditional ordinaryconcrete box girder on. It is reasonable to improve the form of ordinary concrete boxgirder structure to ensure the necessary clearance requirements, cancellationconventional diaphragms box set to the top, bottom lines are becoming deck, whilethe creation of the necessary holes in the web to meet ventilation, lighting and fireprotection requirements, in as much as possible to retain the advantages of ordinaryconcrete box-section members can take advantage of the box girder while theinternal structure of the space, in order to achieve double the traffic. The main ideaof this paper is to explore new types of structures to study the transverse forceperformance by lateral force performance tests under different conditions appliedload on the model box girder, its stage in the elastic deformation of the deflection,the force distribution be the case, the top, bottom transverse strain distribution, etc.Experimental study and numerical simulation using finite element analysis softwareANSYS, the actual testing process numerical simulation analysis, then analyzecomparative analysis of finite element numerical simulation results and experimentalresults, the final get some traffic to double concrete box girder meaningfulconclusions, so that the design and realization of the practical application of newconcrete structural system provides double the traffic of reference. The main resultsobtained are as follows:1.Load cases of the same kind of up and down loaded at a stiffening ring,cross-section of the stiffening ring (4-4section) deflection maximum difference of5%, the opening cross-section (3-3section) maximum deflection difference reaches23%. When the same kind of load cases in the two upper and lower load stiffeningring cross-section of the stiffener ring (4-4section) deflection maximum differenceof7%, the opening cross-section (3-3section) maximum deflection difference of12%. Description Set-section transverse stiffener ring effectively raising the sectionstiffness, thereby improving the integrity of the beam, which can effectively reducethe impact on the overall deflection of the load position on the model box girder.2. In four different load cases the role of acting as load cases the floor box beam deflection deformation when compared to the load case to a large role in the roof, inwhich the three conditions that Charpy across the bottom stiffener ring two spotssymmetrical concentrated loads of maximum deflection.3. Due to the large size hole in box girder webs, resulting in weakened sectionstiffness，in working condition one and working conditions three，model longitudinalbeam deflection curve curvature mutation phenomenon occurs at2m and6m place.Suggestions to reducing the hole size or increasing the web-sectional measures toimprove the stiffener ring box girder rigidity, thereby improving the integrity.4. The box girder model under the effect of five different load cases, the roof#1to#4beams were allocated about40%of the load, the floor#5to#8beamswere allocated about60%of the load.5. When the load in the4-4section of the roof sections that span stiffening ring,that condition a cross-section that is loaded,4-4transverse strain distribution in thecross section of the top and bottom plates are basically the same, the value of themeasured strain size very close， the maximum difference of5%. When thecross-section that loads in4-4stiffening ring cross-section across the floor, thatthree load conditions, the lateral strain roof significantly reduced. And the top andlateral tensile stress generated at the junction edge of the web to be significantlygreater than the transverse tensile stress is generated at the junction with theintermediate web.6. When the load in the box girder cross-section of the roof opening segment,namely two load conditions, due to the impact of the web openings to pass internalforces, leading to the chamber roof tensile stress increases phenomenon.