| The concrete bridge deck near the fulcrum of large span steel-concrete continuou composite box girder bridge is in tension, and the bottom flange of steel girder is in compression. There are many structural measures to dealt with design of hogging moment zone in the continues composite bridge, such as setting prestress bars, performing double composite action and placing perfobond ribs. Also there are many construction methods to dealt with that, such as arranging proper sequence of construction, and jecking down griders. The stability of bottom flange of steel girder and the web in hogging moment zone is usually considered.In order to obtain the moments distribution of internal forces of decks of Concrete bridge shear connector and steel box girder bridge in control section, stress in Box girder section of hogging moment zone is comparatively complex, a quarter of the original structure was researched.The distribution mode and path of force transfer of prestressing effect between concrete bridge deck and steel box girder bridge in hogging moment zone is researched with the prestress load experiment. This result provide a scientific basis for the bridge design and construction of key technology decisions.Internal Force, distortion and crack development in service load and ultimate load is verified with load applied in hogging moment zone, performance and safety of steel box girder bridge is verified, the results of the test could be used to guide the optimal design of the overall structure.The local stability of stiffening rib of webs for steel girder is researched by finite element analysis. The reasonable and effective arrangement of stiffening rib provides a reference value for design of bridge. |
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