Simplified Analytical Model for Predicting the Transverse Stress of Steel Box Girder with Large Cantilevers in Cable-Stayed Bridges | Journal of Bridge Engineering | Vol 28, No 1

AbstractThe geometry and structural behavior of steel box girders with large cantilevers utilized in cable-stayed bridges are intricate. Due to the large cantilever, the transverse stress in the steel box girder cannot be ignored. To investigate the transverse stress distribution law of the steel box girder, a test was conducted on a 1:4.5 scale segment of a cantilever steel box girder in a cable-stayed bridge model. The distribution patterns of the transverse stress in the top and bottom plates of the steel box girder under six distinct load cases were analyzed. It was discovered that positive and negative transverse stresses appeared simultaneously in the top plate when solely subjected to the train load, whereas this phenomenon did not occur in the bottom plate. Furthermore, an improved simplified analytical model was proposed for predicting the transverse stress of the steel box girder. In comparison with the results of the test model, the rationality of the simplified analytical model was substantiated. Moreover, on the basis of the simplified analytical model, the phenomenon of concurrently occurring positive and negative transverse stresses was explained, and the maximum transverse stress distribution in the top and bottom plates under the action of a unit moving load was obtained. The location of the maximum transverse stress in the top and bottom plates was also discussed. The outcome of this paper could serve as a reference in the design of steel box girders with large cantilevers in cable-stayed bridges.



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