Analysis Method for Transverse Force Conditions of Steel Anchor Box Anchor System in Pylon of Long Span Cable-Stayed Bridge

In the cable-to-pylon anchor zone of long span cable-stayed bridge,the steel anchor box and concrete walls form a steel and concrete composite structure,in which the tensile steelplates of the anchor box and the concrete side walls jointly bear the horizontal component of stay cables and the complicated composite effect therefore exits in between both ends of the anchor box and the concrete front walls.Taking the 5-span separated continuous steel box girder cable-stayed bridge of Shanghai Changjiang River Bridge having a main span 750 m as an example,this paper firstly analyzes the composite structure of the steel anchor box and concrete walls,using four simplified two-dimensional models and obtains an accurate simplified calculation model after analytical comparison.Then,the paper compares the recommended two-dimensional model to the three-dimensional model,verifies the correctness of the two-dimensional model and concludes that the two-dimensional model can be popularized and applied to the analysis of transverse force conditions of the composite structures of the cable-to-pylon anchor zones.