Analysis of Section Deformation of Flat Steel Box Girder of Long Span Cable-Stayed Bridge During Cantilever Installation

With reference to the construction scheme for cantilever installation of flat steel box girder of the cable-stayed bridge of Sutong Bridge with 2 sets of cranes and 8 supporting points,this paper presents the application of hybrid finite element method to the analysis of relative deformation of the assembled sections of the box girder and the calculation results obtained with the method.The method in question can take account of both the global mechanical behavior, longitudinal and transverse local stress conditions of the cantilevering system of the box girder,and influences of the global mechanical behavior and local stress conditions on the deformation of the sections of the girder.The calculation results may serve as reference to the design and cantilever installation of steel box girders of other long span cable-stayed bridges.