| As the extensive use of box section, box section, the force also caused general concern of scholars home and abroad. However, box beam, resulting in bending of the lateral force to the flange passing through the ribs, while the shear stress distribution in the wing panel is uneven, the rib plate and the flange of the maximum junction with the left ribs increase the distance gradually decreases, therefore, shear deformation along the flange of the distribution is uneven. As the flange shear deformation inhomogeneity, caused by bending away from the ribs of the flange of the vertical displacement lags behind the ribs near the flange of the vertical displacement, the lateral bending stress distribution in a curve shape, this bending stress uneven distribution of the phenomenon known as shear lag effect.In this paper, this paper Jingyue Changjiang Gonglu Large Bridge (main span span combination (100 +298) m +816 m + (80 +2×75)) for the project background, the shear lag analysis of separate pairs of concrete box girder in Jingyue Changjiang Gonglu Large Bridge south span were analyzed. This article describes the three analogy method, energy method, finite element method the basic idea and formula calculation, and three kinds of methods are compared, and uses three analogy method to ansys the shear lag analysis of separate pairs of concrete box girder in Jingyue Changjiang Gonglu Large Bridge.This use of space finite element software ANSYS, on the south side of Jingyue Changjiang Gonglu Large Bridge Extra separated two concrete box girder span in the symmetrical concentrated loads, load distribution under the effect of shear lag, and the Structure of separate parameters on the cable-stayed bridge Concrete Double Box Girder of an analysis and evaluation.Jingyue Changjiang Gonglu Large Bridge on the south split between two concrete box girder cross-field strain data collection, focusing on the box roof to shear lag, and to compare the structure with the ANSYS analysis and evaluation.
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