Skew Effect on Box Girder Bridge

This study presents the effect of the skew angle on a simply supported box girder bridge. CSiBridge v.20 software is used for the analysis which is based on the finite element method. The mesh size is selected from the convergence study. The variation of absolute bending moment, shear force and vertical deflection due to dead load and live load for both girders is evaluated. The bridge having skew angles up to 20° can be analysed and designed as a straight one. The equations for bending moment ratio, shear force ratio and vertical deflection ratio are deduced so that the forces and deflection of skew box girder bridges can be determined directly from the straight one. This study's results may be useful to the designer for a preliminary analysis of skew bridges.