Warping Displacement of Skew Reinforced Concrete Box Girder Bridges

摘要

Skew reinforced concrete multi-cell box girder bridges are commonly used as over crossings inrnhighway intersections and interchanges, especially in complex intersections and in crowded areasrnwhere lack of space necessitates the use of skew geometry. Due to the unexpected behavior for thisrntype of bridges, skew box girder bridges are difficult in the analysis and design. Several researchrnefforts using theoretical as well as experimental approaches have been made over the past 20 yearsrnto understand the actual behavior of this type of bridges when subjected to static and dynamic loads.rnThe earlier design method for box girder bridges, or hollow girder type bridges, or the multi cellrnbridges was conservative and employed large web thickness to neglect the effect of distortion andrnwarping stresses. However, with the present tendency to use thin web thickness to reduce selfweightrnof the structure, the associated distortion and warping effects become significant and must berntaken into consideration during the design procedure.rnThis paper presents the effect of varying the skew angle on the warping displacement and thernvertical reactions of skew box girder bridges. The theoretical results obtained using threedimensionalrnnon-linear finite element program for three R.C. box girders are represented. Allrngirders have the same dimensions and the same reinforcement in both longitudinal and transverserndirections but with different skew angles. The specimens were analyzed under an eccentric staticrnconcentrated load acting at mid span section of the outer web to investigate the effect of varying thernskew angle.