EFFECT OF SKEW ANGLE ON STATIC BEHAVIOUR OF REINFORCED CONCRETE SLAB BRIDGE DECKS

Abstract

The effect of a skew angle on single-span reinforced concrete bridges is analyzed using the finite-element method and the results are presented in this paper. Investigations are carried out on RC slab bridge decks with and without edge beams to study the influence of aspect ratio, skew angle and type of load. The finite-element analysis results for skewed bridges are compared to the reference straight bridges for dead load, IRC Class A loading and IRC 70R loading for with and without edge beam. A total of 90 bridge models are analyzed. The variation of maximum deflection, maximum longitudinal sagging bending moment, maximum torsional moment, and maximum support reaction with skew angle is studied for all 90 bridge deck models. The FEA results of Dead load and Live load bending moments and deflections decreases with increase in skew angle, where as maximum support reactions increases with increase in skew angle and the maximum torsional moment increases with skew angle up to 45 degrees and there after decreases. The benefit of providing edge beam is reflected in significant decrease in deflection, longitudinal bending moment and torsional moment.