Analysis of Skew Bridge-Slab Under IRC Vehicle Loading

Skew slab bridges are essential in mountainous areas because topographic restrictions prevented changing the alignment of the road also, crossings of roads and railroads. In simple supported bridges, the effect of skew may typically be ignored up to 15 degrees of skew, and the bridge can be constructed as a right-angled bridge. The behaviour of skew slab bridges more than 15 degrees is complicated hence the study on the behaviour of skew-bridge slab under IRC vehicle loading is carried out. About 70 different deck slab models are analyzed in STAAD Pro software with varying width from 1 to 4 lanes, and span lengths of 7.5m and 12m with for skew angles 0° to 50° in increment of 10°.The vehicle loads and positioning of vehicles are done as per IRC-6:2017 standard specifications. The results show that the bending moment and deflection in near edge beams decreases with increase in skew angle. In farer edge beam the bending moment increase till skew of 30° and deflection increases after skew of 30°. The longitudinal bending moment decreases with increase in skew angle. Transverse bending moments are prominent at near the corners that at the centre. The torsion moments are more concerned in slabs with small width and large span. Deflection decreases at all the parts of the slab as skew increases. The maximum deflection in free edges of the slab shifts towards the obtuse corners.

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