Effect of skew angle on longitudinal girder (support shear, moment, torsion) and deck slab of an IRC skew bridge

摘要

This paper presents the behavioural aspects of a skew bridge and compares them with those of the straight counterparts using a 3D Bridge model in Finite Element Analysis software - ABAQUS. To understand the trend clearly, a simply supported RC Bridge was adopted. The results of the bridge model in ABAQUS show that with the increase in the skew angle, the support shear and mid-span moments of obtuse longitudinal girders increase while these parameters decrease in the corresponding acute longitudinal girders. Most importantly, the increasing skew angle rapidly increases the torsional moment in the obtuse angled girder. Such changes in the moment are generally not considered while designing a straight bridge. With increasing skew angle, the slab showed asymmetric bending with increasing deflection at obtuse corner and decreasing deflection at the acute corner.