Analysis and Behaviour of Skewed Box Girder Bridge

Abstract

Box girder bridge differs from the other bridges in that it is having better stability, economy and having
aesthetic appearance. Box girder bridges are having good strength and torsional stiffness. Mostly for
the long span, box girder is used. In this study, skew angles of 0 to 60° show different results in forces
and moments. The effect of skew angle 0 to 60° with same span is different. In the present study, the
span is having length of 31 m span and effective span of 30 m. The box girder of two cells is having the
width 9.5 m and depth 2.5 m. In this study, the various IRC codes are used for the loadings. STAAD
PRO V8i Software has been used for analysis of the Grillage Model. The models are simply supported.
The main parameters used in the study are the deflections, bending moments, support reactions and
torsions. These parameters increase with the increase in skew angle from 0 to 60°. It is quite interesting
that torsion is exaggerated to a great extent than bending moment and defection. The effect of skew
angle for reaction and torsion are mainly observed in obtuse corner than the acute corner.

Keywords: Box girder bridge, grillage model, skew angle 0 to 60°, bending moment, shear force,
deflection, and torsion, STAAD Pro