JCE_V3_N4_RP1 Shitalkumar Chaudhari Akhil Upadhyay Journal on Civil Engineering 2249 - 0779 3 4 1 15 Box Girder, FRP Box Girder, Distortional Behaviour, Distortional Stress, Warping Stress Analysis of longitudinal bending and pure torsion can be made by means of elementary theories while distortional effects in the box girders cannot be predicted by these theories. The distortional action of the box girder consists of (a) transverse deformation and (b) longitudinal deformation (warping). Laminated composites, which are of orthotropic nature were initially limited to aerospace applications, but now gradually they are being applied in structural applications. The orthotropic nature of FRP has to be taken into consideration in all these analysis. The effect of orthotropy due to fiber orientations is studied by changing the orthotropy ratio of different elements of the FRP single- cell box beam subjected to the distortional loading. Similarly, the effect of cross-sectional parameters on the distortional stresses is also studied. All these analysis is carried out by using the FEM package ANSYS 7.1. Then BEF charts are developed for 0, ± 45, 90 fiber orientations of the box beam and these charts are validated for different cross-sections as well as different geometrical properties. September - November 2013 Copyright © 2013 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=2521