Abstract
This paper deals with 3-D linear elastic finite element analysis of box-girder bridges to study the influence of skewness on the longitudinal stresses and shear lag effect in simply supported box-girder bridges. In the present study, a 20 m span simply supported box-girder bridge with different degrees of skewness varying from 10 to 60° has been considered to investigate the effect of skew angle on transverse distribution of longitudinal stresses and coefficient of shear lag (CSL). The shear lag response of the skew box-girder bridges due to dead load has been compared with the right box-girder bridge, and it has been observed that up to 20° skewness, the CSL is not much affected by the skew angle; however, for the skew angles more than 20°, shear lag effect in the box girders decreases with increase in skew angle, and it becomes remarkably low compared to right box-girder bridges. Moreover, the study shows that for the highly skew bridges, the nature of longitudinal stresses alters.
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