Shear Lag Analysis of Simply Supported Box Girders Considering Axial Equilibrium and Shear Deformation

The conventional methods used to analyze the shear lag effect in simply supported box girders assume that neutral axis of section coincides with centroid, which does not strictly satisfy axial equilibrium condition. To address this problem, study proposes an analysis method three independent functions for are employed define different strengths top slab, bottom and cantilever slab. fulfill condition girder automatically locate position, longitudinal displacement web is introduced. deformation also considered. governing differential equations corresponding boundary conditions variables such as deflection rotation derived through application principle virtual work. solved by utilizing obtain analytical expressions function, web, rotation, deflection, position. Furthermore, after performing finite element analysis, effectiveness proposed verified comparing results those obtained from analysis. influence quantified on force stress difference ratios under methods. Finally, extensive parametric carried out investigate parameter flanges. show when considered, stresses upper flange underestimated, especially at intersection top, lower overestimated. As a result, able calculate deflections more accurately.