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The aim of this paper is to clarify the influence of different levels of initial imperfections and the effect of web dimensions for T stiffener on the estimation of the critical buckling stress of stiffened panels under axial and combined loads using Ansys software. The post buckling behavior of the plate-stiffener combination consisting of a T-girder with the attached effective plating between two adjacent transverse frames is investigated in case of longitudinal axial load and of combined longitudinal axial load and lateral pressure as normally encountered in bottom and deck panels. To accomplish the intended parametric study, the sections modeled have been classified into two sets according to different values of web depth and different values of web thickness.
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