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This paper presents a numerical study for lateral distortional buckling of I-plate girders (LDBIPGs) by using the general-purpose finite element package ABAQUS (version 6.13) software. 3-D finite element (FE) models for simply supported IPGs subjected to two cases of loading are built. The first case of loading was uniform end moment that was introduced by a couple of forces applied at the top and bottom flanges of the IPGs. The second case of loading was a concentrated load at the shear center in the mid-span. First, shell finite element models are validated by comparing the FE critical bending moment (Mcr,FE) by the critical bending moment in EC3 code (Mcr,o,LTB ). The results indicate that the Mcr,FE was in good agreement with Mcr,o,LTB . Secondly, a preliminary analysis is conducted to the relative girder slenderness (λ) where the LDB too place. Finally, a parametric study is carried out on simply supported IPGs regarding to the span length, the flange cross-section dimensions and the thickness of the web. The results showed that increasing the length of girders decreases Mcr.FE and increase in the bending coefficient factor ( Cb ). Also, decreasing in the web plate slenderness ratio (hw tw ⁄ ) works on increasing in Mcr.FE values and Cb . The results also showed that the increasing in the thickness of flange increases Mcr.FE and increase the value of Cb with small value. As a result of parametric study, the mean value and standard deviation of Cb for LDB mode are 1.16 and 0.08 respectively for λ limits (90:130). For λ limits (131:175), the mean value and standard deviation of Cb are 1.27 and 0.03 respectively. As for λ limits (176:221), the mean value and standard deviation of Cb are 1.32 and 0.02 respectively.

The Lateral Distortional Buckling of I-Plate Girders