Localised Web Buckling Strength Analysis of Parallel Flange Steel Beam due to Geometric Imperfections
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Abstract
The structural performance of parallel flange I-section steel beams is significantly influenced by localized web buckling, particularly under compressive and shear forces. Geometric imperfections, including initial out-of-plane web deformation, flange waviness, web thickness variation, residual stresses and welding distortions, can exacerbate web buckling, leading to premature failure. This study investigates the localized web buckling strength of a parallel flange I-section steel beam with widths ranging from 210 mm to 350 mm and depths ranging from 600 mm to 1750 mm by incorporating these geometric imperfections into numerical models using IDEA StatiCa and Abaqus. A nonlinear finite element analysis (FEA) approach is adopted, where IDEA StatiCa is utilized for structural stability assessment and section capacity verification, while Abaqus is employed to conduct detailed nonlinear buckling simulations. The study examines the influence of imperfection magnitudes, varying web slenderness ratios and different loading conditions. The primary objective is to establish a correlation between imperfection effects and web buckling resistance, providing insights into critical buckling loads and post-buckling behavior. The study is conducted in accordance with the provisions of the Indian Standard IS 800:2007 - General Construction in Steel. The provisions related to web slenderness, buckling coefficients and effective width calculations are incorporated into the analysis to validate the numerical results against theoretical predictions.
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