Abstract
The chapter examines the role and influence of imperfections on the ultimate strength of thin-walled cold-formed steel sections. The chapter considers both material and geometrical imperfections, and presents recommendations for numerical simulations. The chapter explains that the influence of the increase of yield strength at the corners of a given section on its ultimate strength depends on the ratio between the corner areas and total area of cross-section. A larger bent radius generates a larger area of the corners. In case of small corner radii, the cold-forming effect is negligible. The appropriate identification and selection of imperfection shape and size associated to the relevant instability mode is crucial for the ultimate strength analysis. In a two-mode interacting buckling, different shapes of local-sectional imperfections have different effects on the ultimate strength of the member. The most sensitive is the distortional-overall interactive buckling. Numerical studies performed and results obtained show that there is no significant influence of flexural residual stresses on the ultimate strength of sections.
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