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Post-Buckling of Geometrically Imperfect Plates

1972; American Society of Civil Engineers; Volume: 98; Issue: 1 Linguagem: Inglês

10.1061/jsdeag.0003145

2690-3377

Ralph G. Dawson, A.C. Walker,

Structural Behavior of Reinforced Concrete

Explicit expressions are derived for the collapse and elastic post-buckling of simply supported, geometrically imperfect plates with stress-free edges. For the purposes of design, such plates can be taken as representative of the stiffened compression elements of thin-walled structural sections. Different generalized geometric imperfection parameters are studied and the effects compared to established test data obtained from cold-formed steel sections subjected to either bending or compression. For these sections a suitable and completely general parameter describing the imperfection amplitude, e0t, of a plate of thickness t is shown to be e0=0.2σy/σcr in which σy is the yield strength of the plate material; σcr is the theoretical local buckling stress of the equivalent ideal plate and is a direct function of its width to thickness ratio. This parameter is recommended for the design of cold-formed steel sections against local buckling.