Abstract
The paper is concerned with the reduced stiffness of slender (Class 4) cross-sections due to the increased in-plane deformability of buckled panels. The main purpose is to underline that the effective width for stiffness is not the same as that for strength on principle, and to give a theoretical evaluation of this fact. The analysis is carried out using an analytical large deflection solution based on reasonable assumptions with account taken of the initial imperfections. The results show that the theoretical effective width for stiffness is always larger than that for strength, and therefore, as a rule, a separate design equation should be provided. In this context, a new, Winter-type expression is proposed. On this basis, an extension of the effective-width concept for stiffness is suggested. The conclusions drawn are of practical interest especially in the case of design limited by deflections.
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