Abstract
Strength evaluation and optimality of steel compression members are examined focusing on the interactive behavior between overall and local failures. The results of optimization indicate that optimal and efficient design is basically obtained in the region where the local buckling does not occur before yielding of component plates, even if the occurrence of local buckling is allowed for design. This implies that restricting the local buckling by specifying the maximum width thickness ratios may be worth while again to consider to accommodate in design specifications, particularly for ordinary civil engineering structures. The practical importance of allowing the occurrence of local buckling may appear only in the designs of large scale and/or specialty-oriented steel structures and components.
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