The Structural Engineer > Archive > Volume 69 (1991) > Issues > Issue 5 > Available Rotation Capacity in Steel and Composite Beams
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Available Rotation Capacity in Steel and Composite Beams

A general criterion is described for assessing the inelastic rotation capacity of structural members and their connections. The results of 44 tests on the inelastic behaviour of steel I-sections under moment gradient are analysed by considering the relative influence on available rotation capacity of parameters normally associated with local and lateral buckling, as well as other effects described in earlier research. Two modes of failure are identified: lateral buckling dominant and inducing local flange buckling at higher lateral slenderness ratios and local flange buckling dominant and inducing lateral and local web buckling at lower lateral slenderness ratios. The onset of strain-weakening behaviour is assessed for both modes of failure of steel I-sections in plain steel and composite structures. It is concluded that there is no clear justification for a difference in the local buckling provisions for steel and composite beams. Professor A.R. Kemp and N.W. Dekker