Moment-Rotation Curves for Locally Buckling Beams

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Abstract
Tests on composite steel-concrete beams have shown these sections to be highly susceptible to local buckling under negative bending. To further the application of plastic design to continuous composite beams an approxiamte method of predicting the moment-rotation curve of a locally buckling I-shape is developed. The method is based on the upper-bound plastic limit theorem. Solutions are given for two buckling mechanisms and their applicability is determined from test results and web slenderness criteria. Comparisons between the theoretical predictions and several test curves show consistently conservative, but reasonable agreement.

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