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This paper reports the in-plane “critical strength” representing the buckling or ultimate strength of thin-walled steel frames subjected to the combined actions of vertical and horizontal loads. To investigate the critical strength of steel frames, an experimental study is performed by using seven portal frame models with thin-walled box cross-section. The critical strengths of portal frames are also inquired on the basis of elasto-plastic and second order analysis including the approximate method for evaluating the local buckling of thin-walled column sections. Through these results, the lower bound of critical strength of frames is clarified in detail. Finally, two approximate methods for estimating critical strength of thin-walled steel frames are proposed herein.

A STUDY ON CRITICAL STRENGTH OF THIN-WALLED STEEL FRAMES SUBJECTED TO COMBINATIONS OF VERTICAL AND HORIZONTAL LOADS