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This paper deals with the in-plane ultimate strength of steel frames with the thin-walled box sections subjected to the vertical loads. Firstly, a numerical method for analyzing the “critical strength” of frames with the initial imperfections in elasto-plastic regions is developed on the basis of second order analysis by approximating the influences of local buckling of thin-walled column elements on the overall buckling collapse. Secondly, an experimental study is performed on the test specimens of five portal frames. Finally, the effective column lengths of frames are discussed and an approximate method to evaluate the critical strength of frames are proposed through experimental and theoretical studies.

IN-PLANE CRITICAL STRENGTH OF THIN-WALLED STEEL FRAMES SUBJECTED TO VERTICAL LOADS