Ultimate Capacity of Slender Section Beam-Columns with Corrugated Webs

The behavior and strength of slender section beam-columns with corrugated webs under eccentric and concentric loading are affected by many geometric parameters. The effect of these parameters has been studied analytically in the present work. A large number of members having different slenderness ratios, flange width-thickness ratio, web depth-thickness ratio, web panel width-thickness ratio, and corrugation depth-flange width ratio; are investigated. The recommended inclination angle (45°) of corrugated web panel that gives best results for low, intermediate and high slenderness ratio is used in the present study. Complete ultimate strengthmember slenderness ratio curves are presented. Failure modes observed are local, interactive local-global and overall buckling. For design purpose; a series of interaction curves for slender Isection beam-columns with corrugated webs were drawn with different normal forces along with either major axis moments or minor axis moments. It is generally considered that the contribution of the web to the ultimate capacity of a beam-column with corrugated web is negligible, and the ultimate capacity will be based on the flanges yield stress. The flange width-thickness ratio is much more effective on the ultimate stress capacity of the member than the web depth-thickness ratio. The member ultimate stress decreases with the increase of web sub panel width-thickness ratio. For members having major axis bending, flange width-thickness ratio has major effect on the member capacity more than that of the web depth-thickness ratio because the flanges have the main role in load carrying capacity.

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