Empirical Effective Width Formula

by Niels C. Lind, (A.M.ASCE), Prof. of Civ. Engrg.; Univ. of Waterloo, Waterloo, Ontario, Canada,
Gerald Schorn, Sr. Project Engr.; Peter Sheffield and Assocs., Toronto, Ontario, Canada,
Mayasandra K. Ravindra, (M.ASCE), Sr. Engrg. Analyst; Sargent & Lundy Engrs., Chicago, Ill.,

Serial Information: Journal of the Structural Division, 1976, Vol. 102, Issue 9, Pg. 1741-1757

Document Type: Journal Paper


The data basis for the effective width expression used in cold-formed steel design is analyzed statistically. Several plausible effective width formulas are studied. It is concluded that the effective width is not significantly different for most test data on plates, beams, and columns in steel (including cold-formed and stainless steel), with the exception of specimens welded without stress relief. There is no significant dependence of the effective width on the flat width of partially effective flanges. A new reliability-based effective width formula is then proposed for design.

Subject Headings: Cold-formed steel | Steel columns | Empirical equations | Effective width | Beam columns | Stainless steel | Steel beams | Steel plates

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