Post-Buckling of Redundant Rectangular Beams

by Scott T. Woolcock, Research Student in Civ. Engrg.; Univ. of Sydney, Sydney, New South Wales, Australia,
Nicholas S. Trahair, (M.ASCE), Assoc. Prof. in Civ. Engrg.; Univ. of Sydney, Sydney, New South Wales, Australia,


Serial Information: Journal of the Engineering Mechanics Division, 1975, Vol. 101, Issue 4, Pg. 301-316


Document Type: Journal Paper

Discussion: Masur Ernest F. (See full record)
Closure: (See full record)

Abstract: The post-buckling behavior of redundant single-span rectangular members is investigated using an equilibrium approach and large potential reserves of strength are shown to exist. In some cases, loads up to three times the initial buckling loads can be supported before the deformations and stresses exceed acceptable limits. These reserves of strength are due to a redistribution of the primary bending moment after buckling. The mechanism of redistribution is examined and explained. The effect of slenderness on a beam's ability to develop its reserve of strength is studied, and it is concluded that many practical beams will be unable to fully develop their post-buckling strengths because of premature yielding.

Subject Headings: Structural strength | Post buckling | Beams | Load factors | Equilibrium | Deformation (mechanics)

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