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RESEARCH PAPERS

Effects of Mode Interaction on Collapse of Short, Imperfect, Thin-Walled Columns

[+] Author and Article Information
David Hui

Department of Ocean Engineering, Massachusetts Institute of Technology, Cambridge, Mass. 02139

J. Appl. Mech 51(3), 566-573 (Sep 01, 1984) (8 pages) doi:10.1115/1.3167675 History: Received August 01, 1983; Revised January 01, 1984; Online July 21, 2009

Abstract

The present paper deals with the design of beneficial geometric imperfections of short, thin-walled columns in order to maximize their energy absorption. The investigation was motivated by the experimental finding that under axial compressive load, the symmetric mode (which has a higher buckling load than the antisymmetric mode) actually has a much higher energy absorption than the antisymmetric mode as measured by the area under the curve of applied load versus end-shortening curve. Thus, an attempt is made to introduce imperfections in the beneficial symmetric mode so that the mode shapes of extremely large deflection in plastic collapse will also be of the symmetric type. The two-mode stability problem is studied using Koiter’s theory of elastic stability.

Copyright © 1984 by ASME
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