Elasto‐Plastic Interaction Buckling of Cold‐Formed Channel Columns
Publication: Journal of Structural Engineering
Volume 117, Issue 8
Abstract
A new model has been developed to study the elasto‐plastic interaction between the local and Euler buckling modes in a cold‐formed thin‐walled channel column under concentric and eccentric loading. Plate (local) and column (overall) imperfections have been considered in the analysis. The locally buckled column can be treated as an assemblage of half wavelengths of local buckling of perfect column under uniform compression. Given these considerations, the elasto‐plastic M‐P‐Φ curves of the short sections that form the column are derived in the elasto‐plastic range by using the large deflection elasto‐plastic finite strip method developed by the writers. Then a beam‐column approach associated with finite integration is presented to predict the strength of the column by means of the M‐P‐Φ curves of the short sections of the column. An experimental program was carried out, and the moire fringe method was extended to a large area encompassing the whole length of the column. The comparison of experimental with theoretical results shows very good agreement.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 117 • Issue 8 • August 1991
Pages: 2278 - 2298
Copyright
Copyright © 1991 ASCE.
History
Published online: Aug 1, 1991
Published in print: Aug 1991
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