Plastic Torsional Buckling of Cruciform Compression Members
Publication: Journal of Engineering Mechanics
Volume 129, Issue 6
Abstract
In this paper the plastic torsional buckling of a cruciform column is revisited. The interest in this classical problem resurfaced from a practical application in the area of seismic protection of structures. The theoretical challenges associated with this problem emerge from the “paradoxial” differences between the plastic buckling strength that results from the total deformation and the incremental theories of plasticity. The paper shows that when the flanges of the column are not perfectly straight, the incremental theory of plasticity predicts that at the onset of plastic torsional buckling, the shear stress and the shear strain are related with the tangent shear modulus. The analysis presented herein involves a small-strain theory, examines the column at its slightly deformed configuration, and results are obtained with hand calculations. Experimental evidence supporting the theoretical findings is presented.
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Published In
Journal of Engineering Mechanics
Volume 129 • Issue 6 • June 2003
Pages: 689 - 696
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Jan 28, 2002
Accepted: Sep 25, 2002
Published online: May 15, 2003
Published in print: Jun 2003
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