Lateral Postbuckling Analysis of Beam Columns
Publication: Journal of Engineering Mechanics
Volume 120, Issue 4
Abstract
The elastic lateral postbuckling response of geometrically perfect beams, under simultaneously uniform bending and axial compression, is examined in the vicinity of the critical bifurcational state. The field equations, which include the warping effect of the cross section, are highly nonlinear due to the nonlinear bending‐moment‐curvature relationship. The stability of the critical state associated with a stable bifurcation point is analytically established using a comprehensive approach. Therefore, these beam columns are not sensitive to initial imperfections, exhibiting postbuckling strength. However, the postbuckling equilibrium path is quite shallow (becoming more shallow with the increase of the axial force), so the load‐carrying capacity of such beam columns above the critical state is rather limited. The analysis is supplemented by illustrative examples for I‐beam columns for which the effect of various parameters on the initial postbuckling path is also discussed.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 120 • Issue 4 • April 1994
Pages: 695 - 706
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Dec 16, 1991
Published online: Apr 1, 1994
Published in print: Apr 1994
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