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ABSTRACT
The aim of this article is to introduce the elementary phenomena of structural instability specific to bars. Buckling concerns an axially compressed element (pole for instance). The critical load, buckling length, geometrical imperfections and the effects of residual constraints are many of the aspects which concern the flexural buckling of bars. The elastic critical loads and the determination of the ultimate flexural or flexural-torsional buckling load are explained. The buckling of beams, their generalities, the moment of critical elastic buckling and the determination of the precise moment of this buckling process conclude this article.
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Read the articleAUTHOR
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René MAQUOI: Civil construction engineer - Professor Emeritus, University of Liège
INTRODUCTION
When compressed over all or part of their cross-section, bar-type structural elements are likely to see their load-bearing capacity affected by instability phenomena. In the case of an axially compressed element (column), such a phenomenon is referred to as "buckling". For an element subjected to bending (beam) around the axis of high inertia of its cross-section, under the action of end moments and/or transverse loads, it is referred to as "tilting". The greater the bar's slenderness, the greater the instability.
This dossier introduces the basic principles that led to the development of dimensional buckling and torsional buckling curves. The practical application of these curves in the context of regulatory verifications is developed elsewhere, more specifically in the files dealing with compressed or bent structural steel components.
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Structural instability of bars
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