Author: Ashkinadze, Konstantin

Source: Canadian Journal of Civil Engineering, Volume 34, Number 4, April 2007 , pp. 576-579(4)

Publisher: NRC Research Press

Abstract:

This technical note considers weak axis moment capacity of wide-flange steel members of different section classes. In CSA S16-01 Limit states design of steel structures, there is a disconnect in moment capacity of laterally supported members between Classes 2 and 3: when the section crosses the Class 2 boundary, its calculated capacity drops in the ratio of the elastic to plastic section modulus. This effect is relatively minor for strong axis bending but is rather significant for weak axis bending. A rational theory is presented that explains the phenomena on the transition of the two Classes and proves that the noted gap in the design capacity does not exist. An improved design formula is proposed to mitigate this problem.Key words: bending, class, flange, local buckling, steel beams, strong axis, weak axis.

Cette note technique aborde la capacité de résistance au moment de l'axe de moindre résistance de membrures en acier à large bride de différents profils. La norme CSA S16-01 Règles de calcul aux états limites des charpentes en acier présente différentes capacités de résistance au moment de membrures avec support latéral pour les Classes 2 et 3 : lorsque le profil traverse une limite de Classe 2, sa capacité calculée chute en fonction du rapport au module de section plastique. Cet effet est sensiblement mineur pour la flexion de l'axe fort, mais il est important pour la flexion de l'axe faible. Une théorie rationnelle pour expliquer les phénomènes de transition entre les deux classes est présentée et prouve qu'il n'existe aucun intervalle de capacité portante. Une formule de conception améliorée pour palier ce problème est présentée.Mots-clés : flexion, classe, bride, flambement, poutres d'acier, axe fort, axe faible.[Traduit par la rédaction]

Document Type: Research article

Publication date: 2007-04-01

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• Published since 1974, this monthly publication is the official journal of the Canadian Society for Civil Engineering. It contains articles on environmental engineering, hydrotechnical engineering, structure engineering, construction engineering, engineering mechanics, and engineering materials, and a history of civil engineering. Contributors include recognized researchers and practitioners in industry, government, and academe. New developments in engineering design and construction are also featured.
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