Design of cold-formed compression web members with periodically varying section properties

Authors: Parent, Serge; Pote, Joseph J.; Neale, Kenneth W.

Source: Canadian Journal of Civil Engineering, Volume 34, Number 2, February 2007 , pp. 253-265(13)

Publisher: NRC Research Press

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Abstract:

In this paper, a design procedure for cold-formed channels periodically closed on their open face and utilized as joist web members is detailed. The design method for periodically closed sections is based on the representation of the cross-sectional properties using Fourier series introduced in Timoshenko quotients for the determination of the buckling loads about each of the three member axes. Once those loads are computed, they are used in the current framework of the North American Specification for the design of cold-formed structures with appropriate effective length coefficients. The proposed design methodology is compared with test results obtained from 36 stub column samples and 21 full-scale joist specimens, also presented in this paper.Key words: cold-formed struts, periodically varying cross sections, steel joists, flexural-torsional buckling, effective length coefficients.

Dans cet article, une méthode appliquée à la conception de membrures d'âme pour poutrelles d'acier employant des profilés en C formés à froid avec leur face ouverte périodiquement fermée est présentée. La procédure proposée est basée sur la représentation par séries de Fourier des propriétés géométriques variant périodiquement le long de la membrure. Ces séries sont par la suite introduites dans des quotients de Timoshenko utilisés pour la détermination des charges de flambement suivant les trois axes de la membrure. Une fois évaluées, ces charges servent à la détermination de la charge nominale de flambement, tel que décrite par la norme canadienne de conception des pièces structurales formées à froid en considérant des coefficients d'élancement appropriés. La méthodologie proposée est comparée avec les résultats obtenus à partir de 36 tests sur composantes individuelles, ainsi que 21 essais sur poutrelles pleine grandeur présentés dans cet article.Mots-clés : pièces comprimées, formé à froid, géométrie variant périodiquement, poutrelles d'acier, flambement en flexion-torsion, coefficients de longueur effective.

Document Type: Research article

Publication date: 2007-02-01

More about this publication?
  • 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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