The effects of web holes on web crippling strength of cold-formed steel channels under end-two-flange loading condition

Uzzaman, Asraf and Lim, James B. P. and Nash, David and Rhodes, James and Young, Ben (2012) The effects of web holes on web crippling strength of cold-formed steel channels under end-two-flange loading condition. In: 21st Specialty Conference on Cold-Formed Steel Structures, 2012-10-24 - 2012-10-25, St Louis, Missouri.

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Abstract

Cold-formed steel sections are often used as wall studs or floor joists; such sections often include web holes for ease of installation of the services. Web crippling at points of concentrated, or localised, load or reaction in thin-walled beams is well known to be a significant problem, particularly in the case of beams with slender webs, and is of high importance in the field of cold-formed steel members, as such members are generally not stiffened against this type of loading. In this paper, a combination of experimental tests and non-linear elasto-plastic finite element analyses are used to investigate the effect of such holes on web crippling under end-two-flange (ETF) loading condition. In the case of the tests with web openings, the web holes located at the mid-depth of the webs. A non-linear elasto-plastic finite element model is developed in this study, and the results compared against the laboratory test results; a good agreement was obtained in terms of both strength and failure modes.

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