Pullout Strength of Steel Pins in Cold-Formed Steel Framing
Publication: Journal of Structural Engineering
Volume 141, Issue 5
Abstract
Steel pins are an attractive and efficient alternative technology to screws when connecting cold-formed steel or other materials to cold-formed steel members. However, unlike screws, pins remain an essentially proprietary connection technology based on manufacturer claims of special pin shank design. As such, current cold-formed steel design standards and specifications do not include provisions for their direct use and designers have no simple, rational means for making informed design decisions beyond information provided by manufacturers. This paper reviews the current design model for screws and examines the basic tension pullout/withdrawal limit state of helical knurled steel pin connections for cold-formed steel thicknesses common in residential construction. Included in this paper is a determination of material properties using a nondestructive test method as an alternative to traditional methods for estimation of steel base metal thickness. A simple lower bound friction model is proposed for helical steel pins and the model is calibrated using data from 32 physical pin tests. The calibrated model is shown to provide an acceptable degree of reliability and safety consistent with that of screws in current cold-formed steel design standards and specifications.
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Acknowledgments
Several companies and individuals provided materials and time for the work reported in this paper, including ET&F framing systems, Clark Dietrich, Nicholas Ramirez and Ernesto Hipolito of CEMCO Engineering Laboratory (CEL), and Michaela Nava, Santa Clara University undergraduate student researcher. Their support is sincerely appreciated.
References
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 141 • Issue 5 • May 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Mar 25, 2013
Accepted: Mar 6, 2014
Published online: Jul 22, 2014
Discussion open until: Dec 22, 2014
Published in print: May 1, 2015
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