Cold-Formed Steel Reinforcement for Improperly Cut Wood Composite I-Joists
Publication: Practice Periodical on Structural Design and Construction
Volume 13, Issue 4
Abstract
Wood composite I-joists have become an attractive option for floor joists in residential construction. One disadvantage of I-joists is the restrictions on hole size and the inability to notch the top compression flange. This technical paper evaluates two cold-formed steel reinforcers to strengthen I-joists that have been improperly cut—one to reinforce the top flange, and another to reinforce the web. The reinforcers were tested at various locations along the length of the beam. Based upon testing results, the notched I-joists with the flange reinforcers retained 60.2% of the strength and 77.0% of the stiffness of the original I-joists. The I-joists with the web hole and single-sided reinforcers retained 78.2%% of the strength and 95.7% of the stiffness of the original I-joists. I-joists with the web hole and the double-sided web reinforcers retained the I-joist strength and 95.1% of the stiffness of the original I-joist. These reductions in strength and stiffness can be used to determine if the reinforced I-joists are suitable for particular loading applications.
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Acknowledgments
The writers would like to acknowledge Metwood, Inc. of Boones Mill, VA for materials and support.
References
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Information
Published In
Practice Periodical on Structural Design and Construction
Volume 13 • Issue 4 • November 2008
Pages: 198 - 203
Copyright
© 2008 ASCE.
History
Received: Dec 13, 2007
Accepted: Feb 1, 2008
Published online: Nov 1, 2008
Published in print: Nov 2008
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