Hybrid FRP Strengthening of Slender Steel Members for Buckling Control
Publication: Journal of Composites for Construction
Volume 24, Issue 5
Abstract
In this paper, the structural properties and behavior of slender steel members strengthened against buckling by a hybrid system of fiber-reinforced polymer (FRP) shells filled with self-consolidating grout (SCG), in the form of buckling restrained bracing (BRB), were investigated. The goal of the hybrid system is to increase the load-carrying capacity of the slender member to reach the yielding load of the steel core through the addition of lateral support. A total of 36 small-scale specimens (27 strengthened specimens and 9 plain 25.4 mm × 6.35 mm steel cores) were prepared and tested in compression. Strengthened specimens were prepared with three different FRP shell lengths (300, 600, and 900 mm) and three outer shell diameters (41, 53, and 65 mm). A lubricant was applied to the steel core to allow the steel core to carry the majority of the axial load independently. The contribution of each component of the hybrid system to the overall load-carrying capacity was also calculated. The steel core was found to carry on average 86% of the load at yielding, with the grout and FRP carrying only 13.5% and 0.5%, respectively. A simple linear elastic model was created to predict the failure mode of the hybrid system that can also be used to design an optimized system. The model accurately predicted the failure mode for all 27 reinforced specimens. Overall, provided the hybrid FRP-strengthening system was sufficiently sized, the system was successful in changing the failure mode of the steel core from buckling to yielding.
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Acknowledgments
The author acknowledges the financial support of Dalhousie University, the Nova Scotia Graduate Scholarship (NSGS), and the National Sciences and Engineering Research Council of Canada (NSERC). This project would not have been possible without the help of lab technicians Blair Nickerson, Brian Kennedy, Jesse Keane, and Jordan Maerz of Dalhousie University. The author also acknowledges QuakeWrap Inc. (Tucson, AZ, USA) for providing GFRP laminate and adhesive for the experimental program.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 24 • Issue 5 • October 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Apr 19, 2019
Accepted: Mar 31, 2020
Published online: Jun 18, 2020
Published in print: Oct 1, 2020
Discussion open until: Nov 18, 2020
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