Enhancing Local Buckling Behavior of SHS Braces Using GFRP and CFRP Wrap
Publication: Journal of Composites for Construction
Volume 22, Issue 5
Abstract
During earthquakes, diagonal members of concentrically braced frames are meant to dissipate hysteretic energy through their postbuckling performance. However, crack formation at the location of plastic hinges obstructs the brace operation. This paper proposes the use of fiber-reinforced polymer (FRP)—both glass fiber–reinforced polymer (GFRP) and carbon fiber–reinforced polymer (CFRP)—to improve the behavior of square hollow section (SHS) braces, and this retrofitting strategy is selected in a way to mitigate the local buckling which plays a key role in the failure of braces. The effectiveness of the proposed approach is validated using an experimental program, and the strengthening specimens are tested under axial compressive loading. The influence of parameters—including the slenderness ratio, the number of FRP layers, and the FRP length—is evaluated. Results indicate that the externally overwrapped FRP fabrics in the transverse direction are highly capable of postponing the local buckling, and the strengthening does not noticeably increase the axial strength of braces. Furthermore, a numerical model using ABAQUS software is developed to extend the experimental results for further studies after verification.
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Acknowledgments
The authors would acknowledge the AUT Structural Laboratory at Amirkabir University of Technology for providing experimental facilities.
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Published In
Journal of Composites for Construction
Volume 22 • Issue 5 • October 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Oct 24, 2016
Accepted: Jan 24, 2018
Published online: Jun 29, 2018
Published in print: Oct 1, 2018
Discussion open until: Nov 29, 2018
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