Flexural Behavior of CFST Beams Partially Strengthened with Unidirectional CFRP Sheets: Experimental and Theoretical Study
Publication: Journal of Composites for Construction
Volume 22, Issue 4
Abstract
The performance of simply supported concrete-filled steel tube (CFST) beams strengthened with unidirectional carbon fiber–reinforced polymer (CFRP) sheets was investigated. Twelve circular and rectangular beams were tested under flexure. Different CFRP strengthening configurations were investigated. In addition, a nonlinear finite-element (FE) analysis was performed to investigate the influence of different design parameters. The results show that the CFRP sheets significantly improved the moment capacity, flexural stiffness, and energy absorption (EA) capacity of the CFST beams. For example, the moment capacity and the EA capacity of circular beams increased by up to 38 and 18%, respectively, depending on the strengthening configuration. The strengthening scheme consisting of CFRP sheets applied on two sides for 75% of the beam length resulted in a similar strength enhancement compared with CFRP sheets applied along the entire beam length. Based on the results of the FE analysis, an empirical method was developed to predict the moment capacity of the CFST beams that were strengthened with CFRP sheets.
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Acknowledgments
The authors gratefully acknowledge the financial support for this research provided by the Universiti Kebangsaan Malaysia (Grant No. DLP-2014-001). Special thanks to Dr. Mojtaba Porhemmat and Dr. Emad Hosseinpour for their great assistance in the experimental works of this research.
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Published In
Journal of Composites for Construction
Volume 22 • Issue 4 • August 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Nov 1, 2016
Accepted: Feb 1, 2018
Published online: May 26, 2018
Published in print: Aug 1, 2018
Discussion open until: Oct 26, 2018
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