Prestress Losses and Flexural Behavior of Reinforced Concrete Beams Strengthened with Posttensioned CFRP Sheets
Publication: Journal of Composites for Construction
Volume 16, Issue 2
Abstract
An experimental study was conducted to investigate the flexural behavior and long-term prestress losses of reinforced concrete (RC) beams strengthened with posttensioned carbon fiber-reinforced polymer (CFRP) sheets. The experimental program consisted of tensile tests of flat CFRP coupons under sustained loads and flexural tests of a total of eight RC beams: six strengthened with posttensioned CFRP sheets, one strengthened with nonprestressed CFRP sheets, and one control beam. The main objective of the tests was to gain a better understanding of the long-term prestress losses of CFRP sheets in the posttensioned system under different prestress levels and strengthening ratios. It is shown that the prestress losses of CFRP sheets in the posttension system are mainly attributable to anchorage set (approximately 12.6 to 18.2% of the initial prestress), whereas the time-dependent losses caused by creep and shrinkage of concrete and relaxation of CFRP sheets are relatively small (approximately 2.3 to 3.9% of the initial prestress).
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the National Nature Science Foundation of China (Project code: 51078079). In addition, the authors wish to thank the University of Pittsburgh for the opportunity for research collaboration.
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Published In
Journal of Composites for Construction
Volume 16 • Issue 2 • April 2012
Pages: 207 - 216
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Jun 14, 2011
Accepted: Sep 21, 2011
Published online: Sep 23, 2011
Published in print: Apr 1, 2012
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