Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/21289
Title: Prestress losses and flexural behavior of reinforced concrete beams strengthened with posttensioned CFRP sheets
Authors: Wang, WW
Dai, JG 
Harries, KA
Bao, QH
Keywords: CFRP
Posttensioned
Prestress loss
Reinforced concrete beams
Sheets
Strengthening
Issue Date: 2012
Publisher: American Society of Civil Engineers
Source: Journal of composites for construction, 2012, v. 16, no. 2, p. 207-216 How to cite?
Journal: Journal of composites for construction 
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).
URI: http://hdl.handle.net/10397/21289
ISSN: 1090-0268
EISSN: 1943-5614
DOI: 10.1061/(ASCE)CC.1943-5614.0000255
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