Retrofitting Actual-Size Precracked Precast Prestressed Concrete Double-Tee Girders Using Externally Bonded CFRP Sheets
Publication: Journal of Performance of Constructed Facilities
Volume 30, Issue 2
Abstract
Precast prestressed double-tee (DT) girders are considered a crucial element of modern infrastructure used to accelerate building construction worldwide. These girders can be deficient because of local damages and develop cracks as a result of improper transportation and handling. Therefore, it is very important to develop an efficient retrofitting technique in order to restore the lost capacity and/or even outperform it. The objective of this paper is to develop retrofit strategy of the deficient girders using the externally bonded carbon-fiber-reinforced polymer (EB-CFRP) technique and verify it using field data. A field test was conducted on three actual-size precast pretensioned DT girders having different levels of damage and retrofitted using CFFP sheets. The girder stems for two of them were strengthened in flexure using unidirectional U-shaped CFRP sheets, while all girders were shear-strengthened at their dapped ends. Each girder was loaded incrementally up to collapse while the deflection of the girder and normal strains developed on both concrete surface and the CFRP sheets were recorded at each load increment. Test results assured the adequacy of the adopted strengthening technique with respect to both ultimate capacity and ductility. In addition, the experimental flexural and shear resistances of the retrofitted girders are far greater than those obtained from equations available in design codes by at least 60%.
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Acknowledgments
This research was made possible by funding from Prestressed System Inc., Windsor, Ontario, Canada; Toronto District School Board, Toronto; and Materials and Manufacturing of Ontario Center of Excellence. The in-kind contribution in the form of CFRP sheets and adhesives from RJ Watson Inc. of New York and Fyfe Co. LLC The Fibrwrap Company of San Diego is greatly appreciated. Special thanks to Kaneff Development Inc. of Brampton, Canada, for providing the off-campus site for testing. Special thanks to Mr. Daniel Peneff, the senior technical officer of Ryerson University, for facilitating the field test site.
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Journal of Performance of Constructed Facilities
Volume 30 • Issue 2 • April 2016
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© 2015 American Society of Civil Engineers.
History
Received: Jun 30, 2014
Accepted: Feb 12, 2015
Published online: Apr 1, 2015
Discussion open until: Sep 1, 2015
Published in print: Apr 1, 2016
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