Effect of Prestressing Level on the Time-Dependent Behavior of GFRP Prestressed Concrete Beams
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Volume 21, Issue 4
Abstract
The use of fiber-reinforced polymers (FRPs) has become common in many civil engineering applications, including prestressing applications. Glass FRP (GFRP) bars are less expensive than carbon FRP (CFRP) bars, but they have high relaxation properties and are susceptible to creep rupture, which has limited their use in prestressed applications. A new generation of GFRP bars has been recently manufactured with improved mechanical properties that make them suitable for prestressed applications. Much research has been conducted on the short-term behavior of concrete members prestressed/reinforced with GFRP tendons, but relatively little is known about the long-term behavior of these members. This paper presents the results of testing 12 beams as part of an ongoing program to investigate the long-term behavior of GFRP prestressed concrete beams. Three beams were tested to failure in a monotonic four-point loading test, and nine beams were subjected to sustained loading for 300 days. The results showed that the sustained loading for 300 days did not affect the beams’ ultimate capacity, which suggests that creep or relaxation of the GFRP bars was not significant and did not affect the strength of the beams. It was concluded that the prestressing decreased the total and long-term midspan deflection and the total and the long-term concrete strains, mainly at the lower sustained load levels.
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Acknowledgments
This paper is dedicated to the memory of Professor Khaled Soudki, a distinguished researcher in the use of FRP in concrete structures. He leaves behind a worldwide legacy of research and will always be remembered for his contributions to civil engineering. The authors thank Schoeck-Canada and the Natural Sciences and Research Council of Canada NSERC for funding the project, and Hogg Ready Mix for providing the concrete used in this study.
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Journal of Composites for Construction
Volume 21 • Issue 4 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Apr 12, 2016
Accepted: Oct 10, 2016
Published ahead of print: Jan 16, 2017
Published online: Jan 17, 2017
Discussion open until: Jun 17, 2017
Published in print: Aug 1, 2017
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