Behavior of CFRP-Prestressed Concrete Beams under High-Cycle Fatigue at Low Temperature
Publication: Journal of Composites for Construction
Volume 15, Issue 4
Abstract
This paper investigates the behavior of concrete beams prestressed with carbon fiber-reinforced polymer (CFRP) rods under high-cycle fatigue at low temperature. Seven precast T-beams were tested, including five beams prestressed to various levels with the CFRP rods and two beams with conventional steel strands. All beams had a history of sustained loading. Some beams were directly loaded monotonically to failure as control specimens. Other beams were subjected to three million cycles of flexural loading, either at room temperature or at , prior to being monotonically loaded to failure at the same temperature. All CFRP-prestressed beams survived the three million cycles, whereas the steel-prestressed beam did not. It was shown, however, that the bond between CFRP rods and concrete could be weakened because of cyclic loading, low temperature during loading, or high prestress level. This resulted in a premature bond failure at 70 to 90% of the full flexural strength in subsequent monotonic loading. Also, stiffness and camber gradually decreased during cyclic loading.
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Acknowledgments
The authors are indebted to Professor Khaled Soudki (University of Waterloo, Canada) for designing the beams used in this study and to Pre-Con Ltd. and Mr. Floyd Clapp (former Plant Manager, Belleville, Ontario) for fabricating the beams. Funding from Queen’s University, Bombardier, and Canada’s Natural Sciences and Engineering Research Council of Canada (NSERC), Research Chairs and Mathematics of Information Technology and Complex Systems (MITACS) Accelerate Program is also appreciated. The experimental work in this paper would not have been possible without the excellent support of technical staff at Queen’s University, especially Dave Tryon, Neil Porter, and Paul Thrasher.
References
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 15 • Issue 4 • August 2011
Pages: 482 - 489
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Apr 17, 2010
Accepted: Aug 16, 2010
Published online: Nov 1, 2010
Published in print: Aug 1, 2011
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