Fatigue Behavior of RC Beams Strengthened with NSM CFRP Rods
Publication: Journal of Composites for Construction
Volume 13, Issue 5
Abstract
This paper presents experimental results of reinforced concrete beams strengthened using near-surface mounted (NSM) carbon fiber-reinforced polymer (CFRP) reinforcement. A total of nine beam specimens were tested under fatigue loads. In addition, two specimens were tested for monotonic capacity. The beams were 3,500 mm long with a cross section of 254 mm deep by 152 mm wide. Different load ranges were considered in the fatigue tests to construct the fatigue life curves. The test results showed that under monotonic loading, the beam strengthened with NSM CFRP rod exhibited increases of 26 and 50% in the yield and ultimate load over the control beam, respectively. Under cyclic loading, the fatigue life for the strengthened beams was 24% higher than that of the control unstrengthened beams. An analytical model using sectional analysis and strain-life approach was developed to estimate the fatigue life of the specimens at various cyclic load ranges. A good agreement between the experimental results and analytical prediction of the fatigue life was obtained.
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Acknowledgments
The research was conducted with the support by UNSPECIFIEDSaudi Cultural Bureau and NSERC. Special thanks are extended to Professor T. Topper for his help with the fatigue analysis.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 13 • Issue 5 • October 2009
Pages: 415 - 421
Copyright
© 2009 ASCE.
History
Received: Apr 2, 2007
Accepted: May 7, 2009
Published online: Sep 15, 2009
Published in print: Oct 2009
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