Experimental Research on Fatigue Behavior of RC Beams Strengthened with Steel Plate-Concrete Composite Technique
Publication: Journal of Structural Engineering
Volume 137, Issue 7
Abstract
Based on fatigue experiments on eight reinforced concrete (RC) beams strengthened with the steel plate-concrete composite (SPCC) technique, the fatigue life and development trend of stiffness and strain of specimens under a constant amplitude fatigue loading were studied. The experimental results showed that the fatigue failure mode of the SPCC strengthened beams was the fatigue failure of the steel plate. The initial fatigue crack in the steel plate appeared near the weld toe of studs and then expanded through the plate. Unlike regular RC beams, the fatigue failure mode of the tested specimens was ductile. The amplitude of stress in the steel plate had the most important influence on the fatigue behavior of RC beams strengthened with the SPCC technique. The level and amplitude of stress in the steel plate should be strictly controlled in practical design, and therefore, the high-strength steel and thin steel plate were not suitable for RC beams strengthened with the SPCC technique. The prestress in the steel plate could improve the fatigue life of RC beams strengthened with the SPCC technique. The S-N curve of the tension steel plate, welded with studs specified in the British code of practice for bridge design, BS5400, was conservative for the design of steel plate in RC beams strengthened with the SPCC technique. Calculation models were presented of the residual static capacity and stiffness of RC beams strengthened with the SPCC technique after fatigue failure.
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Acknowledgments
The writers gratefully acknowledge the financial support provided by the National Science Fund of China (NSFC#50578084 and NSFC#50828803) and the project (NSFC#2006G029) supported by China Railway Ministry.
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Information
Published In
Journal of Structural Engineering
Volume 137 • Issue 7 • July 2011
Pages: 772 - 781
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Dec 6, 2009
Accepted: Oct 18, 2010
Published online: Oct 21, 2010
Published in print: Jul 1, 2011
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