Effects of FRP-Concrete Interface Bond Properties on the Performance of RC Beams Strengthened in Flexure with Externally Bonded FRP Sheets
Publication: Journal of Materials in Civil Engineering
Volume 18, Issue 5
Abstract
Fiber reinforced polymer (FRP) sheets have been increasingly used as externally bonded reinforcements in the rehabilitation of concrete structures. The efficacy of the FRP bonding technology highly depends on the bond integrity between the FRP sheets and the concrete. The bond performance may directly influence the cracking of the concrete, whereas the presence of concrete cracks would impair the bond between the FRP sheets and the concrete. This paper aims to clarify the effect of interface bond properties on the performance of FRP-strengthened reinforced concrete (RC) beams in terms of concrete cracking, interface stress transfer, and failure mechanisms using nonlinear fracture mechanics based finite element analyses. To represent the typical crack patterns and capture the local interaction between FRP debonding and concrete cracking, a specially designed structural model with uniformly distributed cracking is used within the frame of the discrete crack approach. A detailed parametric study is performed to investigate the effects of interface bond properties in terms of stiffness, strength, fracture energy (or toughness), and bond curve shape. It is concluded that bond fracture energy (or toughness) is the main parameter influencing the structural strength and ductility. This study may serve as a valuable reference for optimization of the FRP-concrete bond interface in practical applications.
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Acknowledgments
The partial financial supports from the National High Technology Research and Development Program of China (863 Program) under Grant No. 2001AA336010 and the Joint Research Fund for Overseas Chinese Young Scholars of National Natural Science Foundation of China (Grant No. NNSFC50228808) are gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 18 • Issue 5 • October 2006
Pages: 723 - 731
Copyright
© 2006 ASCE.
History
Received: Oct 11, 2004
Accepted: Jan 9, 2006
Published online: Oct 1, 2006
Published in print: Oct 2006
Notes
Note. Associate Editor: Laura De Lorenzis
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