Reference-Free NDT Technique for Debonding Detection in CFRP-Strengthened RC Structures
Publication: Journal of Structural Engineering
Volume 133, Issue 8
Abstract
This study attempts to develop a real-time debonding monitoring system for carbon fiber-reinforced polymer (CFRP) strengthened structures by continuously inspecting the bonding condition between the CFRP layer and the host structure. The uniqueness of this study is in developing a new concept and theoretical framework of nondestructive testing (NDT) in which debonding is detected without relying on previously obtained baseline data. The proposed reference-free damage diagnosis is achieved based on the concept of time reversal acoustics (TRA). In TRA, an input signal at an excitation point can be reconstructed if the response signal measured at another point is reemitted to the original excitation point after being reversed in the time domain. Examining the deviation of the reconstructed signal from the known initial input signal allows instantaneous identification of damage without requiring a baseline signal representing the undamaged state for comparison. The concept of TRA has been extended to guided wave propagations within the CFRP-strengthened reinforced concrete (RC) beams to improve the detectability of local debonding. Monotonic and fatigue load tests of large-scale CFRP-strengthened RC beams are conducted to demonstrate the potential of the proposed reference-free debonding monitoring system.
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Acknowledgments
This research was supported by an NSF Grant No. CMS-0529208, Pennsylvania Infrastructure Technology Alliance (PITA) program and Smart Infra-Structure Technology Center (SISTeC). The writers would like to thank the CMS Program Manager, Dr. Shi Lui, and the PITA codirector, Professor Cristina Amon for their supports. The writers also like to thank Seung Bum Kim and Dena E. De Iuliis for assisting our experiments. The first author would like to acknowledge the Electric Power National Scholarship Program at the Ministry of Commerce, Industry and Energy (MOCIE) in Gwachon, South Korea. The beam testing was conducted by Andrew Zorn and Benjamin Reeve in the Watkins-Haggart Structural Engineering Laboratory at the University of Pittsburgh.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 133 • Issue 8 • August 2007
Pages: 1080 - 1091
Copyright
© 2007 ASCE.
History
Received: Apr 24, 2006
Accepted: Jan 8, 2007
Published online: Aug 1, 2007
Published in print: Aug 2007
Notes
Note. Associate Editor: Ahmet Emin Aktan
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