Active Debonding Detection for Large Rectangular CFSTs Based on Wavelet Packet Energy Spectrum with Piezoceramics
Publication: Journal of Structural Engineering
Volume 139, Issue 9
Abstract
The debonding between the steel tube and the confined concrete core of concrete-filled steel tubes (CFSTs) can weaken the confinement effect of the steel tube on the concrete core and may induce a decrease in the load-carrying capacity and in the ductility. The debonding detection technique for CFSTs is still a challenging problem resulting from the inaccessibility and invisibility of the interface. In this paper, by embedding piezoelectric lead zirconate titanate (PZT) based functional smart aggregates (SAs) in concrete core as actuators and pasting PZT patches on the predetermined locations of the outer surfaces of the specimen as sensors, a novel active interface condition monitoring approach for rectangular CFST members is proposed and is experimentally validated with a scale rectangular CFST specimen with artificial debonding defects. Analysis of the wavelet packet energy spectrum (WPES) of the measurements of PZT patches is carried out, and a damage index, called the weighted variation of WPES (WVWPES) is defined to detect the artificial debonding regions. The results show that the proposed WVWPES index is sensitive to the debonding defect. Finally, the proposed approach is applied to evaluate the interface condition of a large rectangular CFST column of a super high-rise building.
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Acknowledgments
The authors gratefully acknowledge the support provided by the National Natural Science Foundation of China (NSFC) under Grant No. 51278185 and the Program for New Century Excellent Talents in University (NCET-08-0178). The partial support by National Science Foundation (Award No. 0724190) in conducting this research is also greatly appreciated.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 139 • Issue 9 • September 2013
Pages: 1435 - 1443
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jul 9, 2011
Accepted: Jul 20, 2012
Published online: Aug 10, 2012
Published in print: Sep 1, 2013
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