Impedance-based Damage Detection for Civil Infrastructures

The objective of this study is to investigate the feasibility of an impedance-based damage detection technique using piezoelectric (PZT) transducers for civil infrastructures such as steel bridges. The basic concept of the technique is to monitor the changes in the electrical impedance to detect structural damages. Those changes in the electrical impedance are due to the electro-mechanical coupling property of piezoelectric materials and the host structure. In this study, at first, a numerical analysis was performed to understand the basics of this technique through a simple 1-D electro-mechanical system. The experimental studies on three kinds of structural members were carried out to detect the locations of cracks and loosened bolts. It was that cracks or loosened bolts near the PZT sensors could be effectively detected by monitoring the shifts of the resonant frequencies of the impedance functions.
Publisher
Springer Verlag (Germany)
Issue Date
2004-07
Keywords

civil infrastructures; damage detection; electro-mechanical impedance; PZT transducer; shifts of resonant frequencies; structural health monitoring

Citation

KSCE Journal of Civil Engineering, Vol.8, No.4, pp.425-433

ISSN
1226-7988
DOI
10.1007/BF02829166
URI
http://hdl.handle.net/10203/14831
Appears in Collection
CE-Journal Papers(저널논문)
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