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Structural Monitoring and Maintenance Volume 4, Number 3, September 2017 , pages 237-253 DOI: https://doi.org/10.12989/smm.2017.4.3.237 |
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Experimental investigation of magnetic-mount PZT-interface for impedance-based damage detection in steel girder connection |
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Joo-Young Ryu, Thanh-Canh Huynh and Jeong-Tae Kim
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| Abstract | ||
| Among various structural health monitoring technologies, impedance-based damage detection has been recognized as a promising tool for diagnosing critical members of civil structures. Since the piezoelectric transducers used in the impedance-based technique should be bonded to the surface of the structure using bonding layers (e.g., epoxy layer), it is hard to maintain the as-built condition of the bonding layers and to reconfigure the devices if needed. This study presents an experimental investigation by using magnetically attached PZT-interface for the impedance-based damage detection in bolted girder connections. Firstly, the principle of the impedance-based damage detection via the PZT-interface device is outlined. Secondly, a PZT-interface attachment method in which permanent magnets are used to replace the conventional bonding layers is proposed. Finally, the use of the magnetic attraction for the PZT-interface is experimentally evaluated via detecting the bolt-loosening events in a bolted girder connection. Also, the sensitivity of impedance signatures obtained from the PZT-interface is analyzed with regard to the interface\'s material. | ||
| Key Words | ||
| magnetic-mount; electromechanical impedance; PZT interface; bolted connection; impedance-based damage detection | ||
| Address | ||
| Joo-Young Ryu, Thanh-Canh Huynh and Jeong-Tae Kim: Department of Ocean Engineering, Pukyong National University, 599-1 Daeyon-3dong, Nam-gu, Busan 608-737, Republic of Korea | ||
