15 April 2016 Impedance monitoring at tendon-anchorage via mountable PZT interface and temperature-effect compensation
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In this study, the pre-stress force in pre-stressed concrete (PSC) girders is monitored via mountable PZT interface under varying temperature. Firstly, an impedance-based technique using mountable PZT interface is proposed for pre-stress-loss monitoring in tendon-anchorage systems. A cross correlation-based temperature-effect compensation algorithm using an effective frequency shift (EFS) of impedance signatures is visited. Secondly, lab-scale experiments are performed on a PSC girder instrumented with a mountable PZT interface at tendon-anchorage. A series of temperature variation and pre-stress-loss events are simulated for the lab-scale PSC girder. Thirdly, the feasibility of the mountable PZT interface for pre-stress-loss monitoring in tendon-anchorage is experimentally verified under constant temperature conditions. Finally, the PZT interface device is examined for pre-stress-loss monitoring under temperature changes to validate its applicability. The temperature effect on impedance signatures is compensated by minimizing cross-correlation deviation between impedance patterns of the mountable PZT interface.
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Thanh-Canh Huynh, Thanh-Canh Huynh, Tuan-Cuong Nguyen, Tuan-Cuong Nguyen, Sang-Hoon Choi, Sang-Hoon Choi, Jeong-Tae Kim, Jeong-Tae Kim, "Impedance monitoring at tendon-anchorage via mountable PZT interface and temperature-effect compensation", Proc. SPIE 9799, Active and Passive Smart Structures and Integrated Systems 2016, 97990A (15 April 2016); doi: 10.1117/12.2218969; https://doi.org/10.1117/12.2218969

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