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Mathematical Problems in Engineering
Volume 2014, Article ID 784731, 11 pages
Research Article

Impedance-Based Cable Force Monitoring in Tendon-Anchorage Using Portable PZT-Interface Technique

Department of Ocean Engineering, Pukyong National University, Daeyeon-dong, Nam-gu, Busan 608-737, Republic of Korea

Received 30 December 2013; Accepted 5 March 2014; Published 30 March 2014

Academic Editor: Ting-Hua Yi

Copyright © 2014 Thanh-Canh Huynh and Jeong-Tae Kim. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In this paper, a portable PZT interface for tension force monitoring in the cable-anchorage subsystem is developed. Firstly, the theoretical background of the impedance-based method is presented. A few damage evaluation approaches are outlined to quantify the variation of impedance signatures. Secondly, a portable PZT interface is designed to monitor impedance signatures from the cable-anchorage subsystem. One degree-of-freedom analytical model of the PZT interface is established to explain how to represent the loss of cable force from the change in the electromechanical impedance of the PZT interface as well as reducing the sensitive frequency band by implementing the interface device. Finally, the applicability of the proposed PZT-interface technique is experimentally evaluated for cable force-loss monitoring in a lab-scaled test structure.