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Wireless Impedance Sensor with PZT-Interface for Prestress-Loss Monitoring in Prestressed Concrete Girder  

Nguyen, Khac-Duy (Department of Ocean Engineering, Pukyong National University)
Lee, So-Young (Department of Ocean Engineering, Pukyong National University)
Kim, Jeong-Tae (Department of Ocean Engineering, Pukyong National University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.31, no.6, 2011 , pp. 616-625 More about this Journal
Abstract
Ensuring the designed prestress force is very important for the safety of prestressed concrete bridge. The loss of prestress force in tendon could significantly reduce load carrying capacity of the structure. In this study, an automated prestress-loss monitoring system for prestressed concrete girder using PZT-interface and wireless impedance sensor node is presented. The following approaches are carried out to achieve the objective. Firstly, wireless impedance sensor nodes are designed for automated impedance-based monitoring technique. The sensor node is mounted on the high-performance Imote2 sensor platform to fulfill high operating speed, low power requirement and large storage memory. Secondly, a smart PZT-interface designed for monitoring prestress force is described. A linear regression model is established to predict prestress-loss. Finally, a system of the PZT-interface interacted with the wireless sensor node is evaluated from a lab-scale tendon-anchorage connection of a prestressed concrete girder.
Keywords
Prestress-Loss; Automated Monitoring; Imote2; Impedance Sensor Node; PZT-Interface; Prestressed Concrete Girder;
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Times Cited By KSCI : 5  (Citation Analysis)
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