Development of Acceleration-PZT Impedance Hybrid Sensor Nodes Embedding Damage Identification Algorithm for PSC Girders

J. Ocean Eng. Technol. 2010;24(3):1-10.

Park Jae-Hyung,Lee So-Young,Kim Jeong-Tae

Department of Ocean Engineering Pukyong National University,Department of Ocean Engineering Pukyong National University,Department of Ocean Engineering Pukyong National University

Keywords: Prestressed concrete girder, Acceleration, Impedance, Hybrid Sensor node, Embedded system, Damage identification

Abstract

In this study, hybrid smart sensor nodes were developed for the autonomous structural health monitoring of prestressed concrete (PSC) girders. In order to achieve the objective, the following approaches were implemented. First, we show how two types of smart sensor nodes for the hybrid health monitoring were developed. One was an acceleration-based smart sensor node using an MEMS accelerometer to monitor the overall damage in concrete girders. The other was an impedance-based smart sensor node for monitoring the local damage in prestressing tendons. Second, a hybrid monitoring algorithm using these smart sensor nodes is proposed for the autonomous structural health monitoring of PSC girders. Finally, we show how the performance of the developed system was evaluated using a lab-scaled PSC girder model for which dynamic tests were performed on a series of prestress-loss cases and girder damage cases.