8 April 2010 Health monitoring of concrete piles using piezoceramic-based smart aggregates
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Abstract
Concrete piles are widely used in the construction of civil infrastructures and it is important to perform the health monitoring of concrete piles for safety purposes. In this paper, a piezoceramic-based innovative approach is proposed for the damage detection and health monitoring of concrete piles. A multi-functional piezoceramic-based transducer device, the smart aggregate, is developed for health monitoring purposes. An active-sensing network is formed by embedding the proposed smart aggregates at the pre-determined locations in the concrete piles before casting. In the proposed approach, one smart aggregate is used as an actuator to excite the desired waves and the other distributed smart aggregates are used as sensors to detect the wave responses. An energy distribution vector is formed based on the wavelet-packet analysis results of sensor signals. A damage index is formed by comparing the difference between the energy distribution vectors of the health concrete pile and that of the damaged concrete pile. To verify the effectiveness of the proposed approach, two concrete piles instrumented with smart aggregates are used as testing objects. One concrete pile is intact and the other has a man-made crack in the middle of the pile. Experimental results show that the there are differences between the energy distribution vectors of the damaged pile and that of the intact pile due to the existence of the crack. The proposed method has the potential to be applied to perform automated integrity inspections for new piles and for the long-term health monitoring of piles in services.
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Gangbing Song, Haichang Gu, Y. L. Mo, Ruoling Wang, "Health monitoring of concrete piles using piezoceramic-based smart aggregates", Proc. SPIE 7650, Health Monitoring of Structural and Biological Systems 2010, 76500X (8 April 2010); doi: 10.1117/12.847827; https://doi.org/10.1117/12.847827
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