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Sensors 2014, 14(10), 19897-19909; doi:10.3390/s141019897

A Study of Concrete Slab Damage Detection Based on the Electromechanical Impedance Method

1
School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
2
Department of Architecture and Materials, Hubei University of Education, Wuhan 430205, China
*
Author to whom correspondence should be addressed.
Received: 11 August 2014 / Revised: 23 September 2014 / Accepted: 11 October 2014 / Published: 23 October 2014
(This article belongs to the Section Physical Sensors)
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Abstract

Piezoelectric lead zirconate titanate (PZT) is being gradually applied into practice as a new intelligent material for structural health monitoring. In order to study the damage detection properties of PZT on concrete slabs, simply supported reinforced concrete slabs with piezoelectric patches attached to their surfaces were chosen as the research objects and the Electromechanical Impedance method (EMI) was adopted for research. Five kinds of damage condition were designed to test the impedance values at different frequency bands. Consistent rules are found by calculation and analysis. Both the root mean square deviation (RMSD) and the correlation coefficient deviation (CCD) damage indices are capable of detecting the structural damage. The newly proposed damage index Ry/Rx can also predict the changes well. The numerical and experimental studies verify that the Electromechanical Impedance method can accurately predict changes in the amount of damage in reinforced concrete slabs. The damage index changes regularly with the distance of damages to the sensor. This relationship can be used to determine the damage location. The newly proposed damage index Ry/Rx is accurate in determining the damage location. View Full-Text
Keywords: PZT; Electromechanical Impedance method; damage index; reinforced concrete slab; damage detection PZT; Electromechanical Impedance method; damage index; reinforced concrete slab; damage detection
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. (CC BY 4.0).

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Hu, X.; Zhu, H.; Wang, D. A Study of Concrete Slab Damage Detection Based on the Electromechanical Impedance Method. Sensors 2014, 14, 19897-19909.

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