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Sensors 2010, 10(12), 11644-11661;

Sub-Frequency Interval Approach in Electromechanical Impedance Technique for Concrete Structure Health Monitoring

School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
Author to whom correspondence should be addressed.
Received: 21 October 2010 / Revised: 8 December 2010 / Accepted: 14 December 2010 / Published: 21 December 2010
(This article belongs to the Special Issue Advanced Sensing Technology for Nondestructive Evaluation)
Full-Text   |   PDF [2328 KB, uploaded 21 June 2014]


The electromechanical (EM) impedance technique using piezoelectric lead zirconate titanate (PZT) transducers for structural health monitoring (SHM) has attracted considerable attention in various engineering fields. In the conventional EM impedance technique, the EM admittance of a PZT transducer is used as a damage indicator. Statistical analysis methods such as root mean square deviation (RMSD) have been employed to associate the damage level with the changes in the EM admittance signatures, but it is difficult to determine the location of damage using such methods. This paper proposes a new approach by dividing the large frequency (30–400 kHz) range into sub-frequency intervals and calculating their respective RMSD values. The RMSD of the sub-frequency intervals (RMSD-S) will be used to study the severity and location of damage. An experiment is carried out on a real size concrete structure subjected to artificial damage. It is observed that damage close to the PZT changes the high frequency range RMSD-S significantly, while the damage far away from the PZT changes the RMSD-S in the low frequency range significantly. The relationship between the frequency range and the PZT sensing region is also presented. Finally, a damage identification scheme is proposed to estimate the location and severity of damage in concrete structures. View Full-Text
Keywords: piezoelectric; Electromechanical Impedance (EMI); concrete; Structural Health Monitoring (SHM) piezoelectric; Electromechanical Impedance (EMI); concrete; Structural Health Monitoring (SHM)
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Yang, Y.; Divsholi, B.S. Sub-Frequency Interval Approach in Electromechanical Impedance Technique for Concrete Structure Health Monitoring. Sensors 2010, 10, 11644-11661.

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