Damage detection in concrete structures with smart piezoceramic transducers

Akshay Surendra Kumar Naidu; Suresh Bhalla

doi:10.1117/12.514900

14 October 2003 Damage detection in concrete structures with smart piezoceramic transducers

Akshay Surendra Kumar Naidu, Suresh Bhalla

Proceedings Volume 5062, Smart Materials, Structures, and Systems; (2003) https://doi.org/10.1117/12.514900
Event: Smart Materials, Structures, and Systems, 2002, Bangalore, India

Abstract

Detection of damages and progressive deterioration in structures is a critical issue. Visual inspections are tedious and unreliable. Incipient damages are often not discernible by low frequency dynamic response and other NDE techniques. Smart piezoelectric ceramic (PZT) transducers are emerging as an effective alternative in health monitoring of structures. The electro-mechanical impedance method employs the self-actuating and sensing characteristics of the PZT, without having to use actuators and sensors separately. When excited by an ac source, the PZT transducers bonded to the host structure activates the higher modes of vibration locally. Changes in the admittance response of the transducer serves as an indicator of damage around the transducer. In this paper, the effectiveness of PZT transducers for characterizing damages in concrete, in terms of the damage extent and location, is experimentally examined. The root mean square deviation (RMSD) index, adopted to quantify the changes in the admittance signatures, correlates with the damage extent. The damages on the surface that is not mounted by the PZT are also discernible. An array of transducers proves effective in detecting the damaged zone. The progressive incipient crack can be detected much before it actually becomes visible to the naked eye.

Citation Download Citation

Akshay Surendra Kumar Naidu and Suresh Bhalla "Damage detection in concrete structures with smart piezoceramic transducers", Proc. SPIE 5062, Smart Materials, Structures, and Systems, (14 October 2003); https://doi.org/10.1117/12.514900

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