Abstract
This chapter focuses on the detection and evaluation of seismic induced structural damages by means of changes in structural mechanical impedance at high frequencies of the order of kilohertz. Structural mechanical impedance is a direct representation of the structural parameters. However, its measurement at high frequencies is difficult by conventional means owing to practical considerations. This chapter shows how this problem can be alleviated by extracting the mechanical impedance from the electro-mechanical admittance signatures of piezoelectric-ceramic (PZT) patches surface bonded to the structure. Based on the variation of the extracted impedance elements with respect to frequency, the inherent structural components are identified. This approach eliminates the need for any a-priori information about the phenomenological nature of the structure. As proof of concept, the chapter reports a study conducted on a model of reinforced concrete (RC) frame subjected to seismic vibrations on a shaking table. The piezo-impedance transducers are found to perform better than the low frequency vibration techniques as well as the traditional raw-signature based damage quantification in the EMI technique.
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Bhalla, S., Soh, C.K. (2013). Piezo-Impedance Transducers for Evaluation of Seismic Induced Structural Damage. In: Garevski, M. (eds) Earthquakes and Health Monitoring of Civil Structures. Springer Environmental Science and Engineering. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-5182-8_5
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DOI: https://doi.org/10.1007/978-94-007-5182-8_5
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