Damage Detection in Concrete by Fourier and Wavelet Analyses
Publication: Journal of Engineering Mechanics
Volume 129, Issue 5
Abstract
The effectiveness of vibration-based methods in damage detection of a typical highway structure is investigated. Two types of full-scale concrete structures subjected to fatigue loads are studied: (1) Portland cement concrete pavements on grade; and (2) a simply supported prestressed concrete beams. Fast Fourier transform (FFT) and continuous wavelet transform (CWT) are used in the analysis of the structures’ dynamic response to impact, and results from both techniques are compared. Both FFT and CWT can identify which frequency components exist in a signal. However, only the wavelet transform can show when a particular frequency occurs. Results of this research are such that FFT can detect the progression of damage in the beam but not in the slab. In contrast, the CWT analysis yielded a clear difference between the initial and damaged states for both structures. These findings confirm the conclusions of previous studies conducted on small-scale specimens that wavelet analysis has a great potential in the damage detection of concrete. The study also demonstrates that the approach is applicable to full-scale components of sizes similar or close to actual in-service structures.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 129 • Issue 5 • May 2003
Pages: 571 - 577
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Jan 18, 2002
Accepted: Sep 13, 2002
Published online: Apr 15, 2003
Published in print: May 2003
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