New Diagnostic Index Based on Surface Waves: Feasibility Study on Concrete Digester Tank
Publication: Journal of Performance of Constructed Facilities
Volume 34, Issue 6
Abstract
In large infrastructures, the nonintrusive evaluation of structural fitness at the local scale can be time-consuming using the conventional P-wave-based ultrasonic tests. Adopting a multisensor approach to examine the surface waves propagating in a structure, on the other hand, can provide a section-by-section assessment while reducing the inspection time. Once such a configuration is established, the phase velocities of surface waves can be measured to extract diagnostic features indicating the deterioration. Hereby, the concrete roof of an anaerobic digester tank is inspected by conducting surface wave tests at 10 different sections. The recorded signals via multiple sensors are processed to extract a new diagnostic feature named the dispersion index (DI), which represents the cumulative dispersion in the phase velocity with respect to the reference dispersion curve obtained from a numerical model. The index DI is then used to categorize the tested regions into three classes of condition named: good, moderate, and deteriorated. It is found that the assessment based on the DI is in good agreement with the visual inspection for 80% of the tested sections. In addition, the crack depth is estimated using the measured cutoff frequency in the dispersion curve; the results confirm the deepest cracks located in those regions characterized as the most deteriorated by the proposed DI index.
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Data Availability Statement
The raw surface wave test data and the signal processing algorithm developed in MATLAB are available from the corresponding author upon reasonable request.
Acknowledgments
The authors would like to give special thanks to Dr. Fernando Tallavo from the Department of Civil Engineering, University of Waterloo, Ontario, Canada, for his technical advice. His contributions on the experimental design, data processing, reporting, and analysis are greatly appreciated. The authors are also thankful for the financial support given to this research project on the dynamic characterization of a concrete thank. The support given by the Natural Sciences and Engineering Research Council of Canada (NSERC) is very much appreciated.
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Published In
Journal of Performance of Constructed Facilities
Volume 34 • Issue 6 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Mar 17, 2020
Accepted: Jun 15, 2020
Published online: Sep 12, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 12, 2021
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