New Method for the Evaluation of Material Damping Using the Wavelet Transform
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 137, Issue 8
Abstract
Material damping is a fundamental parameter required for dynamic analysis of geotechnical and civil infrastructure. The material damping ratio is very difficult to measure in situ. A new methodology for in situ measuring of material damping using surface waves is presented in this work. This methodology is successfully evaluated on laboratory scale models and numerical simulations. Ultrasonic waves are used in this work because of the size of the laboratory models. The output force of an ultrasonic piezoelectric transmitter is modeled by using a Morlet function. The wave attenuation and phase variation of propagating surface waves with distance are analyzed using the wavelet transform. Numerical results show that the material damping ratio calculated using the wavelet transform gives a global value that represents an average damping ratio for the frequency bandwidth imposed by the seismic or ultrasonic source. Experimental results, from tests on a cemented sand and a concrete plate, show good agreement with published damping values.
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Acknowledgement
This research has been supported by the Ontario Concrete Pipe Association, Materials Manufacturing, Ontario, and the National Science and Engineering Research Council (NSERC). The authors wish to express their gratitude for this support. We are grateful to the anonymous reviewers for their time and efforts to improve our paper.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 137 • Issue 8 • August 2011
Pages: 798 - 808
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Sep 10, 2009
Accepted: Nov 12, 2010
Published online: Nov 18, 2010
Published in print: Aug 1, 2011
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