Local Vibration Testing and Damage Evaluation for RC Bridge Decks
Publication: Journal of Structural Engineering
Volume 146, Issue 9
Abstract
The effectiveness of local (through-thickness) vibration testing, using a portable vibrator, is examined for determining damage locations and conditions within reinforced concrete (RC) bridge decks. The local vibration tests were conducted on deck specimens containing voids, for measuring resonant frequency during standing vibration. Wave propagation analyses based on a finite difference time domain (FDTD) method were then used to interpret the experimental results. It was shown that diffraction of waves around the void decreased the resonant frequency as the void size increased. As practical examples, local vibration tests were conducted on a deteriorated, decommissioned RC deck and bridge decks in service. The tests indicated that local resonant frequency was decreased by internal cracks within the deck. Resonant frequency distributions of the decks were also determined. The testing method is found to be applicable to detecting damage within actual bridge decks, even when the deck surfaces are covered with asphalt overlays and carbon fiber sheets. Moreover, periodic measurements could be used to evaluate the rate of deterioration of the bridge deck.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
This research was funded, in part, through research grants from the Japan Society for the Promotion of Science (Grant Nos. 25709038 and 18H01516), and the Service Center of Port Engineering of Japan (Grant No. 23-1) to Tohoku University.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 146 • Issue 9 • September 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: May 31, 2019
Accepted: Mar 6, 2020
Published online: Jun 18, 2020
Published in print: Sep 1, 2020
Discussion open until: Nov 18, 2020
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