Interpretation of Flexural Vibration Modes from Impact-Echo Testing
Publication: Journal of Infrastructure Systems
Volume 22, Issue 3
Abstract
The main goals of this study are to provide an improved interpretation of flexural vibration modes of delaminations in concrete bridge decks detected using impact-echo testing, and to develop a simple two-dimensional (2D) visualization scheme to show the areal extent of likely delaminated regions. To achieve those goals, the study consisted of three main tasks. The first was development of an analytical formulation that relates the fundamental frequency of the response to the geometry of delamination in a concrete plate. The formulation was developed from the thin plate vibration theory and numerical model simulations. The second task was the development of a simple model for predicting dynamic behavior (flexural vibration) of delamination in concrete plates. Finally, in the third task, the validity of the proposed model was verified through a comparison of the results from an experimental study on a near-real-scale concrete bridge deck and the results reported in prior studies. As demonstrated, the developed model enables better understanding and interpretation of the dynamic response of delamination in reinforced concrete structures.
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Acknowledgments
The research presented in the paper was conducted as part of a project titled “Automated Nondestructive Evaluation and Rehabilitation System (ANDERS) for Concrete Bridge Decks.” The project was funded by the National Institute of Standard Technology (NIST) under its Technology Innovation Program (TIP). The support of the NIST-TIP is gratefully acknowledged. This article does not reflect the views or opinions of the NIST-TIP or its staff.
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Published In
Journal of Infrastructure Systems
Volume 22 • Issue 3 • September 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Nov 25, 2014
Accepted: Oct 29, 2015
Published online: Feb 23, 2016
Discussion open until: Jul 23, 2016
Published in print: Sep 1, 2016
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