Improved Interpretation of Vibration Responses from Concrete Delamination Defects Using Air-Coupled Impact Resonance Tests
Publication: Journal of Engineering Mechanics
Volume 139, Issue 3
Abstract
The deteriorating national infrastructure demands improved nondestructive evaluation (NDE) and structural health monitoring methods for existing concrete structures. Vibration resonance tests offer an efficient NDE method to identify and characterize shallow (near-surface) delamination defects that afflict RC structures. However, efficient implementation of effective modal analysis methods for this purpose is hindered by practical testing limitations. This paper studies vibration resonance data from square, rectangular, and circular near-surface delamination defects in concrete using two testing configurations: a coupled source-receiver set configuration (driving point type), which is analogous to the impact-echo (IE) test, and a fixed-source moving sensor configuration, which represents a conventional modal analysis test. All data were collected using contactless air-coupled sensors, which enable efficient data collection from large structures from prepared laboratory samples. An approach to self-normalize each IE data set using surface wave pulse information in the time signal is proposed. The self-normalized multipoint IE data are presented in the form of modal images, where overlap of the first few natural mode shapes accurately predicts the areal size of underlying delamination defects. The mode shapes obtained with the corrected multipoint IE testing configuration, which provides a significant advantage for the application in NDE tests because damage location, size, and shape need not be known in advance, compare favorably with those from conventional modal testing.
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Acknowledgments
This study was carried out through support from National Cooperative Highway Research Program IDEA Program (NCHRP-IDEA) Project No. 134, Dr. Inam Jawed program manager. We thank Professor Jinying Zhu from the University of Texas for her assistance with the experimental test sample.
References
ASTM. (1997). “Standard method to test pulse velocity through concrete.” C597, West Conshohocken, PA.
Cheng, C., and Sansalone, M. J. (1993). “The impact-echo response of concrete plates containing delaminations: Numerical, experimental and field studies.” Mater. Struct., 26(5), 274–285.
Ewins, D. J. (2000). Modal testing, 2nd Ed., Research Studies Press, Hertfordshire, U.K.
Garrett, B., and Rota, G. C. (1978). Ordinary differential equations, Wiley, New York.
Huang, K. (2001). “On impact induced delamination and residual compression strength of composite structures.” Ph.D. dissertation, Univ. of Twente, Enschede, Netherlands.
Idorn, G. M. (1991). “Concrete durability and resource economy.” Concr. Int., 13(7), 18–23.
Kientzy, D., Richardson, M., and Blakley, K. (1989). “Using finite element data to set up modal tests.” Sound Vibrat. Mag., 23(6), 16–23.
MathWorks. (2008). MATLAB 7.6.0 (R2008a) user's guide, The MathWorks, Natick, MA.
Pratt, D., and Sansalone, M. (1992). “Impact-echo signal interpretation using artificial intelligence.” ACI Mater. J., 89(2), 178–187.
Richardson, M. H., and Formenti, D. (1985). “Global curve fitting of frequency response measurements using the rational fraction polynomial method.” Proc., 3rd Int. Modal Anal. Conf., Vol. 1, Union College, Schenectady, NY, 390–397.
Richardson, M. H., and Potter, R. (1974). “Identification of the modal properties of an elastic structure from measured transfer function data.” Proc., 20th Int. Instrum. Symp., Vol. 20, ISA, Pittsburgh, PA, 239–246.
Sansalone, M. J., and Streett, W. B. (1997). Impact-echo: Nondestructive evaluation for concrete and masonry, Bullbirer Press, Ithaca, NY.
Schubert, F., and Köhler, B. (2008). “Ten lectures on impact-echo.” J. Nondestruct. Eval., 27(1–3), 5–21.
Zhu, J., and Popovics, J. S. (2001). “Non-contact detection of surface waves in concrete using an air-coupled sensor.” Rev. Prog. Quant. Nondestruct. Eval., 20B, 1261–1268.
Zhu, J., and Popovics, J. S. (2007). “Imaging concrete structures using air-coupled impact-echo.” J. Eng. Mech., 133(6), 628–640.
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© 2013 American Society of Civil Engineers.
History
Received: Nov 7, 2011
Accepted: Jun 7, 2012
Published online: Jul 31, 2012
Published in print: Mar 1, 2013
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