Cross-sectional modes in the impact-echo assessment of concrete strucrures

Hill, M., McHugh, J. and Turner, J.D. (2000) Cross-sectional modes in the impact-echo assessment of concrete strucrures Journal of Structural Engineering, 126, (2), pp. 228-234. (doi:10.1061/(ASCE)0733-9445(2000)126:2(228)).


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The impact-echo method is a promising technique for the detection of damage in concrete structures, particularly when applied to plate-like structures. However, when the technique is applied to beam-like rather than plate-like structures the resulting amplitude spectra are complex and difficult to interpret. The complications are due to the excitation of cross-sectional modes of vibration in the beam. This paper discusses an investigation into the nature of these modes, shows that their frequency is lowered by the presence of a large void, and discusses the potential of using these modes for nondestructive testing. Plane strain finite-element models have been used to model cross-sectional modes in the presence of both grouted and ungrouted ducts. The results from these analyses are described together with an experimental validation using a beam containing a large duct, some of which is grouted and some of which contains a void. Results are compared with previous analytical findings and found to be in agreement.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1061/(ASCE)0733-9445(2000)126:2(228)
ISSNs: 0733-9445 (print)
ePrint ID: 21677
Date :
Date Event
Date Deposited: 07 Feb 2007
Last Modified: 16 Apr 2017 22:54
Further Information:Google Scholar

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