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), 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.
|Subjects:||T Technology > TH Building construction|
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences
|Date Deposited:||07 Feb 2007|
|Last Modified:||02 Mar 2012 13:26|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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