Integrity of reinforced concrete slabs by the analysis of response waveforms

M.S. Imbabi, H. C. Tan, O.O.R. Famiyesin

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution

Abstract

The dynamic response of a reinforced concrete slab is dependent on its mass, stiffness, damping, geometry and support boundary conditions. Laboratory tests on a series of fully clamped RC slabs were subjected to incremental loading up to failure, and the dynamic response was measured as a function of progressive damage at appropriate intervals. It was found that for a grade 45 concrete slab specimen, the resonant frequencies of the slab for the first, second and third modes of vibration prior to failure, were reduced by 24.0, 4.5 and 8.8 per cent respectively, when using an impact hammer. This general trend was confirmed when burst chirp excitation was employed, where the first and third modes of vibration were similarly reduced. Of the three regions identified in the loading process, a region of almost constant frequency was noted for the first two modes of vibration. The results suggest that for the third mode, the rate of frequency change was more even throughout the load range. The third mode of vibration could thus be utilised for dynamic characterisation, to provide a reliable measure of the internal damage state of the slab.
Original languageEnglish
Title of host publicationAdvances in Civil and Structural Engineering Computing for Practice
EditorsB. H. V. Topping
Place of PublicationEdinburgh, UK
PublisherCIVIL COMP PRESS
Pages155-162
Number of pages8
ISBN (Print)0-948749-58-X
DOIs
Publication statusPublished - 1998
EventThe First International Conference on Engineering Computational Technology and the Fourth International Conference on Computational Structures Technology - Edinburgh , United Kingdom
Duration: 18 Aug 199821 Aug 1998

Publication series

NameCivil-Comp Proceedings
PublisherCivil-Comp Press
ISSN (Electronic)1759-3433

Conference

ConferenceThe First International Conference on Engineering Computational Technology and the Fourth International Conference on Computational Structures Technology
Country/TerritoryUnited Kingdom
CityEdinburgh
Period18/08/9821/08/98

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