DBPapers
DOI: 10.5593/SGEM2014/B62/S26.041

STUDY OF STRENGTHENED REINFORCED CONCRETE SHORT CORBEL BY EXTERNALLY BONDED CARBON FIBRES FABRICS

I. IVANOVA, J. ASSIH, A. LI, D. DONTCHEV
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-21-6 / ISSN 1314-2704, June 19-25, 2014, Book 6, Vol. 2, 315-322 pp

ABSTRACT
The present paper investigates experimentally the mechanical behavior of reinforced concrete corbels strengthened with carbon fibers fabrics, including the local and global strain distribution, load-carrying capacity and mode of failure. The effect of fibers fabrics configuration and some geometrical and structural parameters are studied experimentally and analyzed: the number of layers and the thickness of carbon fiber fabrics, the type of strengthening, and the orientation of the fibers in carbon fibers fabrics (unidirectional, bidirectional). As such as, effect of the type of strengthened reinforced concrete corbels directly on either sides or wrapping by externally bonded the carbon fiber fabrics. A preliminary study to found the number of layers necessary for optimal and effective strengthening is realized. Then, we compare usefully unstrengthened and strengthened reinforced concrete short corbels subjected to monotonic loading to failure. Cracking of corbels are described and different failure modes are observed. The testing shows better results for the unidirectional fibers as well as by wrapped strengthening. The extensometer technique based on electrical strain gauge is used to study the local behavior of the structure. This technique allows to measure the strain of steel, carbon fabrics and concrete. The effect of the same parameters on local behavior of the strengthening structure is examined. The ultimate load and strain of the specimens are compared to the reference corbel. The cracking mechanisms and the mode of failure under static loading are presented and analyzed. The results show an increase of more than 82% of the load carrying capacity of the corbels and improving their rigidity of the third.

Keywords: strengthening, short corbel, reinforced concrete, mechanical behavior,
composite materials;