Montaser, Wael, Shaaban, Ibrahim ORCID: https://orcid.org/0000-0003-4051-341X, Rizzuto, Joseph, Zaher, Amr, Rashad, Ahmed and El Sadany, Shorouk (2023) Steel reinforced self-compacting concrete (SCC) cantilever beams: bond behaviour in poor condition zones. International Journal of Concrete Structures and Materials. ISSN 1976-0485

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Abstract

Previous investigations carried out on reinforced self-compacted concrete (SCC) beams have reported contradictory results on reinforcement bond behaviour occurring in the zones defined for good bond conditions according to Eurocode2. Cantilevered SCC beams’ critical upper tension reinforcement bond behaviour has previously had limited reporting. In this study, the bond behaviour in normally vibrated concrete (NVC) and self-compacted concrete (SCC) in poor condition s zones are compared and the differences are highlighted. The effect of four parameters , including (i) concrete type (SCC and NVC), (ii) characteristic strength of SCC, (iii) lap splice length, and (iv) depth of concrete cover for the reinforcement is investigated. It was found that for the studied beams, increasing splice length improved the energy absorption and changed the failure mode to a more ductile manner even at the poor bond conditions zones. The maximum measured steel strains in SCC beams in the lap splice zones, were higher than those for NVC specimens. The mean bond stress values, for SCC beams with 25% and 50% lap splice lengths, were higher than those of NVC beams, with the same lap splice lengths, by 16% and 13%, respectively. The results of the current study showed that the empirical equations from the literature overestimated the bond strength of the splice lap length for cantilever upper steel in SCC beams with long splices which agrees with the state of the art as these equations were developed originally for short anchorage lengths.

Item Type:	Article
Identifier:	10.1186/s40069-023-00581-9
Additional Information:	The version of record of this article, first published in International Journal of Concrete Structures and Materials, is available online at Publisher’s website: https://ijcsm.springeropen.com/
Keywords:	Self-compacting concrete; bond strength; bond stress; lap length of steel bars in tension; empirical equations; concrete cover; poor bond conditions.
Subjects:	Construction and engineering > Civil and environmental engineering
Related URLs:	Publisher Publisher
Depositing User:	Ibrahim Shaaban
Date Deposited:	06 Jan 2023 13:39
Last Modified:	04 Nov 2024 11:20
URI:	https://repository.uwl.ac.uk/id/eprint/9725

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