What is it about?
The experimental works includes testing the effects of the thickness of the slab, length of the CFRP sheet wrapped the steel bars, and hybrid rebars percentage. According to the results, increasing slab thickness from 100 to 120 mm of the control slabs, caused increasing in the ultimate distributed load capacity by 10.2%. The experimental results indicated also that the using of HSCRP bars as internal reinforcement improved that ultimate distributed load capacity by approximately (36 % and 31 %) in comparison with the reference slabs of the specimens with thickness of 100mm and120mm, respectively. Regarding the first crack load, no change was recorded in first cracking load in comparison with control specimen with thickness of 100 mm, while, a noticeable increasing of the load that recorded the first cracking in comparison with control specimens, for the specimens with thickness of 120 mm, the increasing came as 25% compared with the reference specimen. The Optimum length of hybridization reinforced bar in terms of the ultimate load is two-thirds of the bar length.
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Why is it important?
In this experimental study, the flexural behavior of concrete slabs reinforced by HSCFRP has been tested. The main conclusions came as follow: • Hybridization seel bar/CFRP sheet enhanced the flexural behavior of reinforced concrete slab in terms of ductility index and ultimate load capacity. Improvement of failure load was about (31 to 36%) in comparison with reference specimens. • Using hybridization reinforcement led to fewer cracks in the reinforced concrete slab because the stiffness of the slab increased. This technique could be a suitable alternative reinforcement to replace conventional steel reinforcement. • Using the hybrid bars as internal reinforcement in specimen with a thickness of 120 mm, caused a noticeable delay in the first crack occurring, It has been shown that compared with the control slab, by a percentage of 25%. • A two-thirds span strengthening length is an optimal hybrid length for achieving an adequate bonding between hybrid rebar and concrete, with no further length required.
Perspectives
The most important founding was the optimal Hybridization steel bar/CFRP sheet (strengthening length), which was clearly observed from the results; length of CFRP sheet (two-thirds of the bar length). This length positively affected the first crack load values, and any further increase in SFCB percentage above this ratio will not have a significant impact on the ultimate load capacity.
Sundus Shukur
ICRC
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This page is a summary of: Experimental assessment of the flexural behavior of concrete slab reinforced with hybrid type of rebars, January 2023, American Institute of Physics,
DOI: 10.1063/5.0140730.
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