Abstract
Flexural behavior of concrete beams reinforced with hybridization steel rebar enclosed by CFRP sheet has been explored in this paper. Seven specimens have been casted and tested under two-point load, one served as a control beam which was reinforced by ordinary steel bars, and six beams were reinforced with hybrid steel bar/sheet CFRP. Two main parameters have been considered which were the length of the hybrid steel bar/sheet CFRP and layers of carbon sheet warping steel bar. The response has been investigated in terms of failure modes, ultimate load, first cracking load, maximum deflection, crack patterns, load-deflection curves. The experimental results indicated that hybrid steel bar/sheet CFRP techniques yielded the same behavior as the control beams and reduced the maximum deflection. Also, it is improved the load capacity by about (4.35% to 42.61%) in comparison with reference beam. Effective reduction of maximum deflection was indicated throughout behavior of all enhanced specimens while no change was recorded in first cracking load in comparison with control specimen. Hybridization length (1200 mm) which represent two-thirds of beam length gives an optimal length of strengthening for one and two layers in terms of ultimate load by 21.74% and 39.13% compared to control beam, respectively.
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