Structural behavior of fibrous SCC beams reinforced longitudinally by GFRP bars and strengthening with CFRP bonded at shear span

In the present study, an experimental work was conducted on high strength self-compacted concrete HS-SCC beams to examine their shear response when reinforced internally with longitudinal bars of GFRP and externally strengthened by using CFRP bonded technique. Two configurations of CFRP; full side sheets and U-strips bonded to their shear sides, as well as, three ratios steel fiber of (0.0,0.5 and 1)% were used. The program consisted of eleven beams; one concrete beam was reinforced longitudinally with internal steel bars and transversely using closed stirrups and was represented as control specimens for comparison. While in other ten beams, flexural bars of GFRP were used instead of usual steel reinforcement. Experimental results show that using this type of GFRP bars as alternative usual steel bars somewhat increased load at failure stage but with lower stiffness. Also, externally bonded CFRP Full side sheets can be an effective substitutional for durability and architectural significance. A combination of Full side sheets and inclusion of suitable quantity of steel fiber is shown to conduct better than usual stirrups in terms of increasing carrying strength about 111 % and diminishing deflections of concrete specimen with GFRP reinforcement. (C) 2020 The Author(s). Published by Elsevier Ltd.