Date of Award
Master of Science in Civil Engineering (MSCE)
Tamer El Maaddawy
Hilal El Hassan
This research aimed to examine the effectiveness of using carbon fabric-reinforced matrix (C-FRM) composites to improve the shear response of reinforced concrete (RC) deep beams. Ten RC deep beams with a/h of 1.6 were tested, where a is the shear span and his is the beam depth. Test parameters included the presence of internal shear reinforcement (no shear reinforcement and minimum shear reinforcement), number of C-FRM composite layers (one and two layers), angle of inclination of the second layer of CFRM (90o and 0o with respect to the longitudinal direction of the beam), and type of matrix (cementitious and geopolymer). In the absence of internal shear reinforcement, the use of one layer of C-FRM with cementitious and geopolymer matrices resulted in 95% and 77% increases in the shear capacity, respectively. The sheer capacity of the specimens strengthened with two layers of C-FRM composites was insignificantly higher than that of their counterparts strengthened with one layer of C-FRM. Positioning the second layer of CFRM in the vertical direction (i.e., at an angle of inclination of 90o) tended to be more effective than placing it in the horizontal direction (i.e., at an angle of inclination of 0o). The gain in shear capacity was less pronounced in the presence of internal shear reinforcement where a maximum shear strength gain of 18% was recorded. Three-dimensional numerical models were developed to predict the shear response of the tested specimens. The shear capacities predicted numerically were in good agreement with those obtained from the tests. The ratio of the predicted-to-measured shear capacity was on average 0.90 with a corresponding standard deviation of 0.09 and a coefficient of variation of 10%.
Allah, Nour Mohamed Muhsen Khir, "STRENGTHENING OF CONCRETE DEEP BEAMS USING CARBON FABRIC REINFORCED CEMENTITIOUS/GEOPOLYMERIC MATRIX" (2021). Theses. 841.