Shear strength prediction of CFRP-strengthened deep RC beams without shear reinforcement

The shear behavior of slender reinforced concrete (RC) deep beams strengthened with externally bonded carbon fiber reinforced polymer (CFRP) systems has been the subject of numerous investigations over the past few decades. However, very little study has been done to examine the shear behavior of deep RC beams strengthened using CFRP. This study used an experimental and analytical analysis to look at the shear behavior of deep RC beams strengthened with CFRP of different modulus and fiber orientation. Five shear-deficient beams were constructed and tested for failure. The findings demonstrate that the modulus of elasticity and fiber orientation of CFRP sheets have an impact on shear capacity improvements. A simple design methodology based on the strut-and-tie method was presented to evaluate the shear capacity of deep beams strengthened by CFRP, and the results were compared with the experimental findings of the current work as well as experimental results from the literature. The findings demonstrate that the suggested approach is more accurate than the widely used design codes ACI 440.2R-17, TR55, and fib (2001) in estimating the shear capacity of CFRP-strengthened deep RC beams.