Shear Behavior of Reinforced Concrete Deep Beams Strengthened with Carbon Fiber under Static Loading

DOI: 10.14416/j.ind.tech.2024.04.011

Abstract

This study investigates the shear behavior of reinforced concrete (RC) deep beams strengthened with carbon fiber reinforced polymer (CFRP). The experiment was divided into two groups of deep beams, which had a shear span to effective depth ratios (a/d ratios) of 1.00 and 2.00. In total, six identical specimens with dimensions of 0.20 x 0.45 x 2.4 meters were applied by two techniques to strengthen the RC deep beams: U-wrap and Fully wrap. Experimental results reveal that shear strength, in terms of load carrying capacity of the beams strengthened by Fully wrap type CFRP was higher than that of the beams strengthened by U-wrap type CFRP. The increase in the load carrying capacity compared to the reference beam in Group 2 beams was greater than that in Group 1 beams, indicating that the effectiveness of shear strengthening was evident when the beams had a/d ratio was high and it was little effected when the beam was a low a/d ratio. As a result, when the beam has a lower a/d ratio, the more concrete will play an important role in resisting high shear force as a result of Arch action behavior. The shear force transfer consists of Compression strut and Tension tie. The most of shear strength depended on the compressive strength of the concrete in the compression strut.