Retrofit of Reinforced Concrete Deep Beams with Different Shear Reinforcement by Using CFRP

Abstract

The purpose of this paper is to study the experimental behavior and efficiency for retrofitted of reinforced concrete deep beams by carbon fiber reinforced polymer sheets, CFRP. An experimental program was conducted to retrofit nine failed deep beams by external CFRP sheets. Horizontal and vertical transverse reinforcement and shear span to depth ratios, were the main studied parameters in this paper. It was concluded that using this retrofitted method is very efficient and a gain in the ultimate load capacity of the deep beams was obtained. This gain was due to the efficiency of the external carbon fiber sheets to resist an extra applied load after failure. The failure in most of the retrofitted specimens was due to separate carbon fiber sheets from concrete or due to concrete crushing.

Keywords: Deep beams, Retrofit, CFRP sheets, Web reinforcements, Shear span/depth ratio.