SHEAR BEHAVIOR OF SELF-COMPACTING CONCRETE BEAMS REINFORCED WITH B500WR AND STRENGTHENED WITH CFRP

Abstract

Fiber Reinforced Polymer (FRP) has become increasingly attractive due to its advantageous low weight, high stiffness and strength-to-weight ratio, corrosion resistance, lower maintenance costs, and faster installation time. Experimental and numerical studies researches show that using (FRP) materials to strengthen reinforced concrete (RC) beams in shear is an effective method. The purpose of this paper is to study the effect of strengthening self-compacting concrete beams using carbon fiber-reinforced polymer (CFRP) fabrics with different wrapping schemes in shear. Five rectangular beams of a rectangular cross section of 100×250 mm and a length of 1650 mm were cast and tested under four-point bending. One beam was used as a control beam without external strengthening, while the other four beams were strengthened in shear using U-Wrapped CFRP with different widths and densities. The used CFRP led to an increase in the load-carrying capacity, failure load, displacement ductility ratio, and displacement ductility index, but energy ductility was decreased. The investigation results are presented in terms of ultimate load, deflection, tensile and compressive strains, and cracking pattern. relationship, between the control beam, SR, and the four strengthened beams S1, S2, S3, and S4. As shown, the deflections of strengthened beams S3 and S4 are smaller than those of the control beam up to its failure load. On the other hand, the deflections of strengthened beams S1 and S2 are more than those of the control beam for all stages of loading.