The aim of the present work is to analyze the use of bars made of composite material to act as reinforcement for concrete beams subjected to bending. The analyzed bars are constituted by polymer reinforced with carbon fibers (PRFC), a material that presents linear elastic behavior until rupture. This material has some advantages in relation to steel, such as considerably higher tensile strength in addition to not being susceptible to the phenomenon of corrosion caused by environmental conditions. During the development of the work, an article was obtained which demonstrates results of laboratory tests in which the authors used concrete beams subjected to flexion testing by four points and reinforced with PRFC bars. In this work, the same test was simulated in the Atena software, a program that performs non-linear analysis for concrete structures, considering the cracking of this material. The results obtained by the software were consistent with the results recorded in the laboratory by the authors. It was also analyzed a continuous concrete beam subjected to a uniformly distributed load. This beam was reinforced with bars of the same diameter, changing only the material of these bars (steel and PRFC. In this way, the loading value that causes the beam to break when it is reinforced with steel bars and when it is reinforced with PRFC bars of the same diameter was analyzed. Two important disadvantages of PRFC bars in relation to steel have been noted. Due to its elastic behavior until breaking, this composite material does not give the concrete structure a ductile rupture. In addition, its cost is considerably higher than steel bars, since no suppliers of this type of reinforcement have been identified in Brazil, thus increasing the cost to purchase this product. The objectives of this work were accomplished and, in the end, new studies are proposed to be carried out on the theme.