The paper evaluates the strength and fatigue characteristics of reinforced damaged steel beams using composite materials – fiber reinforced polymers (FRP) using an analytical model using the ANSYS program. An approach to design based on the methodology of a constant fatigue schedule is considered; models of five steel beams reinforced with carbon fiber are constructed in the ANSYS program. The model was loaded with a symmetrically located concentrated load until destruction. Fa-tigue crack propagation curves have shown that carbon fiber plates restrain crack growth and increase durability. The results showed that carbon fiber reinforcement of steel beams increases the ultimate load and increases the plasticity of the beam.