Aim of the present paper is the evaluation of the effectiveness of strengthening interventions with fiber reinforced concrete (FRC), with particular reference to the ductile behavior. As a matter of fact rehabilitation intervention with a material working in tension, but with brittle behavior, cannot be effective for the plastic capacity of the structure. In this framework a high-performance fiber reinforced concrete is defined and applied as thin layers to beam elements. The behavior of the composite schemes is examined with analytical and numerical models, and the effects of the FRC application on the local and global ductility is analyzed