In the framework of Fracture Mechanics, this Master Thesis aims to analyze the behaviour of Hybrid Reinforced Concrete (HRC) structural elements, in which the reinforcing secondary phase consists in a combination of ordinary steel rebars and short discontinuous fibres. Analogously to the case of Fibre Reinforced Concrete (FRC) members, experimental campaigns suggest to subdivide the flexural behaviour of HRC beams into three different stages. Considering a notched HRC element subjected to bending the related applied load versus deflection diagram starts with a linear elastic branch (Stage I), up to the initiation of the fracturing process. Then, the post-cracking regime of the composite takes place, which depends on the amount of ordinary steel rebars and of reinforcing fibres.