The load bearing capacity of reinforced beams of fibrous high- strength concrete is investigated, experimentally and computationally. Both metallic (steel) and non-metallic (polyolefin and carbon) fibres are used, keeping the volume fraction to 1%. A nonlinear truss model is outlined which incorporates most of the pertinent mechanisms in the experiments, including the rebar-to-concrete bond and crack widths. The law for evolution of stable growth of local cracks in the structure is based on the response of uniaxial tensile tes