1. Structural beam (1) for the design of building systems or structures (S), containing the first and second end (11 '), and the specified structural beam (1) is characterized in that it includes one or more fasteners (12, 12' , 12 ″, 12 ″ ″) at least one of the said ends (11 ′), installed in the longitudinal direction in the specified structural beam (1) .2. Structural beam (1) according to claim 1, characterized in that it includes said fasteners (12, 12 ′, 12 ″, 12 ″ ″) from each end (11 ′). A structural beam (1) according to any one of the preceding claims, characterized in that said fasteners (12, 12 ′, 12 ″, 12 ″ ″) are attached to said structural beam (1) with a layer (13) of epoxy resin. Structural beam (1) according to claim 1 or 2, characterized in that said fasteners include rods (12 '). 5. A structural beam (1) according to claim 4, characterized in that said rods (12 ') are bent so as to have an L-shape. Structural beam (1) according to claim 1 or 2, characterized in that said structural elements include threaded rods (12 ″) provided with a corresponding lock nut (12 ″ ″). Structural beam (1) according to claim 1 or 2, characterized in that it contains a recess (14) at one or both ends (11 '). 8. Structural beam (1) according to claim 1 or 2, characterized in that it includes joints (15) fixed on the outer surface. Structural beam (1) according to claim 1 or 2, characterized in that it is made of wood and / or laminated or solid wood beams. 10. Construction system (S) comprising a reinforced concrete frame (2, 6, T), a plurality of structural beams (1), as defined in any of paragraphs. 1-9,
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