Structural element made of reinforced concrete comprising: - a first reinforcement, which first reinforcement comprises at least one first continuous elongated element which is made of steel for reinforced concrete and which develops mainly along the longitudinal extension of said structural element, and - a second reinforcement, which second reinforcement comprises at least a second continuous elongated element which develops mainly along the longitudinal extension of said structural element, wherein the area subtended to the force/displacement curve of said structural element or of a specimen corresponding to said structural element subjected to flexural test in accordance with the standard UNI EN 12390-5:2002 of 1 June 2002 with force acting along a direction substantially orthogonal to the longitudinal extension of said structural element or of said specimen replicating said structural element is greater by at least 20% than the area subtended to the force/displacement curve of a reference structural element replicating said structural element or of a reference specimen replicating said specimen corresponding to said structural element, but lacking said second reinforcement, subjected to said same flexural test, in which the increase of said area is recorded substantially after the breaking point ( C1÷C7) of said at least one first continuous elongated element, characterised in that said at least one second elongated element is also embedded in the concrete, is of a flexible type and comprises at least one rope or one cable, wherein the ratio between the area of the circle circumscribed to said at least one second continuous elongated element in the form of rope or cable and the sum of the areas (An) of the circles circumscribed to each strand and a possible core constituting said rope or said cable is ≥ 1.1, preferably between 1.1 and 2.01. - a first reinforcement, which first reinforcement comprises at least one first continuous elongated element which is made of steel for reinforced concrete and which develops mainly along the longitudinal extension of said structural element, and - a second reinforcement, which second reinforcement comprises at least a second continuous elongated element which develops mainly along the longitudinal extension of said structural element, wherein the area subtended to the force/displacement curve of said structural element or of a specimen corresponding to said structural element subjected to flexural test in accordance with the standard UNI EN 12390-5:2002 of 1 June 2002 with force acting along a direction substantially orthogonal to the longitudinal extension of said structural element or of said specimen replicating said structural element is greater by at least 20% than the area subtended to the force/displacement curve of a reference structural element replicating said structural element or of a reference specimen replicating said specimen corresponding to said structural element, but lacking said second reinforcement, subjected to said same flexural test, in which the increase of said area is recorded substantially after the breaking point ( C1÷C7) of said at least one first continuous elongated element, characterised in that said at least one second elongated element is also embedded in the concrete, is of a flexible type and comprises at least one rope or one cable, wherein the ratio between the area of the circle circumscribed to said at least one second continuous elongated element in the form of rope or cable and the sum of the areas (An) of the circles circumscribed to each strand and a possible core constituting said rope or said cable is ≥ 1.1, preferably between 1.1 and 2.01.