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Viga perfeccionada, caracterizada esencialmente por el hecho de estar constituida por un conjunto mixto, integrado por una pieza de hormigón pretensado-armado, y por unos estribos de acero embebidos en la pieza antedicha, presentando ésta última una sección de forma derivada de un trapecio isósceles, cuyos vértices relativos a los ángulos iguales adyacentes de la base mayor están truncados, siendo la arista inferior resultante matada, y proporcionando los lados oblicuos de la sección trapecial un apoyo inclinado para las viguetas.