Abstract: This invention concerns an aseismatic steel structure for supporting elevated constructions or works to be interposed between a plurality of reinforced concrete supporting pillars and the lower base of a block of the elevated construction. In an embodiment the structure comprises two independent pairs of hollow columns arranged substantially parallel at the four angles of an imaginary square, and coupled by flexible first arcuated members, the block of the elevated construction being supported on such columns through sliding bearings.The columns are further connected, by sliding couplings, to four flexible arcuated beams, whose lower ends rest on the reinforced concrete supporting pillars, through bearings at the top of the pillars.