The present invention is to prevent buckling of the brace is installed in the lateral force resistance elements for seismic retrofit of Steel Moment Frames will be on reinforcing structure. Buckling preventing candidates in advance of steel braces STEEL Steel Moment Frames according to the preferred embodiment of the present invention is installed in steel moment frames act as the lateral force resistance element and a web connecting the upper flange and the lower flange each other, and these flanges parallel to each other In the reinforcing structure of the brace consisting of a steel material constituting the H-shaped cross-section, each of the viscoelastic material attached to the web either side of the brace; First and second concrete blocks disposed symmetrically to each other relative to the web of the brace; And the first, second, and wrapped around a concrete block in a direction perpendicular to the length direction and the longitudinal direction includes a first and second fiber-reinforced plastic sheet to bond the concrete blocks in the brace, the first and second concrete block is to the height of the brace, the corresponding cross-section with a width enlarged portion with a predetermined length extending from both ends of the upper flange and the lower flange has a height, protruding from the expanded section reinforcement insert section to be inserted into the space surrounded by the upper flange and a lower flange and web of the brace being constituted by the reinforcing facing the viscoelastic material attached to the web of the end face, the brace, the insertion portion is characterized in that the reinforcing iron plate is installed. ;
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