PROBLEM TO BE SOLVED: To provide a buckling restrained brace damper in which a sufficient reinforcement effect can be obtained without enlarging a cross section of the brace damper, and production is made easy at low cost.SOLUTION: A buckling restraining material 3 includes: a restraint plate 5 layered and arranged so as to sandwich a core material 2 and an insulating material 4, the restraint plate 5 being configured to restrain out-of-plane deformation of a plastic unit 21 of the core material 2; a cover plate 6 for restraining in-plane deformation of the plastic unit 21; and a stiffener 7 connected to the restraint plate 5, sandwiching the restraint plate 5, the core material 2 and the insulating material 4, and raising a whole flexural-rigidity. The buckling restraining material 3 has one end of the axial direction considered to be a fixation end and the other end considered to be movable end. In a fixed side joint of the core material 2, a shear key 8 is fixed that is adjacent to the fixed end of the buckling restraining material 3 and regulates the movement to the fixed side joint side of the buckling restraining material 3. In the inside of the stiffener 7, a longitudinal rib 74 and a transverse rib 75 are provided. The transverse rib 75 is provided at least in the movable end side of the stiffener 7. Each rib edge provides a buckling restrained brace damper coming into abutment with the side of the restraint plate 5 in a non-fixing manner.SELECTED DRAWING: Figure 1
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