Patent ID: 8511025

Claim:
A metal joint that is mounted between a pair of structures, and exerts a damping effect by yielding in accordance with a relative displacement between the pair of structures, the metal joint comprising: a first connecting part that is connected to one of the structures; a second connecting part that is connected to the other of the structures; and a damping member that is connected between the first connecting part and the second connecting part, wherein the first and second connecting parts are disposed at positions that face each other in a direction substantially orthogonal to a direction of the relative displacement generated between the pair of structures; the second connecting part is provided with a pair of connecting members disposed at symmetrical positions between which the first connecting part is interposed; the damping member exerts the damping effect in accordance with the relative displacement that is generated between the pair of structures; one edge and an other edge of the connecting members are connected to each other by a first reinforcing steel member and a second reinforcing steel member, respectively; the first connecting part comprises a cylindrical steel member into which an anchor member, which is one of the pair of structures, is inserted; the anchor member inserted into the cylindrical steel member is fixed to both ends of the cylindrical steel member through a nut; and when the direction of the relative displacement is defined as a first direction and a direction where the first and second connecting parts face each other is defined as a second direction, the damping member is a damper steel plate that is provided substantially parallel to a plane that includes the first and second directions; the damper steel plate is a pair of damper steel plates which are substantially axisymmetrically disposed with the first connecting part interposed therebetween; when a length of the damper steel plate in the first direction is seen in the second direction, a length of a middle portion of the damper steel plate is shorter than a length of both ends of the damper steel plate, and a size of the damper steel plate is set so that equations (a), (b), (c) and (d) are satisfied, M/Z<σy (a), (1.5 ×Q )/ A<τy (b), b/t< 10 (c), l/b> 3 (d), wherein: M denotes a bending moment that is applied to the both ends in the second direction of the damper steel plate, Z denotes a section modulus at the both ends in the second direction of the damper steel plate, σy denotes a tensile yield stress of the damper steel plate, Q denotes a shear force that is applied to the damper steel plate, A denotes a sectional area in the middle portion in the second direction of the damper steel plate, τy denotes a shear yield stress of the damper steel plate, b denote a width of the both ends of the damper steel plate, t denote a thickness of the damper steel plate, and l denote the length of the damper steel plate in the first direction.