| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative rigid damper capable of exhibiting both functions of negative rigidity and frictional damping by one device, capable of extending a base isolation period, increasing a damping effect of a base isolation structure by frictional damping, and having a trigger function with a simple constitution.SOLUTION: A negative rigid damper includes: an upper member 5 which can be attached to one of a pair of members and has a concave groove 5a opened downward; a lower member 4 which can be attached to the other member, and has a convex upper surface 4b having a curvature smaller than that of the concave groove of the upper member, and is formed in a semicylinder shape; a sliding member 7 which has a convex upper surface 7a having a curvature which is the same as that of the concave groove of the upper member, and a concave lower surface 7b having a curvature which is the same as that of the convex upper surface of the lower member; and energizing means (coil springs) 13 and 14 which energize the sliding member to the upper surface of the lower member. In the state that the concave lower surface of the sliding member is energized to the convex upper surface of the lower member, the sliding member slides on the convex upper surface of the lower member while the sliding member is rotated between the concave groove of the upper member and the convex upper surface of the lower member. |
