SEISMIC ISOLATION DEVICE, SEISMIC ISOLATION SYSTEM, AND SEISMICALLY ISOLATED STRUCTURE

摘要

To provide a seismic isolation device which can suppress eccentricity of an upper structure and acts as a sliding support when a large-scale earthquake occurs, a seismic isolation system and a seismically isolated structure each using the seismic isolation devices.SOLUTION: The seismic isolation device comprises: a mounting plate 21 fixed to a structure 5 being one of an upper structure 5 and a lower structure 2 of a building structure; a sliding plate 23 fixed to the other structure 2; a laminated rubber part 24 provided such that it cannot relatively move in a horizontal direction with respect to the mounting plate 21; and a sliding member 31 provided at the sliding plate 23 side and slidably abutted against the sliding plate 23. The laminated rubber part 24 comprises: a first laminated rubber part 25 provided at the mounting plate 21 side; an axial power transmittance body 26 connected to a first laminated rubber part 25 and provided at the sliding plate 23 side. The first laminated rubber part 25 is formed to have a lower rigidity than that of the axial force transmittance body 26 and further comprises a deformation area adjusting mechanism 35 adjusting a deformation area of the first laminated rubber part 25 provided to be horizontally spaced apart from the outer circumferences 28c, 29c of the laminated rubber part 24.SELECTED DRAWING: Figure 3