Patent ID: 8789320
Filing Date: 2014-07-29
Classification: E01D,E04H

Abstract:
1. A seismic isolation bearing comprising: an upper base plate having an upper surface and a lower surface, the lower surface of the upper base plate having a concave recess formed therein; a lower base plate having an upper surface and a lower surface, the upper surface of the lower base plate having a concave recess formed therein; a disc bearing core centrally positioned with respect to the planes of the upper base plate and lower base plate, the disc bearing core being in contact with the recess of the upper base plate and the recess of the lower base plate, and configured to slide along the recess of the upper base plate and to slide along the recess of the lower base plate, the recesses exerting a lateral return force on the disc bearing core when displaced from a central position; and a shear spring surrounding the disc bearing core, the shear spring (i) being coupled to the lower surface of the upper base plate and the upper surface of the lower base plate, and being configured to deform in shear upon lateral movement of the upper base plate relative to the lower base plate, and to exert a lateral return force on the upper base plate when the upper base plate is laterally displaced, and (ii) including alternating layers of an elastomeric material and a substrate material, the shear spring being configured to deform in shear along the layers of elastomeric material, and each layer of elastomeric material having a shape factor that does not exceed a value of 1.