Patent ID: 9206616
Filing Date: 2015-12-08
Classification: E04H

Abstract:
1. A negative stiffness system for seismic protection of a structure, comprising: an anchor frame and a movement frame, the movement frame being laterally translatable relative to the anchor frame; a first negative stiffness device, including: at least one additional negative stiffness device, each additional negative stiffness device including: wherein in a rest state, the second spring is compressed to exert a preload force to the first linkage and the anchor frame and not displace the first linkage and the movement frame; wherein in an engaged state, the second spring is configured to apply a second force to the first linkage of the first negative stiffness device such that the movement frame is displaced in the same lateral direction of the seismic load; and wherein the second spring force is amplified by the first linkage when the frame is laterally displaced to the amplification point; wherein each of the first spring and the second spring are arranged to provide a cumulative, positive force to displace the movement frame in the same lateral direction of the seismic load.