Browsing by Author "Lee, David A."

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    Negative stiffness device and method
    (2014-10-14) Constantinou, Michael C.; Reinhorn, Andrei M.; Sarlis, Apostolos A.; Taylor, Douglas; Lee, David A.; Nagarajaiah, Satish; Pasala, Dharma Theja R.; Research Foundation for the State University of New York; Rice University; Taylor Devices, Inc.; United States Patent and Trademark Office
    A negative stiffness device and method for seismic protection of a structure is described. In one embodiment, the device has an anchor frame and a movement frame laterally translatable relative to the anchor frame. The anchor frame and movement frame have respective extension portions. A linkage is pivotably connected to the extension portion of the anchor frame. A compressed spring has a first end is attached to the extension portion of the movement frame and a second end attached to the linkage. The compressed spring has a spring force. In a rest state, the compressed spring does not apply a lateral force to the movement frame. In an engaged state, the compressed spring is configured to apply a lateral force to displace the movement frame in a lateral direction of a seismic load. The spring force is amplified by the linkage when the movement frame is laterally displaced to an amplification point.