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Vibration and Earthquake Isolation

Multi-step-base-isolator

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Multi-step base isolator

Details

Inventors: Shustov, Valentin N.;
Assignee:
Primary Examiner: Scherbel; David A.
Assistant Examiner: McGann Ripley; Deborah
Attorney, Agent or Firm:

A manufacture to protect a structure from destructive earthquakes as well as to secure its stability under the strongest possible wind, having a number of ball transfer units rigidly coupled to a supported superstructure; the same number of pedestal plates supporting the ball transfer units, each having an upper surface having a plurality of curved surfaces with a central depression following the shape of the ball. The force of gravity will keep the structure in its steady initial position when the balls are inset into corresponding depressions at any wind pressure and at slight earthquakes. With magnitude of earth movement exceeding a certain threshold the balls get out of central depressions thus providing a controlled separation of the superstructure from the foundation, and the upper surfaces of pedestal plates with properly designed geometry governs transfer of horizontal movement into the superstructure and prevents hazardous structural vibrations.

DETAILED DESCRIPTION To minimize the transmission of earthquake energy into a superstructure and to confine the base shear in the substructure by an acceptable level, a base isolator is offered which includes of a ball transfer unit.
The ball rests on a depression which is shaped in compliance with the configuration of the contacting surface of the ball and is centered at the lowest point of the pedestal plate having a plurality of concave surface and resting on a foundation.
The upper surface of the pedestal plate consists of several concentric spherical surfaces of increasing radii of curvature and transforming into each other.
Maximum vertical grade of every surface component is the same and is approximately equal to the ratio of the design wind load to the weight of the structure.

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