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Vibration and Earthquake Isolation

Integrated-horizontal-and-vertical-seismic-isolation-bearing

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Details

Inventors: Yoo, Bong; Koo, Gyeong-Hoi; Lee, Jae-Han; Cho, Mann;
Assignee: Korea Atomic Energy Research Institute (Seoul, KR); Korea Electric Power Corporation (Seoul, KR)
Primary Examiner: Safavi; Michael
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Westerman, Hattori, McLeland & Naughton

A seismic isolation bearing device is disclosed in which a laminated elastic rubber-steel bearing adapted to isolate horizontal seismic loading cooperates with a vertical isolation device employing a compression spring, or equivalent device, effective for isolating vertical seismic loadings whereby a three dimensional seismic isolation device is effective to isolate both vertical and horizontal seismic loadings to insure the structural integrity of a superstructure against damage induced by seismic events. The isolation device formed of an isolation cylinder fixed to the structure, with an upper fixing plate vertically movable within the cylinder. A plurality of steel balls being disposed within a space formed between the perimeter of the upper fixing plate and the interior wall of the isolation cylinder. The balls facilitating the guided relative vertical movement between the upper fixing plate and the isolation cylinder. A compression spring within the cylinder and between the upper fixing plate and the structure serves to dampen the vertically imposed seismic loads.

DETAILED DESCRIPTION The ISIB of the present invention is a three-dimensional seismic isolation device which combines properties of a conventional laminated elastic rubber-steel bearing for horizontal isolation with a vertical isolation device, such as a coil spring and/or vertical, laminated rubber-steel device.
Specifically, the ISIB of the present invention is a horizontal seismic isolator device having a laminated elastic rubber-steel bearing combined with a vertical seismic isolation device using a coil spring and/or vertical laminated rubber-steel device dependent upon the weight of the superstructure to be isolated.
The disclosed ISIB is an innovative three-dimensional seismic isolation device operative in both horizontal and vertical directions which can ensure the structural integrity of a superstructure during earthquake events.
The fabrication and the assembly of the inventive ISIB are easy and the operation mechanism thereof is very simple.
Therefore, the inventive ISIB is an excellent seismic isolation device for a seismically base-isolated system when subjected to both horizontal and vertical earthquakes.
Thus, this invention is intended to create a three-dimensional seismic isolator for both horizontal and vertical directions which is made by combining properties of a conventional laminated elastic rubber-steel bearing with those of a vertical isolation device comprising a coil spring or other vertical laminated rubber-steel device, several steel balls and a vertical isolation cylinder.

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