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Base Isolation Technology

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  1. Base Isolation Technology ・Principle of Base Isolation System ・Example of Base-isolation Building ・Analytical Model of Base-isolation Building ・Input Earthquake Waves ・Results of Earthquake Response Analyses November, 2000 1

  2. Principle of Base Isolation System Base Isolation System is like a Suspension System of Motorcar Soft spring + Oil Damper Laminated rubber bearing Damper ToTOP 2

  3. Base Isolation System Laminated rubber bearing Soft in Horizontal direction Hard in Vertical direction Rubber Sheet Steel Plate ToBack 3

  4. Base Isolation System 1. Vertical direction Rubber block Laminated rubber bearing 2. Horizontal direction Rubber block Rubber block Laminated rubber bearing Principle of Laminated rubber bearing ToBack 4

  5. Base Isolation System Damper Oil damper Steel damper Friction damper with Coned disc springs Lead damper ToTOP 5

  6. Example of Base-isolation Building Location : Tokyo Architect : Obayashi Corporation Structure : RC ; B1,5F Total floor area : 1,624 m2 Date of completion : August 1986 Base Isolated Research Building Base Isolation Device 6

  7. Example of Base-isolation Building Steel Damper Rubber Bearing Base Isolation Device (Floor Plan) Base Isolated Research Building (Elevation) 7

  8. Base Isolation Building Base Isolation System Principle Acceleration Acceleration Story Displacement Story Displacement Conventional Building Amplification factor of acceleration Base Isolation Building El Centro 1940NS 25Kine Input Period(sec.) Seismic Acceleration Response Spectrum Comparison of Seismic Response 8

  9. Analytical Model of Base-isolation Building 9

  10. Analytical Model of Base-isolation Building Hysteresis Characteristics 10

  11. Input Earthquake Waves KOBENS (818gal) DZCEW (369gal) YPTNS (321gal) 11

  12. Effectiveness of Base Isolation System DZCEW369gal YPTNS321gal 12

  13. Results of Earthquake Response Analyses Response Acceleration Story Displacement 13

  14. Results of Earthquake Response Analyses KOBENS (818gal) DZCEW (369gal) YPTNS (321gal) 14

  15. Results of Earthquake Response Analyses Hysteresis Characteristics 15

  16. Results of Earthquake Response Analyses Hysteresis Characteristics DZCEW YPTNS 16

  17. Effects of Base Isolation System ・Improvement for Safety of Building ・Keep for Function of Building ・Preservation for Property Conventional Building Building with Seismic Isolation 17

  18. Application of Base-isolated Structure 1) Government and Municipal Office, Fire Station, Police Station, Broadcasting Station 2) Hospital, Social welfare facilities 3) Laboratory 4) Computer Center 5) Museum, Gallery, Library 6) Apartment House 7) Cultural Asset, Historic Structure 18