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

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

5. Base Isolation System Damper
Steel damper
Oil damper
Friction damper with Coned disc springs
Lead damper
To　TOP 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 Isolated Research Building
(Elevation)
Base Isolation Device
(Floor Plan) 7

8. Base Isolation Building
Base Isolation System
Principle
Story Displacement
Acceleration
Story Displacement
Acceleration
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 Building9

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
Building with Seismic Isolation
Conventional Building 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