The document discusses base isolation technology for buildings. It begins by explaining the principle of base isolation systems, which work like suspension systems in cars using laminated rubber bearings and dampers. It then provides an example of a base-isolated research building in Tokyo. The document analyzes the seismic response of base isolation buildings compared to conventional buildings. It models and tests buildings using different earthquake waves as inputs and finds that base isolation is more effective at reducing accelerations and displacements.

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

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

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

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

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

6. Example of Base-isolation Building Base Isolated Research Building Base Isolation Device Location : Tokyo Architect : Obayashi Corporation Structure : RC ; B1,5F Total floor area : 1,624 ｍ 2 Date of completion : August 1986 6

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

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

9. Analytical Model of Base-isolation Building 9

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

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

12. Effectiveness of Base Isolation System 12 DZCEW369gal YPTNS321gal

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

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

15. Results of Earthquake Response Analyses 15 Hysteresis Characteristics

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

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

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