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

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

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

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

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

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

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

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

Analytical Model of Base-isolation Building 9

Analytical Model of Base-isolation Building Hysteresis Characteristics 10

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

Effectiveness of Base Isolation System DZCEW369gal YPTNS321gal 12

Results of Earthquake Response Analyses Response Acceleration Story Displacement 13

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

Results of Earthquake Response Analyses Hysteresis Characteristics 15

Results of Earthquake Response Analyses Hysteresis Characteristics DZCEW YPTNS 16

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

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