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Seismic Performance of Base Isolation Buildings during 2003 Off Tokachi Earthquake

Seismic Performance of Base Isolation Buildings during 2003 Off Tokachi Earthquake

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Seismic Performance of Base Isolation Buildings during 2003 Off Tokachi Earthquake

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  1. Seismic Performance of Base Isolation Buildings during 2003 Off Tokachi Earthquake Taiki SAITO Building Research Institute, JAPAN ( tsaito@kenken.go.jp ) 1

  2. Outline • 2003 Off Tokachi Earthquake • Characteristics of earthquake • Damage photos • Earthquake response of base isolation buildings • Government building • Office building • Hospital • Bank • Summary 2

  3. 2003 Off Tokachi Earthquake Date: 26th September, 2003 Time: 4:50 am Magnitude: 8.0 Location: 41°46.78'N 144°4.71'E Depth: 42km Missing: 2 people Injured: 847 people 3

  4. JMA Intensity Map 4 (Data: JMA)

  5. Damage by Tsunami after the earthquake 5 (Photos from Hokkaido Journal)

  6. Damage of roads 6 (Photos from Hokkaido Journal)

  7. Damage of buildings 7 (Photos from Hokkaido Journal)

  8. Damage of buildings 8 (Photos from Hokkaido Journal)

  9. Damage of Oil Tank Tomakomai City (220 km from Epicenter) Natural Period for Sloshing = 7 sec 9 (Photos from Hokkaido Journal)

  10. Effect of long period earthquake Tomakomai Contour Map for Response Velocity (T=7 sec) 7 sec Earthquake Velocity Wave (0.05-0.5Hz) 10 (Data: Disaster Prevention Research Center)

  11. Base isolation buildings in Kushiro city 11

  12. [1] Government office building SRC structure with steel braces 9-story building with 1-story basement Reference: T.Kajima, A.Ito, H. Fujita, “Earthquake record of 2003 Off Kushiro Earthquake at Kushiro-government office”, Mensin Journal, pp. 36-38, N0.43, 2004.2 12

  13. Allocation of base isolation devices Sensor 64 Natural rubber bearings, 56 lead dampers and 32 steel dampers 13

  14. Observed records 14

  15. Distribution of max. acceleration response 15

  16. Orbit of displacement 16

  17. [2] Office building RC wall structure 3-story building Reference: Y.Takenaka, T.Yasuda, Y. Suzuki, “Earthquake observation of base isolation building in Kushiro city at 2003 Off Kushiro Earthquake”, Mensin Journal, pp. 31-35, N0.43, 2004.2 17

  18. RFL Sensor B : 600 Base Isolator φ Scratch Board A 1FL Sensor Basement Sensor ▽ ▽ 装置芯 装置芯 Y X 1 2 Allocation of base isolation devices 4 Lead rubber bearings 18

  19. Base isolation devices Lead rubber bearing 19

  20. Distribution of max. acceleration response 20

  21. Y(NS) X(EW) Orbit of displacement 21

  22. [3] Hospital building RC structure 3-story building with penthouse Fist base isolation hospital in Japan Reference: S.Sakai, Y.Ito, T.Iida, “Earthquake respnse of base isolation hospital”, Mensin Journal, pp. 41-43, N0.43, 2004.2 22

  23. Allocation of base isolation devices 50 High damping rubber bearings 23

  24. Observed records MAX= 155 cm/s2 (EW) MAX= 212 cm/s2 (EW) MAX= 123 cm/s2 (NS) MAX= 142 cm/s2 (NS) MAX= 145 cm/s2 (UD) MAX= 100 cm/s2 (UD) 24

  25. RF 3F 2F 1F BF Distribution of max. acceleration response 25

  26. N Orbit of displacement EW NS NS UD EW 26

  27. [1] Banking facility SRC structure 7-story building with 1-story basement and penthouse Reference: M.Todo, H.Seki, “Earthquake record of 2003 Off Kushiro Earthquake at Kushiro-bank headquarter”, Mensin Journal, pp. 39-40, N0.43, 2004.2 27

  28. Allocation of base isolation devices 15 Natural rubber bearings, 11 lead dampers, and 6 steel dampers 28

  29. Base isolation devices natural rubber bearing steel damper lead damper 29

  30. Characteristics of base isolation devices 30

  31. Acceleration response (X-direction) 31

  32. Acceleration response (Y-direction) 32

  33. Orbit of displacement 33

  34. Summary of base isolation effect 0.95 0.80 0.73 0.73 0.54 0.82 0.47 0.87 0.35 0.42 0.45 0.22 1 2 3 4 (1995 Kobe earthquake) 34

  35. Summary of displacement Building 1 Building 2 N Building 3 Building 4 35