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Seismic Performance of Base Isolation Buildings during 2003 Off Tokachi Earthquake Taiki SAITO Building Research Institute, JAPAN (

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Presentation on theme: "Seismic Performance of Base Isolation Buildings during 2003 Off Tokachi Earthquake Taiki SAITO Building Research Institute, JAPAN ("— Presentation transcript:

1 Seismic Performance of Base Isolation Buildings during 2003 Off Tokachi Earthquake Taiki SAITO Building Research Institute, JAPAN ( 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: 26 th 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 (Data: JMA) 4

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

6 Damage of roads (Photos from Hokkaido Journal) 6

7 Damage of buildings (Photos from Hokkaido Journal) 7

8 Damage of buildings (Photos from Hokkaido Journal) 8

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

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

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 , N0.43,

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

14 Observed records Place Maximum Acc,(cm/s 2 ) N167°EN257°E UD Building 09F F B1F Ground GL G G

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 , N0.43,

18 Allocation of base isolation devices 4 Lead rubber bearings 18

19 Base isolation devices Lead rubber bearing 19

20 Distribution of max. acceleration response (EW) (NS) UD RFL FL Basement Input

21 Orbit of displacement X ( EW ) ( NS ) 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 , N0.43,

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

24 Observed records MAX= 212 cm/s 2 (EW) MAX= 142 cm/s 2 (NS) MAX= 100 cm/s 2 (UD) MAX= 155 cm/s 2 (EW) MAX= 123 cm/s 2 (NS) MAX= 145 cm/s 2 (UD) 24

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

26 NS EW UD NS N EW Orbit of displacement 26

27 [1] Banking facility SRC structure -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 , N0.43,

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 lead damper steel 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 (1995 Kobe earthquake)

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


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