Seismic Performance of Base Isolation Buildings during 2003 Off Tokachi Earthquake Taiki SAITO...
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Transcript of Seismic Performance of Base Isolation Buildings during 2003 Off Tokachi Earthquake Taiki SAITO...
Seismic Performance of Base Isolation Buildings during 2003 Off Tokachi Earthquake
Taiki SAITO
Building Research Institute, JAPAN
( [email protected] ) 1
Outline
2003 Off Tokachi Earthquake Characteristics of earthquake Damage photos
Earthquake response of base isolation buildings Government building Office building Hospital Bank
Summary
2
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
JMA Intensity Map
(Data: JMA) 4
Damage by Tsunami after the earthquake
(Photos from Hokkaido Journal) 5
Damage of roads
(Photos from Hokkaido Journal) 6
Damage of buildings
(Photos from Hokkaido Journal) 7
Damage of buildings
(Photos from Hokkaido Journal) 8
Damage of Oil Tank
(Photos from Hokkaido Journal)
Natural Period for Sloshing= 7 sec
Tomakomai City (220 km from Epicenter)
9
Effect of long period earthquake
(Data: Disaster Prevention Research Center)
7 sec
Contour Map for Response Velocity (T=7 sec)
Earthquake Velocity Wave (0.05-0.5Hz)
Tomakomai
10
Base isolation buildings in Kushiro city
140°
140°
141°
141°
142°
142°
143°
143°
144°
144°
145°
145°
146°
146°
38° 38°
39° 39°
40° 40°
41° 41°
42° 42°
43° 43°
44° 44°
0 100 200
km
HRO
HKU
HKD
HCN, HCN2
MYKAKT
THU
HRH
KGC
Mainshock09/26 04:50M8.0, h=42kmAftershock
09/26 06:08M7.1, h=21km
11
[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
Allocation of base isolation devices
0 5 10m
N
01F, 09F B1F
33 m29
mGL, G10, G34
0 10 20 m
G34
G10
GL
B1F
01F
09F
29 m
64 Natural rubber bearings, 56 lead dampers and 32 steel dampers
Sensor
13
Observed records
Acceleration
-300
0
300
Acc
. (c
m/s
/s)
257-09F (peak: 120.6 cm/s/s)
-300
0
300
Acc
. (c
m/s
/s)
257-01F (peak:- 80.6 cm/s/s)
-300
0
300
Acc
. (c
m/s
/s)
257-B1F (peak: 192.4 cm/s/s)
-300
0
300
Acc
. (c
m/s
/s)
257-GL (peak:- 259.8 cm/s/s)
-300
0
300
Acc
. (c
m/s
/s)
257-G10 (peak: 214.4 cm/s/s)
-300
0
300
Acc
. (c
m/s
/s)
0 10 20 30 40 50 60 70 80 90 100 110 120Time (sec)
257-G34 (peak: 134.5 cm/s/s)
Place
Maximum Acc,(cm/s2)
N167°E N257°EUD
Building
09F 93.8 120.6 183.6
01F 70.3 80.6 85.1
B1F 154.1 192.4 76.4
Ground
GL 210.2 259.8 106.3
G10 173.3 214.4 71.9
G34 137.6 134.5 61.5
14
Distribution of max. acceleration response
-40
-30
-20
-10
0
10
20
30
40
0 100 200 300
Peak Acc. (cm/s/s)
Hei
ght
(m)
Ground N167E
Ground N257E
Building N167E
Building N257E
09F
01F
B1F
GL
G10
G34
15
Orbit of displacement
-15
0
15
-15 0 15Disp (cm)
Dis
p. (
cm)
N
0 5 10m
N
01F, 09F B1F
33 m
29m
GL, G10, G34
16
[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
Allocation of base isolation devices
1
A
2
B
X
Y
Base Isolator : 600 φ
▽
装置芯 装置芯 ▽ Basement Sensor
1FL Sensor
RFL Sensor
Scratch Board
4 Lead rubber bearings
18
Base isolation devices
Lead rubber bearing
19
Distribution of max. acceleration response
0 100 200 300
X(EW)Y(NS)
(Gal)Input
1FL
RFL
0 20 40 60 80 100-300
0
300
(sec)
(Gal)
0 20 40 60 80 100-300
0
300
(sec)
(Gal)
X (EW) Y (NS) UD
RFL 228 141 -
1FL 229 129 -
BasementInput 286 274 114
0 20 40 60 80 100-300
0
300
(sec)
(Gal)
20
Orbit of displacement
-40 -30 -20 -10 0 10 20 30-20
-10
0
10
20(cm)
(cm)
X(EW)
Y (NS)
21
[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
Allocation of base isolation devices
50 High damping rubber bearings
23
Observed records
.UD基礎
-250
0
250
0 50 100 150Time (sec)
Acc
. (c
m/s
2 )
.NS基礎
- 250
0
250
0 50 100 150Time (sec)
Acc
. (c
m/s
2 )
.EW基礎
- 250
0
250
0 50 100 150
Time (sec)
Acc
. (c
m/s
2 ) MAX=212cm/ s2
MAX=142cm/ s2
MAX=100cm/ s2
.NS1階
- 250
0
250
0 50 100 150Time (sec)
Acc
. (c
m/s
2)
.EW1階
- 250
0
250
0 50 100 150Time (sec)
Acc
. (c
m/s
2 ) MAX=155cm/ s2
MAX=123cm/ s2
.UD1階
- 250
0
250
0 50 100 150
Time (sec)
Acc
. (c
m/s
2)
MAX=145cm/ s2
MAX= 212 cm/s2 (EW)
MAX= 142 cm/s2 (NS)
MAX= 100 cm/s2 (UD)
MAX= 155 cm/s2 (EW)
MAX= 123 cm/s2 (NS)
MAX= 145 cm/s2 (UD)
24
Distribution of max. acceleration response
0 100 200 300
EWNS
RF
3F
2F
1F
BF
25
-15
0
15
20 40 60 80 100 120Time (sec)
Rel
. Dis.
cm)
(
EW
-15
0
15
20 40 60 80 100 120Time (sec)
Rel
. Dis.
cm)
(
NS
-1.0
0.0
1.0
20 40 60 80 100 120Time (sec)
Rel
. Dis.
cm)
(
UD
MAX=13.1cm
MAX=9.8cm
MAX=0.27cm
NS
EW
UD
NS
- 15.0
- 10.0
- 5.0
0.0
5.0
10.0
15.0
- 15.0 - 10.0 - 5.0 0.0 5.0 10.0 15.0
→ (cm)東西方向変位 【東 】
→
cm
南北
方向
変位
【北】
()
N
EW
Orbit of displacement
26
[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
Allocation of base isolation devices
15 Natural rubber bearings, 11 lead dampers, and 6 steel dampers
28
Base isolation devicesnatural rubber bearing
lead dampersteel damper
29
- 500- 400- 300- 200- 100
0100200300400500
- 6 - 4 - 2 0 2 4 6
Drift (cm)
Load
(ton
f)Experiment
Estimation
Characteristics of base isolation devices
30
BF X- dir. (max 172)
- 250
0
250
0 10 20 30 40 50 60sec.
gal
1F X- dir. (max 141)
- 250
0
250
0 10 20 30 40 50 60sec.
gal
Acceleration response (X-direction)
31
BF Y- dir. (max 222)
- 250
0
250
0 10 20 30 40 50 60sec.
gal
1F Y- dir. (max 162)
- 250
0
250
0 10 20 30 40 50 60sec.
gal
Acceleration response (Y-direction)
32
Basement Drift
- 20
0
20
- 20 0 20cm
cm
Y
X
Observed Basement Drift
- 20
0
20
0 10 20 30 40 50 60sec.
cm
X (max 14cm)Y (max 11cm)
Orbit of displacement
33
0
50
100
150
200
250
300
350
1-X 1-Y 2-X 2-Y 3-X 3-Y 4-X 4-Y I-X I-Y II-X II-Y
Max
. Acc
. (cm
/s2)
BF1F
Summary of base isolation effect
34
1 2 3 4 (1995 Kobe earthquake)
0.45 0.42
0.80
0.470.73
0.870.82
0.73
0.35
0.22
0.95
0.54
-15
0
15
-15
0
15
Dis
p (cm
)
Disp. (cm)
N
Basement Drift
- 20
0
20
- 20 0 20cmcm
Y
X
- 15.0
- 10.0
- 5.0
0.0
5.0
10.0
15.0
- 15.0 - 10.0 - 5.0 0.0 5.0 10.0 15.0
→ (cm)東西方向変位 【東 】
→
cm
南北
方向
変位
【北】
()
N-40 -30 -20 -10 0 10 20 30
-20
-10
0
10
20(cm)
(cm)
Summary of displacement
Building 1 Building 2
Building 3 Building 4
35