Base Isolation Technology November, 2000 Principle of Base Isolation System Example of Base-isolation Building Analytical Model of Base-isolation Buil Input Earthquake Waves Results of Earthquake Response Analyses 1
Dec 18, 2015
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
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Principle of Base Isolation System
Base Isolation System is like a Suspension System of Motorcar
Soft spring + Oil Damper
Damper Laminated rubber bearing
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To Back
Laminated rubber bearing
Soft in Horizontal directionHard in Vertical direction
Rubber Sheet
Steel Plate
Base Isolation System
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Base Isolation System
Laminated rubber bearing
Rubber block
Rubber block
Laminated rubber bearing
1. Vertical direction
2. Horizontal direction
Principle of Laminated rubber bearing
Rubber block
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To TOP
Steel damper
Lead damper
Base Isolation System Damper
Oil damper
Friction damper with Coned disc springs
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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
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OBAYASHI77
Example of Base-isolation Building
Base Isolated Research Building (Elevation)
Base Isolation Device (Floor Plan)
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Rubber BearingSteel Damper
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Base Isolation Building
Principle
Seismic Acceleration Response Spectrum
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Comparison of Seismic Response
Am
pli f
icat
ion
fact
or o
f ac
c ele
r atio
n
Period(sec.)
Conventional Building
Base Isolation Building
Story Displacement Acceleration Story Displacement Acceleration
El Centro 1940NS25Kine Input
Base Isolation System
OBAYASHI99
Analytical Model of Base-isolation Building
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Story Weight Total Horizontal Natural NaturalWeight stiffness Frequency period
Floor W ton W ton KH ton/cm Hz sec6F 543 543
415 1 mode 0.754 1.3265
5F 412 955415 2 mode 2.598 0.3849
4F 412 1,367455 3 mode 4.948 0.2021
3F 422 1,789518 4 mode 7.189 0.1391
2F 414 2,203615 5 mode 8.985 0.1113
1F 705 2,90881.36 6 mode 10.341 0.0967
Mode
EigenvalueAnalytical Model
4.2m
4.2m
4.25m
4.3m
4.3m
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0.5mRubber Bearing Steel Damper
5
4
3
2
1
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Analytical Model of Base-isolation Building
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Hysteresis Characteristics
0
100
200
300
400
500
600
0.0 1.0 2.0 3.0 4.0 5.0
Displasement(cm)
1F(Base-isolation)6F
5F
4F
3F
2F
OBAYASHI
Input Earthquake Waves
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KOBENS(818gal)
DZCEW(369gal)
YPTNS(321gal)
-1000
-500
0
500
1000
0 5 10 15 20 25
Inpu
t Acc
.(ga
l)
Time (sec.)
-400-300-200-100
0100200300400
0 5 10 15 20 25
Inpu
t Acc
.(ga
l)
Time (sec.)
-400-300-200-100
0100200300400
0 20 40 60 80 100
Inpu
t Acc
.(ga
l)
Time (sec.)
OBAYASHI1212
Effectiveness of Base Isolation System
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DZCEW369gal YPTNS321gal
0
1
2
3
4
5
6
0 200 400 600 800 1000
Acceleration Distribution (DZCEW)
ConventionalBase-isolation
story
gal0
1
2
3
4
5
6
0 200 400 600 800 1000
Acceleration Distribution (YPTNS)
ConventionalBase-isolation
story
gal
OBAYASHI1313
Results of Earthquake Response Analyses
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Response Acceleration Story Displacement
0
1
2
3
4
5
6
0 5 10 15 20 25
KOBENS 818galDZCEW 369galYPTNS 321gal
story
cm 0
1
2
3
4
5
6
0 5 10 15 20 25
KOBENS 818galDZCEW 369galYPTNS 321gal
story
cm
OBAYASHI14
-1000
-500
0
500
1000
0 5 10 15 20 25Time (sec.)
KOBENS(818gal)
DZCEW(369gal)
YPTNS(321gal)
Results of Earthquake Response Analyses
-1000
-500
0
500
1000
0 5 10 15 20 25
KOBENS Base-isolation
Acc.(gal)
(sec.)
-400-300-200-100
0100200300400
0 5 10 15 20 25
DZCEW Base-isolation
Acc.(gal)
(sec.)
-400-300-200-100
0100200300400
0 10 20 30 40 50 60
YPTNS Base-isolation
Acc.(gal)
(sec.)
OBAYASHI1515
Results of Earthquake Response Analyses
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Hysteresis Characteristics
0
100
200
300
400
500
600
0.0 1.0 2.0 3.0 4.0 5.0
Displasement(cm)
1F(Base-isolation)6F
5F
4F
3F
2F
OBAYASHI1616
Results of Earthquake Response Analyses
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-600
-400
-200
0
200
400
600
-30 -20 -10 0 10 20 30
1F2F3F4F5F6F
Shere Force (ton)
Displasement (cm)
-600
-400
-200
0
200
400
600
-30 -20 -10 0 10 20 30
1F2F3F4F5F6F
Shere Force (ton)
Displasement (cm)
DZCEW YPTNS
Hysteresis Characteristics
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Effects of Base Isolation System
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Building with Seismic Isolation
Conventional Building
・ Improvement for Safety of Building・ Keep for Function of Building・ Preservation for Property
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Application of Base-isolated Structure
1) Government and Municipal Office, Fire Station, Police Station, Broadcasting Station2) Hospital, Social welfare facilities3) Laboratory4) Computer Center5) Museum, Gallery, Library6) Apartment House7) Cultural Asset, Historic Structure
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