Takewaki Tsuji Lab.takewaki-lab.archi.kyoto-u.ac.jp/takewaki_tsuji_lab/pdf/...(shear strain of 0.5%)...
Transcript of Takewaki Tsuji Lab.takewaki-lab.archi.kyoto-u.ac.jp/takewaki_tsuji_lab/pdf/...(shear strain of 0.5%)...
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Kyoto University Global COE “Human Security Engineering”
1
Post‐tensioning Damper System for Micro‐vibration Reduction in Houses
Takewaki‐Tsuji Lab.
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Kyoto University Global COE “Human Security Engineering”
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Outline of research
Traffic and wind vibrationHabitability
Earthquake and windSafety
New vibration control system
Theoretical investigation and experimental test
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Kyoto University Global COE “Human Security Engineering”
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Asian Cities
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Background and purpose of research• Need of micro‐vibration reduction in houses• Proposal of low‐cost and handy system• Clarification of control mechanism• Proposal of simple analysis model• Experimental investigation (1/3 scale)• Use of High‐hardness rubber damperSufficient damping even in small deformation range (shear strain of 0.5%)
Experimental results (5mm thickness)
-0.1
-0.05
0
0.05
0.1
-0.15 -0.1 -0.05 0 0.05 0.1 0.15Reaction force[kN]
Deformation[mm]
2.0Hz0.5%
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Proposed vibration‐control system• Sufficient damping of high‐hardness rubber damper even in small deformation range
• Avoidance of mechanical looseness via post‐tensioning brace
beam
column
setting of damper brace
drift for damper deformation
damper unit• High effectiveness• Stable deformation
brace
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Clarification of damper mechanism
• Member stiffness(brace and rubber damper)
• Eccentricity of brace
• Brace angle
• Post‐tensioning force
No brace eccentricity
Brace angle
Principal parameters
Eccentricity
Detailed model Simple model
D
S
D
SS
D
rotaion
250*125*6 / 9H
150*150*9B10SR
60°
60°3000
6000
250*125*6 / 9H
150*150*9B10SR
60°
60°3000
600075
276
300
75
276
300
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Kyoto University Global COE “Human Security Engineering”
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Effective deformation ratio
DS
=Interstory
drift
Damper displacement
Effective deformation ratio
D
S
D
S
SD
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0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0 50 100 150 200
ブレース材取り付け角θ 60° ポストテンションP 7000N
±0mm
-20mm
-50mm
+20mm
+50mm
±0mm(MIDAS)
-20mm(MIDAS)
-50mm(MIDAS)
+20mm(MIDAS)
+50mm(MIDAS)
実効
率(高
硬度
ゴム
変形
量D
/建
物骨
組変
形量
S)
高硬度ゴムせん断ひずみ(%)
Simulation result
0
0.2
0.4
0.6
0.8
1
0 1 2 3 4 5
5mm10mm20mm
実効
率
層間変位[mm]
0
0.2
0.4
0.6
0.8
1
0 1 2 3 4 5
30°45°60°70°
実効
率
層間変位[mm]
Influence of brace angle Influence of brace size (diameter)Inter-story drift [mm]ef
fect
ive
defo
rmat
ion
ratio
effe
ctiv
e de
form
atio
n ra
tio
0
510
1520
25
30
35
40
-40 -30 -20 -10 0 10 20 30 40
取付け角60°,層間変位1mm時
実効
率
ズレ量[mm]
effe
ctiv
e de
form
atio
n ra
tio
Eccentricity [mm] effe
ctiv
e de
form
atio
n ra
tio
Inter-story drift [mm]
Influence of brace eccentricity Comparison between detailed and simple model
Damper shear strain
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1/3‐scale experiment
• Brace angle=60°• Brace eccentricity=0,30,100mm• Brace diameter=φ6• Post‐tensioning is determined so that compressive‐side brace
does not enter compressive region and tensile‐side brace does not yield
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Initial state
Frame displacement 3mm
Test specimen
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0
1
2
3
4
5
6
0 1 2 3 4 5 6
-10mm
0mm
+30mm
実効
率
フレーム変位[mm]
Simulation result
0
1000
2000
3000
4000
5000
6000
0 1 2 3 4 5 6
ダンパー1枚ダンパー2枚フレームのみ
水平
載荷
荷重
[N]
フレーム変位[mm]
0
500
1000
1500
2000
2500
3000
0 1 2 3 4 5 6
-10mm(圧縮)±0mm(圧縮)+30mm(圧縮)-10mm(引張)±0mm(引張)+30mm(引張)
軸力
[N]
フレーム変位[mm]
-0.08
-0.06
-0.04
-0.02
0
0.02
0 1 2 3 4 5 6
-10mm(2枚)
±0mm(2枚)
+20mm(2枚)
+30mm(2枚)
ダン
パー
ユニ
ット
回転
角[r
ad]
フレーム変位[mm]
damper deformation [mm] frame deformation [mm]
frame deformation [mm]frame deformation [mm]
rota
tion
angl
e [ra
d]br
ace
axia
l for
ce [N
]
horiz
onta
l for
ce [N
]da
mpe
r def
orm
atio
n [m
m]
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Experimental result
-1000
-500
0
500
1000
-6 -4 -2 0 2 4 6
10%50%100%
200%
せん
断力
[N]
ダンパー相対変位[mm]
-6000
-4000
-2000
0
2000
4000
6000
-8 -6 -4 -2 0 2 4 6 8
10%
50%100%
200%
水平
載荷
荷重
[N]
フレーム変位[mm]
-8
-6
-4
-2
0
2
4
6
8
-8 -6 -4 -2 0 2 4 6 8
10%50%100%
200%
ダン
パー
相対
変位
[mm
]
フレーム変位[mm]
0
500
1000
1500
2000
-8 -6 -4 -2 0 2 4 6 8
10%(圧縮)50%(圧縮)100%(圧縮)200%(圧縮)
ブレ
ース
軸力
[N]
フレーム変位[mm]frame deformation [mm] frame deformation [mm]
frame deformation [mm]
shea
r for
ce [N
]br
ace
axia
l for
ce [N
]
dam
per d
efor
mat
ion
[mm
]ho
rizon
tal f
orce
[N]
damper deformation [mm]
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Future issues• Proposal of design method including proposed vibration control system
• Dual resistance for small and large amplitudes
Series solution
• Tensegrity solution of post‐tensioning force