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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.
Kyoto University Global COE “Human Security Engineering”
2
Outline of research
Traffic and wind vibrationHabitability
Earthquake and windSafety
New vibration control system
Theoretical investigation and experimental test
Kyoto University Global COE “Human Security Engineering”
3
Asian Cities
Kyoto University Global COE “Human Security Engineering”
4
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%
Kyoto University Global COE “Human Security Engineering”
5
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
Kyoto University Global COE “Human Security Engineering”
6
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
Kyoto University Global COE “Human Security Engineering”
7
Effective deformation ratio
DS
=Interstory
drift
Damper displacement
Effective deformation ratio
D
S
D
S
SD
Kyoto University Global COE “Human Security Engineering”
8
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
Kyoto University Global COE “Human Security Engineering”
9
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
Kyoto University Global COE “Human Security Engineering”
10
Initial state
Frame displacement 3mm
Test specimen
Kyoto University Global COE “Human Security Engineering”
11
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]
Kyoto University Global COE “Human Security Engineering”
12
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]
Kyoto University Global COE “Human Security Engineering”
13
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
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