SEISMIC VIBRATION CONTROL OF A HIGH-RISE R.C. BUILDING BY A LARGE TUNED MASS DAMPER
UTILIZING WHOLE WEIGHT OF THE TOP FLOOR
SEISMIC VIBRATION CONTROL OF A HIGH-RISE R.C. BUILDING BY A LARGE TUNED MASS DAMPER
UTILIZING WHOLE WEIGHT OF THE TOP FLOORA. Makino1, J. Imamiya1, N. Sahashi1
S05: JAEE Special Session
S05-02:Spectacular Projectsof Passively-ControlledBuildings
4. OUTLINE OF ISOLATION SYSTEM The isolation system under the view lounge consists of the following elements.
We have developed a long-stroke oil damper that can follow large displacements.
1. INTRODUCTIONThis paper outlines the design of the high-
rise building whose top floor is isolated and utilized as the mass of a large-scale mass damper, and describes the effect of the vibration control system realized by the design.
1 Takenaka Corporation, Japan
Photo 3
2. STRUCTURAL OUTLINEThe framing work is in a pure rigid-frame RC structure, and a double tube
structure is used, where columns are intensively laid out along the perimeter and around the center core.
1
Photo 1 Photo 2
1 1 1
Figure 5 Floor plan of view lounge
View lounge floor above
Core(Fixed)
4
3
2
1 ③ Restoring element① Supporting elementBase-isolator of laminated rubber bearing: 8 piecesSteel ball bearing panel
: 16 sheets
② Damping and control element ④ Protection against collisionOil damper for dumping: 8 pieces+ Oil damper for control: 8 pieces
Oil buffer: 8 pieces
3. OUTLINE OF LARGE-SCALE MASS DAMPERThe view lounge and helideck are individually base-isolated, which forms
a dual structure of seismic isolation. The weight of the view lounge accounts for about 2.2% of the building weight above the ground, and the weight of the helideck accounts for about 0.2%.
6. CONCLUSIONSufficient mass and a long stroke enable the mass damper to be practically
effective enough against large earthquakes. The natural vibration period of the mass damper should be set by considering the nonlinearity of the building.Figure 1 Building section
▼162.8m
▼5FL
▼43FL
Helideck
View lounge
Isolation floor
Residential
Core(Fixed)
Residential
Helideck1,862kN
Isolation floor for view lounge
Isolation floor for helideck
View lounge19,071kN
Expansion joint, one meter long
EV machine
Figure 4 Cross section of mass damper
32m8m 8m 8m 8m
7m
Double tube structure
Flat slabＸ
Ｙ
7m7m
7m28
m
Core(Fixed)
Expansion joint, one meter long
Helideck aboveFigure 3 Floor plan of view lounge
Figure 2 Framing plan of typical floor
0
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45
0 2 4 6 8 10
42F40F
35F
30F
25F
20F
15F
10F
5F
1F
0.0 2.0 4.0 6.0 8.0 10.0
Mass damper fixed T=3.8 sec. T=6.0 sec. T=8.0 sec.
0
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0 2 4 6 8 10
Mass damper fixed T=3.8 sec. T=6.0 sec. T=8.0 sec.
42F40F
35F
30F
25F
20F
15F
10F
5F
1F
0.0 2.0 4.0 6.0 8.0 10.0
Elastic analysis Elasto-plastic analysis(a) Input Wave – Random phase characteristics
Inter-story drift angle (x10-3rad), X-directionalInter-story drift angle (x10-3rad), X-directional
Floor Floor
0
5
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15
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0 2 4 6 8 10
階
Mass damper fixed T=3.8 sec. T=6.0 sec. T=8.0 sec.
42F40F
35F
30F
25F
20F
15F
10F
5F
1F
0.0 2.0 4.0 6.0 8.0 10.0
(b) Input Wave – Observed phase characteristicsElasto-plastic analysis
Inter-story drift angle (x10-3rad), X-directional
Floor
View lounge(Operated)
42F40F
35F
30F
25F
20F
15F
10F
5F
1F
Floor42F40F
35F
30F
25F
20F
15F
10F
5F
1F
0.0 2.0 4.0 6.0 8.0 10.0
Floor 42F40F
35F
30F
25F
20F
15F
10F
5F
1F
Floor
Mass damper fixedT=3.8secT=6.0secT=8.0sec
Mass damper fixedT=3.8secT=6.0secT=8.0sec
Mass damper fixedT=3.8secT=6.0secT=8.0sec
0.0 2.0 4.0 6.0 8.0 10.0 0.0 2.0 4.0 6.0 8.0 10.0
5. SEISMIC RESPONSE ANALYSISIn the analysis on an elastic building, the damper is the most effective when
the natural period of mass damper is set to the optimum value; 3.8sec which is theoretically estimated. On the other hand, when the building is elasto-plastic, it will have to be as longer as about 8 sec. to attain a sufficient damping effect.
