seismic vibration control of a high-rise r.c. building …

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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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


42F40F

35F

30F

25F

20F

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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

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0 2 4 6 8 10

階


42F40F

35F

30F

25F

20F

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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



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.

seismic vibration control of a high-rise r.c. building …

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