Mitigation of Motions of Tall Buildings with Specific Examples of ...

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77.6 m Tokyo International Airport Tower at Haneda in 1993, as shown in Figure 15. The 1400 shallow circular cylindrical vessels with 60 cm diameter and 12.5 cm height had injection taps and handles to serve as projections and 4 conical dents on the upside and base. These projections and dents provide additional stiffness for stacking the polyethylene vessels. During an actual storm, data revealed that the 22.7 kg TSD application raised the damping ratio to 1%, peaking at 7.6% as the rms acceleration grew (Tamura et al. 1996). Figure 15: Tokyo International Airport Tower (TIAT) at Haneda and views of TLD units . installed (taken from Tamura et al. 1996). 6.3 m Air traffic control room Mitigation of Motions of Tall Buildings with Specific Examples of Recent Applications 18 TLD 0.6 m 77.6 m 0.6 m 22 m 0.125 m
In addition to the various installations of TSDs, there are also some applications of TLCD technologies, including those with period adjustment mechanisms. By equipping a Tuned Liquid Column Damper with Period Adjustment Equipment (LCD-PA), the behavior of the liquid motion in the liquid column damper may be regulated. Such a system has been installed in the top floor of the 26 story Hotel Cosima, now called Hotel Sofitel (Figure 16) in Tokyo. The LCD-PA consists of a rectangular, U-shaped tank, a pair of air rooms, and period adjustable equipment, as shown in Figure 16. When the tank is moved in the horizontal direction, fluid travels in both the vertical and horizontal directions. Thus, in one side, the air is compressed, while in the other chamber, the air pressure is reduced. The sinusoidal pressure fluctuations induce fluid movement in the subsidiary U-shaped tank, resulting in the movement of the valve and shaft and movements in the springs. The device inserted in the hotel is a rectangular based bidirectional LCD with four PA’s and a total weight of 58 tons and effective liquid weight of 36 tons. The tank has a portion where liquid is free to move in any horizontal direction, four vertical reservoirs (VR) at each corner above the horizontal partition, and four air chambers separated by partitions. The PA is arranged between the two vertical reservoirs (Shimizu & Teramura 1994). The system has been observed to reduce the maximum acceleration to 50-70% of its original values and the rms acceleration to 50%, as well (Shimizu & Teramura 1994). Shanghai World Financial Center, shown earlier in Figure 9, is also to be equipped with eight TSD units at its 91st floor upon its completion sometime in 2001 (Wakahara et al. 1998). Each tank will be 7.5 m in diameter, separated into 6 layers. The installation of the 800 ton TSD system (1% mass ratio) is anticipated to successfully reduce story drift and peak and rms accelerations to acceptable limits, when compared to ISO stan- Figure 16: Cosima Hotel and sectional view of the LCD-PA concept with detail of period adjusting mechanism (taken from Shimizu & Teramura Mitigation of Motions of Tall Buildings with Specific Examples of Recent Applications 19
Page 1 and 2: Mitigation of Motions of Tall Build
Page 3 and 4: esult, numerous studies have been d
Page 5 and 6: 3.1 Outrigger Systems The use of ou
Page 7 and 8: 3.3 Tube Systems Figure 5. Sears To
Page 9 and 10: Still, there is no definitive conse
Page 11 and 12: 6.0 Auxiliary Damping Sources Unlik
Page 13 and 14: Table 4. Mass support mechanisms an
Page 15 and 16: Another pioneering application of T
Page 17: Figure 14: Shin Yokohama Prince Hot
Page 21 and 22: These pioneering applications prove
Page 23 and 24: Building. 6.2.3 Friction Systems Th
Page 25 and 26: In addition to these applications,
Page 27 and 28: Table 11. Applications of Metallic
Page 29 and 30: (a) (c) Figure 19: (a) Kyobashi Sie
Page 31 and 32: Table 14. Other Applications of AMD
Page 33 and 34: 15 reflects. The following section
Page 35 and 36: The TAD control system regulates th
Page 37 and 38: Wind tunnel tests and analytical st
Page 39 and 40: 6.6 Semi-Active Dampers Following e
Page 41 and 42: with the optimum control provided b
Page 43 and 44: Hayashida, H., Mataki, Y., and Y. I
Page 45 and 46: Kwok, K.C.S. and N. Isyumov. (July
Page 47 and 48: Soong, T.T. and G.F. Dargush. (1997

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