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Semi-active Hydraulic
(SHD)
Control computers and
Uninterruptible power supply
Figure 7. Kajima Shizuoka building configured with semiactive hydraulic dampers
(Story)
(Story)
5
—•— EL50
--4-TF50 !
--D--HA50 I
-o--Tokai
v t-^ 1/200 J
2000 4000 6000 8000 (kN)
Maximum shear force
(a) w/ control
2 4 6 8 10 (cm)
Maximum story drift
(b) w/o control
Figure 8. Maximum responses (El Centro, Taft and Hachinohe waves
with 50 cm/sec, and assumed Tokai waves)
structural protection. One of these structures, the Kajima K-Tower, is a 172 m tall, 38-story hotel and
office complex installed with 88 semi-active dampers and 2 hybrid mass dampers (see Fig. 10). In the
Roppongi area of Tokyo, the Kajima R-Building, a 54-story building with 356 variable-orifice dampers
and 192 passive dampers distributed throughout, has recently been completed (see Fig. 11). Altogether,
the Kajima Corporation is currently constructing or has recently finished 9 buildings in Japan that
employ semi-active hydraulic dampers for structural protection. Table 1 provides a summary of these 9
buildings (Kobori 2002). When these projects are completed, a total of more than 777 variable-orifice
dampers will be installed in building structures in Japan.