Advanced Technology

Environmental techniques

Seismic isolation, control and resistance technologies

Seismic isolation, control and resistance technologies are applicable to construction through retrofit phases and advance more in earthquake-prone Japan than in any other country .

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Seismically isolated buildings were first constructed in Japan in 1983. High seismic resistance was verified during the 1995 Great Hanshin-Awaji Earthquake, and the number of seismically isolated buildings increased rapidly.
At present, nearly 3000 seismically isolated buildings are in service. Various seismic isolation systems have been developed.
The seismic isolation effect was verified at the Sendai First Tower in the city of Sendai, Miyagi Prefecture in the event of the 2011 Great East Japan Earthquake.

Sendai First Tower
Two stories below ground level, 24 stories above ground level and a two-story penthouse.
Reinforced concrete and steel structures.
Total floor area: 29,385 m2
Building area: 1,978 m2
The column capital on the first basement floor has been seismically isolated.
Hybrid TASS system has been adopted.

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Measures are considered necessary in a jungle of buildings in the city center against long-period seismic motions. Special seismic response control systems made it possible to take measures to control long-period seismic motions without retrofitting the structure of existing high-rise buildings.

Shinjuku Center Building
Five stories below ground level, 55 stories above ground level and a three-story penthouse.
Total floor area: 183,093 m2
Steel structure above ground level.

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