TOMIZAWA TETSUYA    Department   Undergraduate School  , School of Science and Technology    Position   Associate Professor
Date	2012/05
Country of Awarding	Japan
Authority to Grant	Architectural Institute of Japan
Award Name	The Prize of AIJ 2012, Building Engineering Division
Title	Development of the Three-dimensional Seismic Isolation System and Application for the Apartments
Award Winner(s)	Osamu TAKAHASHI, Tetsuya TOMIZAWA, Junji SUHARA, Ryoichiro MATSUMOTO
Award Type	Award at Domestic Conference, Meeting or Symposium
Details	The awarded three companies have worked collaboratively, and successfully developed a three-dimensional seismic isolation system, which reduces not only horizontal seismic movement, but also vertical one. This system comprises two main elements, a three-dimensional seismic isolation device and a rocking motion suppressing oil damper. The former device consists of three components, i.e. a laminated rubber bearing, air springs, and shearing force sliders. The awarded technology is a combination of the three-dimensional seismic isolation system and its world’s first application to CHISUI-KAN, a residential building completed in March 2011. The observed record at CHISUI-KAN proves that at the time of the 2011 off the Pacific coast of Tohoku Earthquake, the isolation system reduced the seismic acceleration by 44% horizontally, and by 28% vertically. Owning to its high performance and efficiency, the three-dimensional seismic isolation system is found significantly useful for important facilities such as hospitals, shelters, data centers, etc.