Middle-Story Isolated Structural System of High-Rise Building
Yasuhiro Tsuneki1, Shingo Torii2, Katsuhide Murakami3, and Toshiyuki Sueoka3
1Principal, Structural Engineering Department, Nikken Sekkei
2Head, Structural Engineering Section, Nikken Sekkei
3Chief Structural Engineer, Nikken Sekkei
For buildings of normal earthquake-resistant construction, it is essential to provide their structural frame with sufficient rigidity and strength horizontally and vertically, ensuring a uniform distribution of rigidity and strength in the plane. To this end, it is typical that those buildings adopt the same type of construction and structural system. On the other hand, in buildings of general base-isolation construction, their upper structure, which is supported by a base isolation layer, undergoes lessened seismic forces and therefore is able to tolerate concentration of rigidity and strength. This makes them available for construction with any types of structural systems, which in turn allows new structural planning realizing a greater freedom in architectural design; the same type of construction and structural system for the upper structure is generally adopted. In contrast, when a high-rise building is provided with an isolation layer in an intermediate level, its upper structure, which is placed above the isolation layer, has high seismic resistance as a seismic isolation structure. And a mass damper effect contributes to decrease in seismic responses in the lower structure, ensuring high seismic resistance of a building. This paper describes the physical properties of a seismic isolation layer system which is built at an middle-story of a building. It also introduce buildings by which potentials for new architectural planning are proposed through the use of this system.
-  Katsuhide Murakami, Haruyuki Kitamura, Hitoshi Ozaki, and Tomohiko Yamanashi, “DESIGN OF A BUILDING WITH SEISMIC ISOLATION SYSTEMAT THEMID-STORY,” AIJ J.Technol Des, Dec. 1998.
-  Katsuhide Murakami, Haruyuki Kitamura, and Yutaka Mastushima, “The Prediction for Seismic Responses of the Two-mass Model with the Mid-story Isolati on System,” Journal of Structural and Construction Engineering of AIJ, No.549, Nov. 2001.
-  Toshiyuki Sueoka, Shingo Torii, and Yasuhiro Tsuneki, “The application of response control design using middle-story isolation system to high-rise building,” 13th World Conference on Earthquake Engineering, Aug. 2004.
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