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Design of Seismic Isolated Tall Building with High Aspect-Ratio
Kikuchi, Takeshi,Takeuchi, Toru,Fujimori, Satoru,Wada, Akira Council on Tall Building and Urban Habitat Korea 2014 International journal of high-rise buildings Vol.3 No.1
When seismic isolation system is applied to high aspect-ratio (height/wide-ratio) steel structures, there are several problems to be taken into consideration. One is lifting up tensile force on the isolation bearing by overturning moment caused by earthquake. Another is securing building stiffness to produce seismic isolation effects. Under these conditions, this paper reports the structural design of high-rise research building in the campus of Tokyo Institute of Technology. With the stepping-up system for the corner bearings, the narrow sides of single span framework are designed to concentrate the dead load as counter-weight for the tensile reaction under earthquake. Also we adopted concrete in-filled steel column and Mega-Bracing system covering four layers on north & south framework to secure the horizontal stiffness of the building.