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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.
Koichi Shigeno,Haruka Nishijima,Takeshi Souma,Hirotaka Fujimori 한국전기전자재료학회 2023 Transactions on Electrical and Electronic Material Vol.24 No.1
In this study, a single-phase quadruple perovskite oxide powder, Cu 3.21 Ti 1.16 Nb 2.63 O 12 , was synthesized, and the novel coexistence of Cu 2+ and Cu + was confirmed via X-ray photoelectron spectroscopy. We produced a dense, sintered body with a relative density of 96% by firing at 885 °C in air. The sintered body exhibited an electrical conductivity of 2.2 S/cm, a Seebeck coefficient of -280 μV/K, a thermal conductivity of 2.4 W/m K at 730 °C, and a relatively low dimensionless figure of merit ( ZT ) of approximately 0.006. The main reason for the low ZT was the low electrical conductivity, which was approximately 1/100 of that of Na 0.7 CoO 2 , which is a typical thermoelectrical oxide. However, the obtained ZT value was higher than that of similar CaCu 3 Ti 4 O 12 -based oxides, indicating the significant potential of the as-prepared perovskite oxide as a thermoelectric material. The electrical conductivity exhibited an Arrhenius-type temperature dependence above room temperature, and its activation energy was 0.1 eV, which was equivalent to that of CuO hopping conduction. This suggested that hopping conduction between Cu + and Cu 2+ plays a signifi cant role in the electrical conduction of this system. This study provides important insights for the development of new quadruple perovskite oxide thermoelectric materials.