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RISS 인기검색어
- 검색키워드
- 저자 : Koichiro Ishikawa (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Effect of shear wall location in rigid frame on earthquake response of roof structure
Ishikawa, Koichiro,Kawasaki, Yoshizo,Tagawa, Kengo Techno-Press 2001 Structural Engineering and Mechanics, An Int'l Jou Vol.11 No.6
The purpose of this study is to investigate the effect of the shear wall location in rigid frames on the dynamic behavior of a roof structure due to vertical and horizontal earthquake motions. The study deals with a gabled long span beam supported by two story rigid frames with shear walls. The earthquake response analysis is carried out to study the responses of the roof: vibration mode, natural period, bending moment and horizontal shear force of the bearings. The study results in the following conclusions: First, a large horizontal stiffness difference between the side frames is caused by the shear wall location, which results in a large vertical vibration of the roof and a large shear force at the side bearings. Second, in this case, the seismic design method for ordinary buildings is not useful in determining the distribution of the static equivalent loads for the seismic design of this kind of long span structures.
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Correlation between Cr Distribution and Ferromagnetism in Iodine-Doped (Zn,Cr)Te
Nozomi Nishizawa,Koichiro Ishikawa,Shinji Kuroda,Koki Takita,Masanori Mitome,Yoshio Bando,Tomasz Dietl 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
zation measurements and structural and chemical characterizations were performed on a series of epitaxial lms grown by molecular beam epitaxy. The magnetic properties of (Zn,Cr)Te films were altered significantly by co-doping charge impurities or by changing Zn and Te flux supplies during epitaxy. The nano-scale probing of the constituent elements using energy-dispersive X-ray spectroscopy (EDS) revealed that the Cr distribution in the crystal was clearly correlated with the ferromagnetic properties and the origin of high-temperature ferromagnetism was the formation of nano-scale Cr-rich regions in inhomogeneous Cr distributions. As an origin of the variation of the uniformity of Cr distribution, it is proposed that the aggregation energy of Cr ions is modified by the deviation of the Cr charge state which is manipulated by the co-doping or the deviation from stoichiometry.
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Hiyama, Yujiro,Ishikawa, Koichiro,Kato, Shiro,Okubo, Shoji Techno-Press 2000 Structural Engineering and Mechanics, An Int'l Jou Vol.9 No.3
This study discusses on the experimental and analytical results of the global buckling tests, carried out on aluminum alloy double layer space grids composed of tubular members, ball joints and connecting bolts at the member ends, with the purpose of demonstrating the effectiveness of a simplified analysis method using an equivalent slenderness ratio for the members. Because very few experiments have been carried out on this type of aluminum space grids, the buckling behavior is investigated experimentally over the post buckling regions using several space grid specimen with various values for the member slenderness ratio. The observed behavior duping the experiments is compared with the analytically obtained results. The comparison is made based on two different schemes; one on the plastic hinge method considering a bending moment-axial force interaction for members and the other on a method using an equivalent slenderness ratio. It is confirmed that the equivalent slenderness method can be effectively applied, even in the post buckling regions, once the effects of the rotational rigidity at the ball joints are appropriately evaluated, because the rigidity controls the buckling behavior. The effectiveness of the equivalent slenderness method will be widely utilized for estimation of the ultimate strength, even in post buckling regions for large span aluminum space grids composed of an extreme large number of nodes and members.
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