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- 저자 : Toshiyuki Kitada (검색결과 4 건)
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Masahide Matsumura,Yasuyuki Nakanishi,Toshiyuki Kitada 한국강구조학회 2008 International Journal of Steel Structures Vol.8 No.4
Understanding of a dynamic responses of structure subjected to an earthquake motion is a key in evaluating a structural safety against the earthquake. In the analysis, some assumptions onto material properties such as stress-strain relationship of material, damping properties and so on are employed. While in the shaking table test these assumptions are included into the test results except for some items due to a specimen size. Then in steel column with a squash loading on the top of the column through comparisons between the shaking table test using a smaller size specimen and the dynamic response analysis of the specimen. It is concluded that both the analytical and experimental results indicate a good agreement when an accurate analytical model, which details the cross-sectional profile of the specimen and the material properties, is prepared.
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Probabilistic analysis of buckling loads of structures via extended Koiter law
Kiyohiro Ikeda,Makoto Ohsaki,Kentaro Sudo,Toshiyuki Kitada 국제구조공학회 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.32 No.1
Initial imperfections, such as initial deflection or remaining stress, cause deterioration of buckling strength of structures. The Koiter imperfection sensitivity law has been extended to describe the mechanism of reduction for structures. The extension is twofold: (1) a number of imperfections are considered, and (2) the second order (minor) imperfections are implemented, in addition to the first order (major) imperfections considered in the Koiter law. Yet, in reality, the variation of external loads is dominant over that of imperfection. In this research, probabilistic evaluation of buckling loads against external loads subjected to probabilistic variation is conducted by extending the concept of imperfection sensitivity. A truss arch subjected to dead and live loads is considered as a numerical example. The mechanism of probabilistic variation of buckling strength of this arch is described by the proposed method, and its reliability is evaluated.
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Probabilistic analysis of buckling loads of structures via extended Koiter law
Ikeda, Kiyohiro,Ohsaki, Makoto,Sudo, Kentaro,Kitada, Toshiyuki Techno-Press 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.32 No.1
Initial imperfections, such as initial deflection or remaining stress, cause deterioration of buckling strength of structures. The Koiter imperfection sensitivity law has been extended to describe the mechanism of reduction for structures. The extension is twofold: (1) a number of imperfections are considered, and (2) the second order (minor) imperfections are implemented, in addition to the first order (major) imperfections considered in the Koiter law. Yet, in reality, the variation of external loads is dominant over that of imperfection. In this research, probabilistic evaluation of buckling loads against external loads subjected to probabilistic variation is conducted by extending the concept of imperfection sensitivity. A truss arch subjected to dead and live loads is considered as a numerical example. The mechanism of probabilistic variation of buckling strength of this arch is described by the proposed method, and its reliability is evaluated.
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