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Simplified dynamic analysis of slender tapered thin-walled towers with additional mass and rigidity
Takabatake, Hideo,Mizuki, Akira Techno-Press 1995 Structural Engineering and Mechanics, An Int'l Jou Vol.3 No.1
A linearly tapered, doubly symmetric thin-walled closed member, such as power-transmission towers and tourist towers, are often characterized by local variation in mass and/or rigidity, due to additional mass and rigidity. On the preliminary stage of design the closed-form solution is more effective than the finite element method. In order to propose approximate solutions, the discontinuous and local variation in mass and/or rigidity is treated continuously by means of a usable function proposed by Takabatake(1988, 1991, 1993). Thus, a simplified analytical method and approximate solutions for the free and forced transverse vibrations in linear elasticity are demonstrated in general by means of the Galerkin method. The solutions proposed here are examined from the results obtained using the Galerkin method and Wilson-${\theta}$ method and from the results obtained using NASTRAN.
Effects of dead loads on the static analysis of plates
Takabatake, Hideo Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.42 No.6
The collapse of structures due to snow loads on roofs occurs frequently for steel structures and rarely for reinforced concrete structures. Since the most significant difference between these structures is related to their ability to handle dead loads, dead loads are believed to play an important part in the collapse of structures by snow loads. As such, the effect of dead loads on displacements and stress couples produced by live loads is presented for plates with different edge conditions. The governing equation of plates that takes into account the effect of dead loads is formulated by means of Hamilton's principle. The existence and effect of dead loads are proven by numerical calculations based on the Galerkin method. In addition, a closed-form solution for simply supported plates is proposed by solving, in approximate terms, the governing equation that includes the effect of dead loads, and this solution is then examined. The effect of dead loads on static live loads can be explained explicitly by means of this closed-form solution. A method that reflects the effects of dead loads on live loads is presented as an example. The present study investigates an additional factor in lightweight roof structural elements, which should be considered due to their recent development.
The Idea of politeia: its Role and Destiny
( Sumio Takabatake ) 한국서양고대역사문화학회(구 한국서양고대사학회) 2020 서양고대사연구 Vol.59 No.-
A history of the idea of politeia in Greek world especially in Athens is followed. In section 1 (The beginning of the politeia) Solon is mainly analyzed, in section 2 (The politeia in Athens) a question if Athens forced democracy on the other poleis is tackled first and then clarification of pseudo-Xenophon, Athenaion Politeia is achieved. In section 3 (Antiphon and the politeia) Antiphon's thinking on the politeia is pursued from the scanty sources and his not believing in its omnipotent power is made clear. In section 4 (Aeneas Tacticus and the politeia) the relationship between Aeneas and the idea of politeia and conclusion is drawn that the idea played little role for him.
Effects of dead loads on the static analysis of plates
Hideo Takabatake 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.42 No.6
The collapse of structures due to snow loads on roofs occurs frequently for steel structures and rarely for reinforced concrete structures. Since the most significant difference between these structures is related to their ability to handle dead loads, dead loads are believed to play an important part in the collapse of structures by snow loads. As such, the effect of dead loads on displacements and stress couples produced by live loads is presented for plates with different edge conditions. The governing equation of plates that takes into account the effect of dead loads is formulated by means of Hamilton’s principle. The existence and effect of dead loads are proven by numerical calculations based on the Galerkin method. In addition, a closed-form solution for simply supported plates is proposed by solving, in approximate terms, the governing equation that includes the effect of dead loads, and this solution is then examined. The effect of dead loads on static live loads can be explained explicitly by means of this closed-form solution. A method that reflects the effects of dead loads on live loads is presented as an example. The present study investigates an additional factor in lightweight roof structural elements, which should be considered due to their recent development.
Recycle utilization of waste sawdust substrate for sawdust based cultivation of Hericium erinaceum
Koji Takabatake 한국버섯학회 2010 한국버섯학회지 Vol.8 No.4
The waste substrate from sawdust based cultivation of Heicium erinaceum was reused. This process was conducted three times. Even when the waste substrate was reused at three times, the yield of fruiting bodies was equal to that of fresh medium. However, the yield of the 1st-waste substrate was the best of all waste substrate media and the yields of waste substrate media deceased with recycling times. The yield of the 1st or the 2nd waste substrate medium increased by 1.3-1.4 times compared with that of the fresh medium. The content of low molecular α-glucan and β-glucan of the 1st or the 2nd waste substrate medium increased and C-N ratio of the 1st or the 2nd waste substrate medium decreased. These results suggest that low molecular glucan and N sources contribute to increasing fruiting bodies. It was clear that the 1st and the 2nd waste substrate were useful for the cultivation material of Heicium erinaceum.