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Matsumoto, Shuichi,Hosozawa, Osamu,Narihara, Hiroyuki,Komuro, Tsutomu,Kawamoto, Shin-ichiro Council on Tall Building and Urban Habitat Korea 2014 International journal of high-rise buildings Vol.3 No.1
In recent years, the performance requested for which an ultra-high rise buildings is diversified. Large spans are designed in order to gain wide workspace. Column positions are shifted in middle stories to provide space different from neighboring floors. Moreover, in the bottom layers of the building, it is becoming more important to expand freedom to plan flexibility such as creating publically opened wide atria that gives attractive free space. Earthquake-proof criteria is also changing not only human life protection deign but also a design that allows functional continuity. In order to achieve thee needs, as one of technology, we have developed ultra-high strength concrete filled tubular (CFT) columns of the box section that combine ultra-high strength concrete with specified strength of $150N/mm^2$ and ultra-high strength steel material with tensile strength of $780N/mm^2$. In this paper, the outline of development of an ultra-high strength CFT column is reported. Also, the structural design of the ultra-high-rise building using the CFT columns is reported.
Plastic Deformation Capacity of Steel Beam-to-Column Connection under Long-duration Earthquake
Yamada, Satoshi,Jiao, Yu,Narihara, Hiroyuki,Yasuda, Satoshi,Hasegawa, Takashi Council on Tall Building and Urban Habitat Korea 2014 International journal of high-rise buildings Vol.3 No.3
Ductile fracture is one of the most common failure modes of steel beam-to-column connections in moment resisting frames. Most proposed evaluation methods of the plastic deformation capacity of a beam until ductile fracture are based on steel beam tests, where the material's yield strength/ratio, the beam's moment gradient, and loading history are the most important parameters. It is impossible and unpractical to cover all these parameters in real tests. Therefore, a new attempt to evaluate a beam's plastic deformation capacity through analysis is introduced in this paper. Another important issue is about the loading histories. Recent years, the effect on the structural component under long-duration ground motion has drawn great attentions. Steel beams tends to experience a large number of loading cycles with small amplitudes during long-duration earthquakes. However, current research often focuses on the beam's behavior under standard incremental loading protocols recommended by respective countries. In this paper, the plastic deformation capacity of steel beams subjected to long duration ground motions was evaluated through analytical methodology.
Edge profile measurements using Thomson scattering on the KSTAR tokamak.
Lee, J H,Oh, S,Lee, W R,Ko, W H,Kim, K P,Lee, K D,Jeon, Y M,Yoon, S W,Cho, K W,Narihara, K,Yamada, I,Yasuhara, R,Hatae, T,Yatsuka, E,Ono, T,Hong, J H American Institute of Physics 2014 Review of scientific instruments Vol.85 No.11
<P>In the KSTAR Tokamak, a 'Tangential Thomson Scattering' (TTS) diagnostic system has been designed and installed to measure electron density and temperature profiles. In the edge system, TTS has 12 optical fiber bundles to measure the edge profiles with 10-15 mm spatial resolution. These 12 optical fibers and their spatial resolution are not enough to measure the pedestal width with a high accuracy but allow observations of L-H transition or H-L transitions at the edge. For these measurements, the prototype ITER edge Thomson Nd:YAG laser system manufactured by JAEA in Japan is installed. In this paper, the KSTAR TTS system is briefly described and some TTS edge profiles are presented and compared against the KSTAR Charge Exchange Spectroscopy and other diagnostics. The future upgrade plan of the system is also discussed in this paper.</P>