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고강도 콘크리트(80MPa이상)를 이용한 콘크리트충전강관구조 적용을 위한 기초물성 연구
이장환,강용학,정근호,김진호,정상진,최문식 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
One of the most important reasons that CFT is used in many conditions is by using that we can achieve the effect, which reduce the section of the member. This research purpose to find the most ideal composition, which is achieved by the investigation in the concrete's property of matter like ability of Slump, Slump Flow, Air content, Bleeding, and Settlement when the high strength of concrete which is over 80MPa is used m the CFT column.
이장환,한용운,Lee, Jang-Hwan,Han,Yong-Un 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.4
The change of the structure of homogeneous turbulence subject to irrotational strains has been studied in an anti-Morel type diffuser (center matched cubic contour) using the hot wire anemometry. It was observed that the profiles of mean velocities and turbulence velocities along the center line were stable at the entrance region but rapidly changed near the matching point. The wall induced turbulence at the entrance region grows fast and was diffused toward the center at downstream. It was also observed that the axial turbulence grows faster than the radial one in the middle region of the diffusing flow and that the diffusing process has the vortex compression mechanism due to the conservation of angular momentum. These phenomena are frequently observed at the initial flow region of the free jet.
확대관의 단면변화율 차이에 따른 유동특성변화에 관한 연구
李璋煥 영남이공대학 1993 論文集 Vol.22 No.-
A wind tunnel experiment was carried in order to investigate the difference of flow characteristics between two diffusers of different sectional area increase rate grows larger, the axial mean velocty pro-file has the tendency to accumulate about the center line, and turbulent velocity expansion ratio grows bigger. And was observed that the flow can't follow the section expantion, the rapid diffuser flow characteristics assembles the free jet flow. The TKE balance evolution along the center line were investigated.