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축력비와 횡보강근 형상을 고려한 초고강도 RC 띠철근 기둥의 연성능력평가
김종근(Kim Jong-Kuen),한범석(Han Byum-Seok),신성우(Shin Sung-Woo) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.1
An experimental investigation was conducted to examine the hysteretic behaviors of ultra-high strength concrete tied columns. The purpose of this study is to investigate the safety of ultra-high strength concrete columns with 100 ㎫ compressive strength for the requirement of ACI provisions. Eight 1/3 scaled columns were fabricated to simulate an 1/2 story of actual structural members with the cross section 300×300 ㎜ and the aspect ratio 4. The main variables are axial load ratio, the configurations and volumetric ratios of transverse reinforcement. The results show that the ductility of columns are affected by the configurations and volumetric ratios of transverse reinforcement. Especially, it has been found that the behavior of columns are affected by axial load ratio rather than the amounts and configurations of transverse reinforcement. Therefore, when the level of axial load is about 50 percent of column axial load capacity and concrete compressive strength is approximately 100 ㎫ in same condition, the amount of transverse reinforcement is required over 30 percent larger than specified in the seismic provisions of ACI 318-05 code for ductile behavior. Consequently, to secure the ductile behavior of 100 ㎫ ultra-high strength concrete columns, ACI provisions for the requirement of transverse reinforcement may considered axial load level and the details of transverse reinforcement.
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김종근(Kim Jong-Kuen),백정훈(Baek Cheong-Hoon),홍인표(Hong In-Pyo),신성우(Shin Sung-Woo) 대한건축학회 2010 대한건축학회논문집 Vol.26 No.8
Recently, wind energy is emerging as next generation new growth power with the highest economic efficiency among new & renewable energies. This study intends to model actual building by devising composite building established on the tower of long span bridge on the sea, and evaluate the efficiency of wind energy source through various kinetic simulations. This study adopted VAWT method that offers high applicability to building though its energy efficiency is low. Experiment was done by using ① membrane, ② fluid turbine and kit, ③ actuated tensegrity to solve the problems VAWT method involves, and the experiment results are as follows: 1) The case with membrane installed showed 25.5% elevation of rotation compared with the case with no installation of membrane. 2) Turbine rotating body with fluid in it showed higher rotation amount compared with solid turbine rotating body. 3) Actuated tensegrity promotes unrestricted modification, and thus offset vortex vibration. Thus, this study proposed the design of wind power composite building using tower after applying the above technique as design elements.
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철근콘크리트 기둥에서 띠철근으로 구속된 고강도콘크리트의 구속효과 평가
한범석(Han Byum-Seok),김종근(Kim Jong-Kuen),신성우(Shin Sung-Woo) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.3
An experimental study was conducted to investigate the confined effects by transverse reinforcements in reinforced high strength concrete tied columns subjected to monotonically increasing concentric axial compression. Fifteen large scale columns (260 ㎜ × 260 ㎜ × 1200 ㎜) used high strength concrete of 85 MPa were fabricated to simulate similarly an actual structural members size. Effects of main variables such as the volumetric ratios, spacing, configurations, and yield strength of transverse reinforcement were studied in this research program. Especially, various types of transverse reinforcement were considered in this experimental study. Test results indicated that gains of strength and ductility of confined high-strength concrete in tied columns could be increased, if efficient arrangements, configurations and volumetric ratios of transverse reinforcements were provided. And an improvement of strength and ductility for the confined high strength concrete is proportional to the effective lateral pressure of transverse reinforcement.
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