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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.
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.
연속 CIP 공법으로 형성된 PUS 부재의 단면 설계 및 휨 강도 산정
김승훈,노삼영,홍성진,김갑수,한범석,Kim, Seung-Hun,Noh, Sam-Young,Hong, Seong-Jin,Kim, Kap-Soo,Han, Byum-Seok 대한건축학회 2012 대한건축학회논문집 Vol.28 No.6
Recently the Permanent Uni-wall System (PUS) has been developed which improved the disadvantage of the CIP and could be used as permanent retaining wall. The sections of PUS members are molded with circle casing form and deformed casing form. In the generality of cases, deformed casing section consists of reinforced concrete because of the concrete cover by code and the method of concreting with tremie pipe. But, circle casing section can be designed with various structural types which are steel, reinforced concrete, and steel reinforced concrete(SRC). In this study, design methods for PUS section were proposed and two types of PUS section were tested to investigate the flexural strength and behaviors. Variable was the details of circle casing section which were the deformed bars and the shear reinforcements surrounded H beam. All specimens failed due to concrete crushing. Specimen with SRC section in circle casing showed more ductile behavior after ultimate flexural strength than the other specimen. Nominal flexural strengths by section analysis and design code based on a strain-compatibility approach were compared with test results. These comparisons showed that PUS section possessed the flexural strength by design code.
FRP Bar를 주근으로 사용한 일방향 콘크리트 슬래브의 전단강도 평가
서대원(Seo Dae-Won),한범석(Han Byum-Seok),신성우(Shin Sung-Woo) 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.10
Fiber reinforced polymer(FRP) bars are currently available as a alternative for conventional steel bars in concrete structures exposed to deiceing salts and marine environments. Compared to steel, FRP bars have high tensile strength, low modulus of elasticity and elastic-brittle stress-strain behavior. Due to the low modulus of elasticity of FRP bars, concrete members reinforced longitudinally with FRP bars experience reduced shear strength compared to the shear strength of those reinforced with the steel reinforcement. This paper evaluates the shear strength of one-way concrete slabs reinforced with fiber reinforced polymer(FRP) bars. Nine slabs were constructed and tested. The slabs were 4,000 ㎜ long × 1,200 ㎜ wide × 200 ㎜ deep. The test parameters were the type of FRP reinforcing bars and the reinforcement ratio. The slabs were tested under four-point bending over simply supported clear span of 3,000 ㎜ and a shear span of 1,000 ㎜. The experimental shear strengths were compared with the JSCE recommendations, the CAN/CSA code, and the ACI 440.1R.03 design guide lines. The results indicated that the ACI 440.1R-03 design method for prediction the concrete shear strength of FRP slabs is very conservative.
GFRP 보강근을 사용한 콘크리트 휨부재의 균열 및 처짐평가
김재생(Kim Chae Saeng),서대원(Seo Dae Won),한범석(Han Byum Seok),안종문(Ahn Jong Mun),신성우(Shin Sung Woo),박영환(Park Young Hwan) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1
The use of FRP bars to reinforce concrete structures is considered as one of the most prominent solution that may overcome the corrosion of reinforcing steel bars. However, the low modulus of elasticity of the FRP materials and their non-yielding characteristics results in large deflection and wide cracks in FRP reinforced concrete members. Consequently, in many case, serviceability requirements may govern the design criteria of such members. This study is focused on verifying equations of ACI 440.1R-01 and ISIS Canada design manual to predict deflections and crack widths. It is also focused on providing engineers and researchers a better understanding of the behavior of GRRP reinforced concrete beams.