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안종문(Ahn Jong-Mun),반병열(Bahn Byong-Youk),신성우(Shin Sung-Woo) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.1
As the social demand is increasing in high-rise building, high-strength concrete(HSC) is issued. HSC has a lot of merits in strength. But, HSC shows brittle failure mode which has to be enhanced in ductility. So, the ductility can be improved by confinement of transverse tie, which is affected by amount, spacing, strength and configuration of lateral reinforcement and compressive strength of concrete. More experimental results in wide range of test parameters for HSC columns have to be accumulated to evaluate performance of HSC columns. Furthermore, the HSC column is overestimated as a current design code is almost based on the test results of normal strength concrete(NSC). Thus, code provisions for both design of HSC columns and confinement effect of HSC columns are demanded.<br/> An experimental study was conducted to investigate the behavior of reinforced concrete columns confined with various configuration of reinforcement. A total of 30 specimens were tested under monotonically increasing concentric compression. The test parameters included were the volumetric ratio of transverse reinforcement(ph = 0.49~2.65), tie configuration(S-type, SO-type, SR-type) and concrete compressive strength (23.4, 43.7, 70.3MPa). Test results indicate that behavior of reinforced concrete columns is influenced on the tie configuration and concrete compressive strength with almost equal volumetric ratio of transverse reinforcement and approximately equal tie spacing, and on the volumetric ratio of transverse reinforcement.
안종문(Ahn Jong-Mun),신성우(Shin Sung-Woo),김진호(Kim Jin-Ho) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.6
The purpose of this study is the development and application of the high strength-self compaction concrete(SCC) which<br/> can be filled from the bottom in the 22m rectangular steel tube column. This self compacting concrete, while having a slump<br/> flow value of about 70cm and a compressive strength of 50MPa, maintains high fluidity without segregation and can be filled<br/> inside steel tubes column without vibrating compaction.<br/> From the experimental study, it was found that there were the suitable viscosity of concrete for improving the pumpability,<br/> segregation resistance and the filling characteristics, which are highly dependent on the chemical admixtures such as<br/> superplasticizer and viscosity agent in addition to general mix proportion. It was also found that the portable pump pressure car<br/> with capacity of 130 bar was satisfied to fill up the high strength-self compaction concrete from the bottom of steel tube<br/> column.
신성우,안종문,이광수,반병렬,염성기,Shin, Sung Woo,Ahn, Jong Mun,Lee, Kwang Soo,Ban, Byung Lyul,Yeom, Sung Ki 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 논문집 Vol.2 No.1
It is demanded to obtain the design data for bond length of the strengthening carbon fiber sheets. An objectives of this study is to provide preliminary data of rational strengthening design method which is adequate to current domestic status. The present experimental study was performed to evaluate flexural strengthening effects of steel reinforced concrete beams strengthened with carbon fiber sheets. Following conclusions can be extracted. It is revealed that the maximum load carrying capacity is increased up to 9% when the reinforced concrete beams were strengthened with 1-ply of carbon fiber sheet which is half-width of beam. The performance of reinforced concrete sections were improved due to the strengthening carbon fiber sheets on the tensile side of beams. It is believed that the strengthening length of carbon fiber sheets must be provided as (0.5l+3d) to secure the ductile capacity of above three for the flexural strengthening of reinforced concrete beams.
신성우,이광수,안종문,최명신,Shin, Sung-Woo,Lee, Kwang-Soo,Ahn, Jong-Mun,Choi, Myung-Shin 한국콘크리트학회 1999 콘크리트학회지 Vol.11 No.1
본 연구에서는 전단보강비율에 따른 고강도경량 철근콘크리트보의 전단거동을 규명하기 위하여 15개의 실험체를 제작하여 실험하였다. 실험변수는 전단스팬비(a/d=2.5, 3.5, 4.5)와 전단보강근비($0{\sim}1.0_{ACI}{\rho}_v$)이고 큰크리트의 압축강도 (439kg/$cm^2$)와 주철근비(0.02023)는 일정하게 하였다. 실험결과, ACI 규준식은 고강도경량 철근콘크리트보에서 큰크리트의 전단내력은 과소평가하는 반면 전단보강근의 전단내격은 과대평가하는 것으로 나타났다. 큰크리트의 전단강도($V_{cr}$)식에서 경량콘크리트에 대한 추가적인 전단강도저감계수 ${\lambda}$=0.85는 경량콘크리트의 고강도화에 따라서 다소 상향조정하여 사용할 필요가 있는 것으로 보인다. 또한, 전단보강근의 전단강도는 보통중량콘크리트보와 같이 전단보강비율에 직선적으로 비례하는 것이 아니라 그 제곱근에 비례하는 경향을 보였으며, 따라서 고강도경량 철근콘크리트보에서 전단보강근의 유효성(전단보강의 효과)은 보통중량콘크리트에 비해 떨어진다고 볼 수 있다. In this study, fifteen reinforced high-strength lightweight concrete(HLC)beams were tested to investigate shear behavior of specimens according to shear reinforcement ratio. Test variables are shear span to effective depth ratio(a/d=2.5, 3.5, 4.5) and shear reinforcement ratio(0~1.0${\rho}_{v,ACI}$). Concrete compressive strength and tensile steel reinforcement ratio are constantly 439kg/$cm^2$ and 0.0203, respectively. Test results for the HLC beams showed that ACI code equation underestimates the shear strength of concrete($V_c$), and overestimates the shear strength of shear reinforcements($V_s$). It is revealed that the effectivenesses of shear reinforcements of reinforced HLC beams are lower than those of normal weight concrete beams. Then, the shear strengths of shear reinforcements are increased in proportion not to first degree of shear reinforcement ration but to square root of them.
하니컴(다각)형 복합체 시스템으로 보강한 RC 조적끼움벽체의 내진성능평가
김종근,서철호,안종문,신성우,Kim, Jong-Keun,Seo, Chul-Ho,Ahn, Jong-Moon,Shin, Sung-Woo 대한건축학회 2011 대한건축학회논문집 Vol.27 No.12
This study conducted an experiment on seismic retrofitting in order to improve seismic performance of RC framed structures of non-earthquake resistant designs. In the experiment, masonry infill walls were strengthened with composite precast concrete(PC) panel systems using honeycomb-type reinforcements. Structural analysis was conducted with actual structures, and a single span which was found to be in need of seismic retrofitting was scaled down by 1/2 ratio and was modeled. The specimens were of 6 different types, including the reference specimen of an RC frame designed to be non-earthquake resistant. The 6 types were divided by whether there was reinforcement on the masonry infill wall and how to retrofit the wall with the honeycomb composite panel system. The experiment results showed that seismic performance of the test specimens increased in all the factors including strength, stiffness, ductility and energy dissipation, so it was considered that retrofitting measures need to be taken to secure proper seismic performance. When seismic performance was evaluated, the target of strength and ductility was set as 30% increase. Since all the specimens were found to meet the target, it was considered proper to retrofit masonry infill walls with PC panels.