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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.
문미진(Mun Mi-Jin),이유미(Yi Yu-Mi),이광수(Lee Gwang-Soo),안종문(Ahn Jong-Mun),신성우(Shin Sung-Woo) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
Using high strength concrete increase to build high-rise reinforced concrete building for this construction, However, there is no adequate methods for it, whereas it is very important to design compressive strength of concrete according to floors. So that, this paper reports on design method of floor and compressive strength on floors, mix proportion in a lump. For this study, internal and external tall buildings completed 35 through 80 stories are analyzed and compared in terms of design of those. On the basis of the analysis, brief classification of compressive strength to floors, mix proportion plans are suggested. These are suitable for basic design of high-rise reinforced concrete building by high strength concrete.
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.