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김이성,윤요현,김화중 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
The purpose performance degradation of concrete structures is generally caused by deteriorations, such as surface collapse, pop-out, crack, and so on. It may result in serious defects of the concrete structures. Thus it is very important 세 detect and repair the defects of concrete structures within a proper time to assure the structural safety. However, the defects due to the deteriorations are usually difficult to find by visual inspection. A sensor is developed in this study, which may give early indication for degradation of concrete structures and show the location of the damage. Cracks can be defected by the liquid in a small glass capsules which are embedded in the concrete structures. This paper discusses the applicability of that was developed smart concrete.
고온에서의 steel-frame의 열응력 해석에 관한 연구
조경래,윤요현,김화중 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
We are the actual circumstances which a steel building is expanding to the trend of the larger and the higher stories of a city building. but, A fire resistance of Steel is fallen at high temperature compared with RC structure building therefore it brings strength degradation and occurrence of the thermal stress eventually steel have fatal fault at proof against the fire performance. for example, we saw collapse of the WTC building by fire in New York. A method of analysis for the structural behavior of steel member including thermal and mechanical properties of steel member under elevated temperature, is formulated. This paper presents the result of investigation on the time-dependent behavior in steel frame and structure, under loads and elevated temperature. In this research I have developed a program to analyze the complex non-linear motivation of thermal stress under high temperature with stational theory. With the program which I had developed I have analyzed sorts of steel-structure elements and frames, and the conclusion listed then.
가네트를 활용한 고강도콘크리트의 고온수열 후 잔존압축강도특성
김동익,윤요현,박정민,김화중 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
The study which it describes the high concrete which industrial by-product used garnet powder was quality of residual strength after heating. The test unit water content 160kg/m', water reunion ratio did with 30%, 35% and the aggregate ratio is 40%, 42%, 44%, displacement ratio admixture is 0%, 10%, 20%. Admixture garnet powder, fly ash, blast-furnace slag and it was compared with the residual strength of concrete after was heated to normal temperature, 50℃,100℃, 150℃, 200℃, 350℃, 500℃, 600℃, 800℃.With this test was got the next conclusion. To previously 350℃, the weight reduction was not big, it was visible the weight reduction which was sudden from 350℃, and it showed the aspect which also the compressive strength reduction is identical. It compared with admixture nothing replacement concrete, garnet replacement concrete relatively weight reduction and compressive reduction appeared small. Like this tendency recording where the replacement ratio will be increased the tendency which appeared relative small.
가네트를 활용한 고강도 콘크리트의 황산염저항성 특성 연구
윤종문,윤요현,박정민,김화중 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
The purpose of this study is about to characteristic of sulfate resist performance following precipitation age of high strength concrete using the garnet minute power. Experiment was compared to the weight change and compressive strength to follow that unit water content 160kg/m³, W/B 30%, 35% and fine aggregate ratio(S/A) 40%, 42%, 44%, admixture(garnet minute power. fly ash) 0%, 10%, 20% and precipitation age. We got the conclusion of the downside through the experiment. Garnet concrete was appeared that was superior to sulfate resist performance by the increasing of garnet. Case of the W/B 30%. garnet concrete did not get up the diminution of weight to follow that small mixing ratio of S/A and expressed diminution of weight the increasing in ratio of S/A. Consequently. If we should make concrete as condition of optimum mixture. we will be expected the effect of sulfate resist performance.
김동익(Kim Dong-Ik),이영생(Lee Young-Seng),윤요현(Yoon Yo-Hyun),김화중(Kim Wha-Jung) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Great losses of property and individual has been brought to the damage In fire because of higher stones of structure, therefore structures need to design building safety, In particular, fire resistance design of structures is necessary. Prescriptive-based method which is used In korea is easy design and Simple method, but It 1$ not economic and reasonable method because It is applied uniform fire resistance standard which disregarded the quality of the building. Thus, It 18 necessary to introduction of performance-based method which IS used the advanced foreign For introduction to korea, we must establish fundamental D/B and develop fire proof verification method of structure Therefore, we study for verification method development from fire resistance of steel structure that real fire behavior is estimated
보수기능을 갖는 경량골재와 그를 이용한 스마트 콘크리트 개발
윤종문(Yoon Jong-Moon),김이성(Kim Ie-Sung),윤요현(Yoon Yo-Hyun),김화중(Kim Wha-Jung) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Material of concrete has a high compressive strength and its maintenance, management is comparatively easy. It is the main material which makes a infra-structure and a construction structure. Various technology was developed by the end of today, and the capacity of strength and construction nature of concrete improved. Performance degradation of concrete structures is generally caused by the deteriorations, such as surface collapse, pop-out, crack, and so on. It is generated according to a complex factor and the deterioraion generated by the structure of concrete is also complex. There must be it will be able to estimation the fracture form of the infra-structure visually. We encapsulate the core materials which have long term resisting properties in a member of concrete in this study. Glass pipes and lightweight aggregates show development of strength as the damage part beforehand with structure of concrete. Invention of the Intelligent concrete which tells repair time is the purpose.