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화재손상된 철근콘크리트 깊은 보의 전단경간비에 따른 구조성능 변화
서수연(Seo Soo-Yeon),윤승조(Yoon Seung-Jo),김영만(Kim Yeong-Man),최기봉(Choi Ki-Bong) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.11
This paper presents experimental result of reinforced concrete deep beams with various shear span-to-depth ratios damaged by fire. Main parameters in the test were fire exposure duration and shear span-to-depth ratio. Nine RC deep beam specimens were made and six of those were exposed to fire by following standard fire loading curve. And then beam test was performed for those under simple support condition. Strength variation of materials by the exposure time and temperature of fire was evaluated through material test for concrete and reinforcements damaged by fire. In order to predict the specimen's structural capacity, analysis was performed using nonlinear sectional analysis and truss analogy. From the research, it was found that the strength of RC deep beam damaged by fire was more seriously affected by level of temperature than exposure time during fire loading. However, concrete tended to be dry as the exposure time increased so that the overall behavior of member changed to brittle failure mode. In order to suitably predict the strength of deep beam damaged by fire, the change of properties of concrete and reinforcements at each location should be well defined and appropriately reflected in analysis model.
화재에 의한 콘크리트 충전 각형강관기둥의 온도분포에 대한 유한요소 해석
서수연 ( Seo Soo-youn ),박성희 ( Park Sung-hee ),안광현 ( Ahn Kwang-hyun ),윤승조 ( Yoon Seung-jo ),최기봉 ( Choi Ki-bong ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
In this research, fire resisting capacity of concrete filled slender rectangular steel tube (CFT) column was evaluated according to the finite element analysis. This finite element analysis of CFT column was conducted using Adina program, version 8.5.2. As major variables, the strength of concrete, heating time, and heating plane were established. At the first place, by performing heat transfer analysis of the member having considered thermal characteristics of materials, the temperature distribution within the cross section was predicted, and having closely reviewed temperature distribution data and considered mechanical properties, the researcher examined the behavior of CFT column and its temperature distribution at the time the fire breaks out. The results from analysis indicated that, in case of one to two planes each according to the heating plane, the increase rate of minimum temperature within the cross section through the central part was about 43% when heating it for 60 minutes, and about 23% when heating it for 120 minutes, and about 23% when heating it for 180 minutes, and that, in case of two to four planes, the increase rate of minimum temperature was about 17% when heating it for 60 minutes, and 14%, for 120 minutes, and 8%, for 180 minutes.
尹勝照 충주대학교 1993 한국교통대학교 논문집 Vol.27 No.-
In case of building design according to the construction law for large concrete panel structure, the reciprocal joint design by panel is an important factor to support for standing of whole construction. However, we don't have proper theory systematically yet on the joint behavior in this joint design because of many corelative factors. Therefore, this was arranged the basic theory of joint in compliance with existing studies on vertical & horizontal joint for large concrete panel structures.
콘크리트 構造物의 龜裂에 따른 發生原因과 補修方法에 관한 硏究
尹勝照 忠州大學校 1993 한국교통대학교 논문집 Vol.28 No.-
This is directed for the cause and prevention of crack in concrete structures. The type of crack ocurring in concrete building is divided into the microcracking shape and external type. These kinds of crack are due to a lot of factors, but its major factors are classified as following : the factors of environment, structuring design, material, execution of construction and so on. Though it is impossible to prevent perfect crack in concrete building, we could reduce the crack as far as possible with the following method. 1. To construct the expansion joints in proper position. 2. To improve the factors of environment. 3. To rationalize the construction and design method. 4. To improve the factors of material. 5. Perfect execution of construction
螺旋補强筋이 鐵筋 콘크리트 기둥에 미치는 영향에 관한 實驗的 硏究
尹勝照 충주대학교 1990 한국교통대학교 논문집 Vol.24 No.-
This study is about the affect to the confinement of spirally lateral in the reinforced concrete columns subjected to the uniaxial compressive loading and an attempt to provide a basis for the method to analyze the ultimate strength. The primary concern of this study is to propose the ultimate strength formula for the spirally lateral reinforced concrele based on the results of this test. The approach of this study was to test total 108 specimens which were composed of variables including the concrete strength, the specimen size and the spiral pitch, then to analyze and compare the result with another.
EVA에멀죤 使用量 變化에 따른 시멘트 몰탈의 防水特性分析에 關한 實驗的 硏究
尹勝照 忠州大學校 1991 한국교통대학교 논문집 Vol.25 No.-
Using some kinds of standard sand, fine aggregate formed by natural sand and variety of EVA amount, all situation analysing results on waterproof property of cement mortar are as belows; 1) Flow value was maximum with the EVA amount 5-10% and strikingly fell-off with 40%. 2) For the strength comparison of each aggregate, natural sand is higher than standard sand with 0-40% ; as a compression testing case shown above, results in the all section and another on tension and bending strength have come out the same at the lower EVA amount used. 3) Waterproofing/absorption value is minimum with natural sand 20% and maximum with natural sand 40%.
다용도 횡보강근으로 보강된 RC 기둥의 축하중 거동에 관한 실험적 연구
윤승조 한국교통대학교 2015 한국교통대학교 논문집 Vol.50 No.-
The purpose of this study is to evaluate structural capability. Specifically, the existing construction methods' inadequate achievements in construct ability and reinforcement performance are improved and an experiment on axial load is performed with a reinforced concrete column test specimen constrained by Multi-Transverse. According to the result of the experiment, in maximum strength comparison higher stresses meant higher maximum strengths. A total of 6 test specimens that can cope with axial load were made. After that, failure mode depending on stress, maximum load change, and strain and ductility ratio of steel bands were checked.
中心軸力을 받는 高强度 鐵筋 콘크리트기둥의 擧動에 관한 實驗硏究
尹勝照,崔生吉 충주대 산업과학기술연구소 1993 産業科學論文集 Vol.1 No.-
This paper is to study on the behavior of high-strength concrete columns under uniaxial loads and offer the basis on the effect of rectilinear reinforced in high-strength concrete by compared with the existing model for stress-strain curve of rectilinearly confined concrete. From the experimental study, the following conclusion were obtained. 1) Concrete, When confined with rectangular ties and longitudinal steel, showed a considerable strength gain as well as incresed ductility. In the case of specimens confined with transverse and longitudinal reinforcement, the increse in ductility was up to 30%, strength increment was up to 213%. Therefore, it is desirable to convine the concrete with transverse and longitudinal reinforcement, for the increase ductility and strength. 2) In comparing of difference of ratio of longitudinal steel to the area of cross section if ratio is increased by 78.9%, it is showed that strength of HCAB is increased by 21.4% than that of HCAA1 and that of HCBB is increased by 32% than that of HCBAI. Namely, increment of ratio of area of longitudinal kneel increase bending area with cover concrete as much as ratio of area of longitudinal steel, delay seperation of cover concrete and also increase effective confinement area of concrete, so that strenth of specimens was thought to be increased. Consequently, ratio of area longitudinal steel is consider as a variable which influence the behavior of reinforced concrete columns.