http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
서수연 ( Su Youn Seo ),이승훈 ( Seung Hun Lee ),김동열 ( Dong Yeol Kim ) 한국치위생학회(구 한국치위생교육학회) 2012 한국치위생학회지 Vol.12 No.6
Objectives: The purpose of this study is to research and to analyze the relationship between oral health state of infants and oral health awareness of their parents. Methods: The study has been conducted for 196 infants ranging from the age 18 to 60 month and their parents who have visited three dental clinics in Gyeongju city. The questionnaire has been made to identify the parents` oral health knowledge and behavior, while the dentist has examined the dental care, toothbrushing, and malocclusion of infants. Results: According to the results, it has been found out that there is correlation between subject`s health status and oral health status where the higher point of subject`s health status lead to the point of oral health status accordingly. Also it has been additionally recognized that there is the relationship between the awareness of parents and the oral health status of their infants in the same way. Conclusions: The parents who have low oral health awareness are required by oral health professionals to be provided with information on infant oral health, in order to promote and to maintain healthy oral status of their infants. And the specific training on method how to care oral health is needed. In addition, the government should take the detailed measures by extending infant`s medical benefits to draw their attention to the issue.
CFS로 휨 보강된 RC부재의 보강겹수에 따른 구조성능 변화
서수연(Seo Soo-Yeon),김경태(Kim Kyong-Tae),윤승조(Yoon Seung-Joe),윤현도(Yun Hyun-Do),최기봉(Choi Gi-Bong) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.2
Strengthening method using carbon fiber sheets have been developed for the rehabilitation of structures and applied to the concrete member. However, it is still questionable whether their structural capacity has been well kept without any deterioration as time goes. According to a few inspection results about RC buildings with retrofitted members by CFS, there have been found loss of strengthening using CFS because of the detachment of CFS from the concrete face, which causes the bond failure of CFS. The appearance of this loss may be initiated at just after retrofit construction. And it will be more serious when the layer number of CFS increases. In order to minimize above mistake in retrofit design using CFS, more exact evaluation process to predict the bond loss of CFS is required. The final objective of this research is to propose the guideline and method for estimating resistance capacity of strengthened structure as time goes by. In this paper, as a first step, previous equations to predict flexural strength of member retrofitted by CFS are analyzed and evaluated through a test work. And a nonlinear sectional analysis is performed using a commercial analysis program. In experimental work, specimens with the amounts of carbon fiber and strengthening method as test parameter are tested and their behavior is discussed. From the test, the flexural capacity was not linearly increased even if the layer number of CFS increased when it was more than two. The overall nonlinear behavior of RC member retrofitted with CFS could be suitably predicted by the analytical process in this paper by considering the bond loss.