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탄소섬유메쉬(CFM)로 보강한 철근콘크리트보의 휨 거동
김성진 ( Kim Sung-jin ),한병찬 ( Han Byung-chan ),최석원 ( Choi Suk-won ),윤현도 ( Yun Hyun-do ),오재혁 ( Oh Jae-huyck ),서수연 ( Seo Soo-yeon ),성수용 ( Sung Soo-yong ),김태용 ( Kim Tae-yong ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
The aim of this study is to provide the basic data for flexural behavior of RC beam strengthened with Carbon Fiber Mesh(CFM). The use of carbon fiber mesh reinforcements in concrete structure is expected to be increased, due to their high tensile strength, superior corrosion resistance, and good bonding performance. This study investigates the flexural performance and modes of failure of simply supported reinforcement concrete beams strengthened with externally bonded with CFM and mortar. A series of 6 specimens was tested to fail in flexure. The variables of experiment are the existence and location of clips, the chipping. The experimental results show that the RC beams strengthened with externally bonded CFM have more the flexure capacity.
피로하중을 받는 탄소섬유메쉬로 휨보강된 철근콘크리트 보의 거동
전수만 ( Jeon Su-man ),성수용 ( Sung Soo-yong ),윤현도 ( Yun Hyun-do ),서수연 ( Seo Soo-yeon ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.2
The aim of this study is to provide the basic data for fatigue behavior of RC beam strengthened with Carbon fiber mesh(CFM). The use of carbon fiber mesh reinforcements in concrete structure is expected to be increased, due to their high tensile strength, superior corrosion resistance, and good bonding performance. This study investigates the flexural performance and modes of failure of simply supported reinforcement concrete beams strengthened with externally bonded with CFM and mortar. The variable of experiment are the existence and location of clips, the chipping. The experimental results show that the RC beams strengthened with externally bonded CFM have more the fatugue capacity.
피로하중을 받는 탄소섬유메쉬로 휨보강된 철근콘크리트 보의 거동
전수만(Jeon Su-Man),성수용(Sung Soo-Yong),윤현도(Yun Hyun-Do),서수연(Seo Soo-Yeon) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.9 No.2
The aim of this study is to provide the basic data for fatigue behavior of RC beam strengthened with Carbon fiber mesh(CFM). The use of carbon fiber mesh reinforcements in concrete structure is expected to be increased, due to their high tensile strength, superior corrosion resistance, and good bonding performance. This study investigates the flexural performance and modes of failure of simply supported reinforcement concrete beams strengthened with externally bonded with CFM and mortar. The variable of experiment are the existence and location of clips, the chipping. The experimental results show that the RC beams strengthened with externally bonded CFM have more the fatugue capacity.
석탄회 인공경량골재를 사용한 고강도 철근콘크리트 보의 휨거동
송병훈 ( Song Byung-hun ),한병찬 ( Han Byung-chan ),성수용 ( Sung Soo-yong ),윤현도 ( Yun Hyun-do ),최창식 ( Choi Chang-sik ),정수영 ( Chung Soo-young ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
This investigation provides experimental data regarding the flexural behavior and ductilities of reinforced high-strength lightweight concrete beams. The objectives of this study are (1)to study the flexural behavior of reinforced high-strength lightweight concrete beams and (2)to examine current ACI recommendations for flexural design in terms of strength and ductility. Test results show that the ratio of flexural strength between experimental results and those by ACI 318-95 is 1.01 in case of lightweight concrete. Also, When concrete compressive strength is 400kgf/cm<sup>2</sup> in reinforced high-strength lightweight concrete beams, the ratio of longitudinal reinforcement to balanced reinforcement needs to be limited to 0.5 in order to obtain 3 in ductility factor.
智異山産 참나무材 AcBr(acetyl bromide) Lignin의 UV 吸光係數에 대하여
成守鏞,文昌國 慶尙大學校 1984 論文集 Vol.23 No.2
智異山産 5樹種의 참나무 材에 對한 AcBr(accetyl bromide) lignin의 UV 吸光係數와 JIS(Japanese Industrial Standard) ligin 含量 및 UV 推定lignin 含量과의 關係를 調査하여 본 바 그 結果를 要約하면 아래와 같다. 1. 各 樹種別 JIS lignin 含量은 졸참나무 材 22.77%, 떡갈나무 材 23.74%, 상수리나무 25.57%, 속소리나무 20.71%, 굴참나무 19.63%였다. 2. UV推定 lignin 含量値는 各各 23.05%, 23.86%, 25.17%, 20.61%, 19.77%였다. 3. JIS lignin 含量値와 UV推定 lignin 含量値間의 相關係數는 平均 0.94(1% 水準)이었다. 4. lignin의 特性을 가장 잘 알 수 있는 280nm에서의 UV吸光度는 졸참나무 0.249, 떡갈나무 0.257, 상수리나무 0.271, 속소리나무 0.223, 굴참나무 0.213이었다. 5. 280nm에서의 UV吸光係數를 計算하여 보면 졸참나무 21.82, 떡갈나무 21.71, 상수리나무 21.16, 속소리나무 21.49, 굴참나무 21.75였으며 平均 吸光係數는 21.59였다. These experiments were carried out to determine the ultraviolet absorptivities of AcBr(acetyl bromide) lignin, JIS(Japanese Industrial Standard) lignin contents, the calculated lignin by Beer-Lambert's law and correlation between JIS lignin content and the calculated from Oaks grown in Mt. Jiri. 1. JIS lignin contents were 22.77% from Q.serrata, 23.73% from Q. dentata, 25.57% from Q, acutissima, 20.71% from Q. donarium and 19.63% from Q.variabilies. 2. The calculated lignin contents by Beer-Lambert's law were 23.05%, 23.86%, 25.17%, 20.61%, 19.77% respectively. 3. The correlation coefficient between JIS lignin xontent and the calculated was 0.94(1% level). 4. The UV absorbances of AcBr lignin at 280nm were 0.249 in Q. serrata, 0.257 in Q. dertata, 0.271 in Q. acutissima, 0.223 in Q. donatium and 0.213 in Q. variablities. The average value was 0.242. 5. The UV absorptivities of AcBr lignin were 21.82 in Q. serrata, 21.71 in Q. dentata, 21.16 in Q. acutissima, 21.49 in Q. donatium and 21.75 in Q. variabilities. The average value was 21.59.
강관 보강된 전단벽 경계부재의 전단성능에 관한 실험연구
성수용,윤현도,정수영,장민수 忠南大學校 産業技術硏究所 1999 산업기술연구논문집 Vol.14 No.1
The purpose of this study is to investigate the begavior of concrete filled square stee ltubular boundary elements subjected to cyclic shearing force and constant axial force. Six boundary elements, with a/D=1.0,were tested to determine their maximum shear force and compare primary curve, energy absorption capacity and stiffness degradation. As a result, in the both high and normal strength concrete boundary elements, the larger the wall breadth to wall thickness ratio(D/t) of the steel tube,the more prominent the decrease in structural performance due to cyclic loading. In the boundary element with D/t=25, the crushing of tube concrete were accompanied by considerable lateral displacement,while in the boundary element with D/t more than 39, the lacal bucking of steel tube and the crushing concrete were accompanied by considerable axial shortening.