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고온가열에 의한 CFT Stub Column의 역학적 특성평가
김규용(Kim Gyu-Yong),이태규(Lee Tae-Gyu),김영선(Kim Young-Sun),민충식(Min Choong-Siek),강연우(Kang Yeoun-Woo) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.7
Recently, it increases in use of CFT(Concrete filled steel tube, below CFT) because it an excellent internal force and deformation capacity. But, CFT column lose bearing capacity when steel tube is exposed under fire. In case of the Europe, Japan and America, it have been studied the fire-resistance performance of CFT to use actual specimen. Fire resistance performance of CFT column is determined to internal concrete at fire. Therefore, it is able to evaluate mechanical properties at elevated temperature though specimen reduce the scale. In this study, it is experimentally investigated in effects to use CFT Stub Column at elevated temperature. This study is aimed to study the effect of elevated temperatures ranging from 20 to 700℃ on mechanical properties of concrete according to strength of concrete and fiber mixing. Tests were conducted with □75×75×H200 ㎜ CFT Stub Column and Ø100×200 ㎜ cylinder specimens, which compared to that observed at 20℃. As a result, compressive strength decreased at 100℃, rose again at 200~300℃ and decreased over 300℃. But elastic modulus is decreased continually, and there were deferent as intended compressive strength at elevated temperature. Failure mode shows local buckling at a third of length.
하중조건에 따른 보통 및 애쉬 및 점토계 경량골재 콘크리트의 열팽창변형
김규용(Kim Gyu-Yong),이태규(Lee Tae-Gyu),최경철(Choe Gyeong-Cheol),남정수(Nam Jeong-Soo),강연우(Kang Yeoun-Woo) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.5
In case of concrete, it should be deformed by many factors such as explosive spalling, thermal strain and creep at high temperature. structural fire design have been proposed to predict fire damage as national standard. It is general safer to use values obtained from tests of unstressed residual test in stead of stressed test. But most of thermal properties on concrete was conducted with normal aggregate. In this study, test was conducted to evaluate stressed effect concerning normal weight and light weight concrete of 60㎫. Our experimental procedure was based on RILEM recommendation. Loading level was 0, 20 and 40 percent of compressive strength at room temperature. And thermal strain properties of concrete was carried out by 100, 200, 300, 500 and 700℃. Also, results can be analyzed as compare thermal strain properties at elevated temperature with CEN and CEB code.