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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.
탄소나노튜브를 혼입한 시멘트 복합체의 압축 및 전기적 특성
장아연 ( Jang Ah-yeon ),윤다애 ( Youn Da-ae ),임성훈 ( Lim Seong-hoon ),서수연 ( Seo Soo-yeon ),윤현도 ( Yun Hyun-do ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1
This research uses carbon nanotubes (CNTs) that are actively used to develop convenient and systematic management of building blocks and structural performance monitoring, away from the difficulties of structural health monitoring such as RC structures. The change in electrical resistance was evaluated according to the amount of load and compressive load. Experiments were carried out with 1.0% and 2.0% CNT, and 30% and 60% compressive strength, respectively. Experimental results show that the compressive strength of CNT 2.0% is lower than the compressive strength of CNT 1.0% but is more sensitive to changes in electrical resistance due to compressive load.