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설계기준의 시스템 비계와 동바리 수직재 허용압축응력 제안식 분석
고상섬,원정훈 한국안전학회 2021 한국안전학회지 Vol.36 No.6
This study analyzes the validity of the design allowable compressive stress suggested in the design standards of the new material vertical members in system scaffolds and system supports through experiments. The experimental results were compared with the design allowable compressive stress presented in the design standards for steel structure members (KDS 14 30 10), steel bridge design standards (KDS 24 14 30), and road bridge design standards. As a result of comparing the design formula and the experimental results for the vertical members of the system scaffold, experimental results were found to be similar to the design allowable compressive stress calculated from the road bridge design standard. For the vertical members of the system support, the experimental maximum compressive stress considering the safety factor in all specimens was smaller than the allowable compressive stress suggested in the design criteria. The case, in which the difference between the experimental value and the design standard allowable compressive stress is the smallest is the steel bridge design standard. As the slenderness ratio is relatively large, the difference between the experimental value and the design allowable compressive stress was significant. -
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재사용 시스템비계와 시스템동바리 수직재의 허용강도 분석
박진석,고상섬,원정훈,Park, Jin-Suk,Ko, Sang Seom,Won, Jeong-Hun 한국안전학회 2021 한국안전학회지 Vol.36 No.4
The allowable strength based on experiments and the design allowable strength calculated using the design criteria were compared, which suggested a ratio between the allowable strengths for the reused vertical members of the system scaffolding and system support. By investigating a total of 421 certification reports for reused vertical members, the experimental allowable strengths were collected. Using design criteria such as the road bridge design and KDS 14 30 10, the design allowable strengths were calculated for various slenderness ratios. For the system scaffolding, the average ratio between the experimental and design allowable strengths was calculated to be 0.880 by assuming a normal distribution for all specimens. However, by analyzing the strength ratio according to the slenderness ratio, the lowest average strength ratio was found to be at least 0.844. Therefore, it is reasonable to assume that the allowable strength of the reused vertical members was 80-84% of the design allowable strength. In addition, assuming the allowable strength to be 85% of the design allowable strength is a possible method for reused vertical members of system supports.
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송영호(Song, Young-Ho),고상섬(Ko, Sang-Seom),하동명(Ha, Dong-Myeong),정국삼(Chung, Kook-Sam) 한국화재소방학회 2009 한국화재소방학회 학술대회 논문집 Vol.2009 No.춘계
식용유 화재는 일반유류와는 달리 연소형태나 소화작업에 있어 큰 차이를 보이고 있다. 최근 5년간 특수화재 가운데 원인별 화재 통계를 보면 식용유 화재의 발생빈도는 점점 증가하고 있지만, 식용유에 대한 화재 위험성에 관한 연구는 거의 전무한 실정이다. 본 연구에서는 식용유의 연소특성 알아보기 위하여 종류별 인화점, 연소점, 발연점에 대하여 클리블랜드 인화점 시험기를 사용하여 측정하였고, 최소자연발화온도 및 발화 비발화 영역 비교를 통한 발화한계 온도 곡선을 도출하였으며, 자연발화온도와 발화지연시간과의 관계를 측정하였다. 이 결과를 통하여 식용유의 화재 위험성 평가에 대한 기초적인 자료로써 제시할 수 있었다.
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