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FDS code를 이용한 교량하부창고 화재발생원 영향분석
지광습,이승정,신연호,심재원,김지환,Zi, Goang-Seup,Lee, Seung-Jung,Shin, Yeon-Ho,Shim, Jae-Won,Kim, Ji-Hwan 한국전산구조공학회 2011 한국전산구조공학회논문집 Vol.24 No.6
In this study, we analysed the effect of the fire source in the warehouse under the bridge and the height of the bridge using FDS code. To compare accuracy of simulation results, we simulated the experimental result with unit combustibles which is heptane as well as the mock-up test. Using this method, we evaluated the fire safety of the bridge which contains spalling and strength damage of concrete as well as damage of reinforcements according to the fire source and the height of the bridge. Most of the bridges are vulnerable to spalling of concrete. The book combustion has the strongest fire intensity which is expected to damage the bridge less than 30m height in the three types of the fire sources. The bridge over the 30m height can ensure the fire safety in the case of the rubber combustion. 본 연구에서는 FDS code를 이용하여 교량하부창고 화재발생원과 교량높이의 영향을 분석하였다. 헵탄을 이용한 단위가연물의 연소실험, 실물모형 연소실험 결과와 FDS code를 이용한 해석결과의 비교를 통하여 FDS code의 유효성을 검증하였다. 이를 이용하여 교량하부 표준창고구조물의 실제 화재시나리오를 적용하여 교량높이 및 창고내부 가연물에 따른 콘크리트의 폭렬, 강도손실, 보강철근의 강도손실로 나누어 교량의 화재안전성을 평가하였다. 연구결과, 대부분의 교량이 하부창고화재에 대해 폭렬에 취약한 것을 확인할 수 있었다. 화재강도는 도서류가 가장 강하며 30m 높이 교량에 콘크리트의 강도저하, 폭렬 및 보강철근 강도저하를 가장 크게 발생시킬 것으로 예측되었으며, 고무류 창고화재의 경우 30m 이상 높이의 교량에 대해 화재안전성을 확보할 수 있었다.
열간금형강 SKD 61의 질화특성과 재가열이 질화생성층에 미치는 영향
김정수,신연호 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.6
A hot tool steel, SKD61, nitrided in DC plasma and gas environments was investigated to see the properties of the nitrided layers and the effect of reheating on them. It was observed that as nitriding time increases, the thickness of the nitrided layers (compound and diffusion layers) increases, while surface hardness decreases. X-ray diffraction analyses showed that the compound layers obtainded from the both methods are composed of r'-Fe₄N and ε-Fe_(2-3)N phases which are completely decomposed by reheating at and above 550℃ As reheating temperature went up, surface hardness became low and the hardness difference between surface and bulk matrix became small. At and above 660℃ which was higher than the tempering temperature of the steel, the surface and bulk matrix hardnesses decreased very sharply. It was suggested that to improve the life time of dies, their service temperatures be kept below the tempering temperatures.