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출입문용 자동개폐장치를 설치한 실내체육관의 피난안전성 분석
안재천,공하성 대한안전경영과학회 2020 대한안전경영과학회지 Vol.22 No.3
This study analyzed the evacuation time in indoor stadiums when exits that automatically open/close when the fire sensor is triggered are installed as a means to improve the problem of closing certain exits. Firstly, when spectators on the 2nd floor stands exit through the 1st floor exits, the RSET of all inhabitants was 529.8 seconds when the automatic opening/closing exits are broken and employees are not present. Secondly, when spectators on the 2nd floor stands exit through the 1st floor exits, the RSET of all inhabitants was 445 seconds when the automatic opening/closing exits with 750mm width are working but employees are not present. Lastly, when spectators on the 2nd floor stands exit through the 1st floor exits, the RSET of all spectators was 337 seconds when the automatic opening/closing exits with 1,500mm width are working and employees are present. As a result, it was revealed that the evacuation time is shortened when the automatic opening/closing exits are working. Additional comparative studies with actual simulations of people evacuating an indoor stadium and firefighting simulations considering smoke flow are necessary.
Nb 첨가 페라이트계 스테인리스강의 고온강도에 미치는 시효처리의 영향
안재천,이경섭 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.4
Effects of aging treatment at 700℃ on high temperature strength of Nb containing ferritic stainless steels were compared with those of Nb free steels. Hot tensile tests were carried out at 700℃ after the aging for different aging times using Gleeble 1500. The high temperature strength of Nb free steels decreased with increasing aging time mainly due to grain growth. However, the reduction of the high temperature strength in Nb (0.38 wt%) containing steels occurred by Nb precipitation. It was observed that Fe₂Nb(Laves phase), NbC, NbN and Fe₃Nb₃C were precipitated out in 0.01C-0.38Nb steel, while only NbC, NbN was formed in 0.03C-0.38Nb steel during the aging at 700℃. This was well agreed with the calculated equilibrium fraction of precipitates. The coarsening rate of Fe₂Nb was measured faster than that of NbC. Coarse Fe₂Nb particles formed during the aging were very detrimental to high temperature strength. However, fine Fe₂Nb precipitates formed during the tensile test contributed to high temperature strength in 0.01C-0.38Nb steel.