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반단면 프리캐스트 패널을 적용한 RC 슬래브의 내화성능 평가
정철헌(Chung Chul-Hun),임초롱(Im Cho-Rong),김현준(Kim Hyun-Jun),주상훈(Joo Sang-Hoon) 대한토목학회 2010 대한토목학회논문집 A Vol.30 No.4A
본 연구에서는 반단면 프리캐스트 패널을 갖는 RC 슬래브에 대해서 비재하 상태에서 ISO-834 화재곡선을 적용한 가열시험을 수행하였다. 가열시험시 PP섬유 혼입되지 않은 실험체에서는 콘크리트의 폭렬이 발생되고, PP섬유가 혼입된 실험체에서는 폭렬이 발생되지 않았다. PP섬유가 혼입된 반단면 프리캐스트 패널을 적용한 RC 슬래브의 발생온도는 PP섬유가 혼입되지 않은 경우보다 낮은 수준을 보였다. 화재 가열실험 후 상온상태로 냉각된 RC 슬래브의 극한하중을 평가하기 위하여 3점 휨실험을 수행하였다. 실험결과, PP섬유가 혼입되지 않은 RC 슬래브는 PP섬유가 혼입된 실험체와 비교해 약 32.5%정도 극한하중이 감소하는 결과를 보였다. 또한, PP섬유가 혼입된 반단면 프리캐스트 패널을 갖는 RC 슬래브의 극한하중은 PP섬유가 혼입된 전두께 RC 슬래브보다 큰 수준을 보였다. 이상의 결과에서 PP섬유의 혼입과 반단면 프리캐스트 패널 적용시 화재에 대한 저항능력이 향상됨을 확인하였다. The fire performance of RC slabs with half-depth precast panel after exposure to the ISO-834 fire standard without loading has been experimentally investigated. During heating, according to the ISO 834 fire curve, concrete spalling was observed for concrete without PP(polypropylene) fibers. No spalling occurred when heating concrete containing PP fibers. The maximum temperature of RC slabs with PP fibers with half-depth precast panel was lower than that of concrete without PP fibers. The ultimate load after cooling of the RC slabs that were not loaded during the furnace tests was evaluated by means of 3 points bending tests. The ultimate load of the RC slabs without PP fibers showed a considerable reduction (around 32.5%) of the ultimate load after cooling if compared with of RC slabs with PP fibers. The ultimate load of the RC slabs with half-depth precast panel with PP fibers is higher than that of a full-depth RC slabs with PP fibers. Also, the addition of PP fibers and the use of half-depth precast panel improve fire resistance.
건설안전분야 : 화재에 의한 지하공동구의 온도 및 응력해석
김현준 ( Hyun Jun Kim ),임초롱 ( Cho Rong Im ),유현경 ( Hyeon Kyeong Yoo ),정철헌 ( Chul Hun Chung ) 한국안전학회(구 한국산업안전학회) 2011 한국안전학회지 Vol.26 No.6
This paper has presented a finite element analysis of structural behaviour of box culvert during and after fires. The fire tests were carried out in afurnace on RC slabs using the ISO 834 standard fire curve. The load capacity after cooling of the RC slab that was not loaded during the fire testswas evaluated by means of additional 3 points bending tests. In the past, stress-strain models of concrete under fire loading have been proposed by several researchers. Comparisons are made with the load-displacement relations of RC slabs after fire loading using the existing stress- strain models with temperature, such as Schneider, EUROCODE 2, Lie, Shi and Nan model. By comparing the load- displacement relations, Lie model wasfound to result in a maximum load about 2.0% higher than that of test. Based on the fire test results of RC slabs, this paper presents an extensive analytical study on the fire response of box culvert during and after fires