• 제목/요약/키워드: Fire-resistance

검색결과 1,030건 처리시간 0.034초

철골 철근콘크리트 보 및 철골철망 모르타르조 보의 전열특성 및 화재거동에 관한 실험적 연구 (An Experimental Study on The Fire Resistance Performance of Steel Encased Reinforcement Concrete and Steel Framed Mortar Beam with Loading Condition)

  • 김형준;김흥열;여인환;권기혁;권인규
    • 한국화재소방학회논문지
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    • 제26권1호
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    • pp.80-88
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    • 2012
  • 본 연구에서는 건축물의 피난 및 방화에 관한 규칙 제3조에 명시된 법정내화구조 중 보의 내화성능을 평가하고, 국내외 규정과 비교 및 분석을 하였다. 현행 규칙에 따르면 국내의 법정내화구조는 피난 및 방화구조에 관한 규칙의 시방기준을 만족하면 최대 3시간의 내화성능을 갖는 것으로 본다. 법정내화구조로서 보는 총 5개의 구조가 있으나, 본 연구에서는 우선 철근콘크리조를 대상으로 피복두께에 따른 내화성능을 평가하였다. 실험결과 하중비 0.5와 피복두께 40 mm를 확보할 경우, 최대 법정요구내화시간인 3시간을 만족하는 것으로 나타났다. 철골철망 모르타르조 보의 경우, 피복두께 60 mm 하중비 0.4에서 3시간 내화성능을 확보할 수 있다.

화재피해를 입은 철근콘크리트 단주시험체의 보수재료 적용 후 내화성능 평가 (Fire Resistant Performance after Application of Repaired Materials for Fire-Damaged Reinforced Concrete Column)

  • 심상락;류동우
    • 대한건축학회논문집:구조계
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    • 제36권5호
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    • pp.147-154
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    • 2020
  • Currently, there are no specific repair methods for RC structures damaged by fire, and repair methods are applied when durability deteriorates due to aging. In addition, a number of recent studies have been reported that have conducted fire resistance assessment of the repair materials themselves, assuming exposure to high-temperature environments such as fires. However, researches that evaluate the fire resistance performance of the repair materials by applying existing repair materials to the actual fire damaged reinforced concrete structures are very rare. Therefore, in this study, a number of existing repair materials were applied to fire-damaged concrete column to compare and evaluate the fire resistance performance with the original cover concrete.

CFRP로 보강된 철근콘크리트 휨부재의 내화성능 개선을 위한 실험 (Experiment for the Improvement of Fire Resistance Capacity of Reinforced Concrete Flexural Member Strengthened with Carbon Fiber Reinforced Polymer)

  • 임종욱;서수연;송세기
    • 대한건축학회논문집:구조계
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    • 제33권12호
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    • pp.19-27
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    • 2017
  • This paper is a study to improve the fire-resistance capacity of reinforced concrete (RC) members strengthened by fiber-reinforced-polymer (FRP). The fire resistance of the RC members strengthened by FRP was evaluated through high temperature exposure test. In order to improve the fire resistance of the FRP reinforcing method, a fire-proof board was attached to the reinforced FRP surface and then the high temperature exposure test was carried out to evaluate the improvement of the fire resistance performance. It was confirmed that the resistance to high temperature of NSMR could be improved somewhat compared with that of EBR from the experiment that exposed to high temperature under the load corresponding to 40% of nominal strength. When 30 mm thick fire-resistance (FR) board is attached to the FRP surface, the surface of the reinforced FRP does not reach $65^{\circ}C$, which is the glass transition temperature (GTT) of the epoxy until the external temperature reaches $480^{\circ}C$. In particular, when a high performance fire-proof mortar was first applied prior to FR board attachment, the FRP portion did not reach the epoxy glass transition temperature until the external temperature reached $600^{\circ}C$.

건축물 화재시 필요내화 시간 산정 및 간이식 도출 (Calculation of Fire-resisting Time and Extraction of Simple Transplants in the Event of a Building Fire)

  • 김윤성;한지우;김혜원;진승현;이병흔;권영진
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2020년도 가을 학술논문 발표대회
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    • pp.59-60
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    • 2020
  • Large fires continue to spread throughout the building, including the fire in Uijeongbu in 2015, the fire in Jecheon in 2017, and the fire in Miryang in 2018. According to the above fire case investigation, major problems were the fire resistance performance of compartment members such as fire doors, the fire spread due to damage to exterior wall openings, and smoke spread through vertical openings. However, in South Korea, only specification design is implemented for buildings that are not subject to performance design. In addition, the analysis of the fire resistance performance standards of building members in the specification design showed that fire doors were not specified in detail for 60 minutes of insulation performance and 60 minutes of fire resistance performance of E/V doors, limiting the prevention of fire spread. Therefore, the purpose of this research is to prepare measures to prevent the spread of fire by presenting simple transplants for calculating the required fire time according to the architectural design conditions for the performance design of the components of the fire room according to the purpose of use of the front of the building.

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Development and Application of CFT without Fire Protection using High Performance Steel and Concrete

  • Hong, Seok-Beom;Kim, Woo-Jae;Park, Hee-Gon
    • 한국건축시공학회지
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    • 제13권3호
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    • pp.272-281
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    • 2013
  • Concrete filled tube (CFT) columns, which consist of a steel tube filled with concrete, combine the benefits of the two materials. The steel tube provides a confining pressure to the concrete, while the local buckling of steel plate can be prevented by the concrete core. CFT columns also have a high fire resistance due to the heat storage effect of concrete under fire. For this reason, it is possible to develop CFT columns without fire protection measures. CFT columns without fire protection have many advantages, including quality control, cost reduction, better space efficiency and a shorter construction period. Due to these advantages, studies on the development of CFT columns without fire protection measures have been performed. However, CFT columns lose their bearing capacity under fire because the steel tube is exposed to the outside. As a result, the structure is collapsed, causing significant damage. In this research, we made a CFT column using high strength concrete (100 MPa) and high strength steel (800 MPa). We use steel fiber and nylon fiber with concrete to provide fire resistance. We perform the fresh concrete experiment and investigate the fire resistance of the CFT column (${\Box}400{\times}400{\times}15{\times}3000mm$) under loading. To investigate the effect of steel fiber on increasing fire resistance, we compare the fire resistance time according to the steel fiber. Through the test, it was found that the CFT specimen with steel fiber had better fire resistance performance than other cases.

화재진압시간에 따른 콘크리트의 염해저항성 평가 (Evaluation of Salt Damage Resistance of Concrete according to Fire Control Time)

  • 이준해;박동천
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2020년도 봄 학술논문 발표대회
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    • pp.109-110
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    • 2020
  • In the event of a fire, fire engines usually arrive within 15 minutes and become a fire suppressor. In this paper, an analytical model was established to evaluate the salt damage resistance of concrete according to fire suppression time, and the concentration of salt inside the concrete after fire was measured and the time to reach the critical concentration was assessed by how short.

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Fire Resistance Characteristics of Firewall Structure Associated with Impact Damage Induced by Explosion

  • Hye Rim Cho;Jeong Hwa Yoo;Jung Kwan Seo
    • 한국해양공학회지
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    • 제37권3호
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    • pp.99-110
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    • 2023
  • When a fire accident accompanied by an explosion occurs, the surrounding firewalls are affected by impact and thermal loads. Damaged firewalls due to accidental loads may not fully perform their essential function. Therefore, this paper proposes an advanced methodology for evaluating the fire resistance performance of firewalls damaged by explosions. The fragments were assumed to be scattered, and fire occurred as a vehicle exploded in a large compartment of a roll-on/roll-off (RO-RO) vessel. The impact velocity of the fragments was calculated based on the TNT equivalent mass corresponding to the explosion pressure. Damage and thermal-structural response analyses of the firewall were performed using Ansys LS-DYNA code. The fire resistance reduction was analyzed in terms of the temperature difference between fire-exposed and unexposed surfaces, temperature increase rate, and reference temperature arrival time. The degree of damage and the fire resistance performance of the firewalls varied significantly depending on impact loads. When naval ships and RO-RO vessels that carry various explosive substances are designed, it is reasonable to predict that the fire resistance performance will be degraded according to the explosion characteristics of the cargo.

콘크리트 압축강도 및 하중비에 따른 CFT기둥의 내화성능에 관한 연구 (The Study on the Fire Resistance Performance of the CFT (Concrete filled Tube) Column According to the Concrete Compressive Strength and Load Ratio)

  • 조경숙;김흥열;김형준;권인규
    • 한국화재소방학회논문지
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    • 제24권2호
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    • pp.44-51
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    • 2010
  • 본 연구의 목적은 성능적 내화설계를 기반으로 한 CFT 구조의 내화성능 설계기술 개발을 최종목표로 CFT 구조의 실증적 실험을 통한 내화성능을 도출하고 내부 콘크리트 압축강도와 하중비를 변수로 하여 수축량과 시험체 내부 온도를 측정하여 내화성능을 도출하여 성능설계를 위한 기초 자료로 활용하고자 하는데 있다. KS F 2257-1과 7의 기준에 따라 CFT 각형 기둥에 24MPa, 40MPa, 하중비 0.9, 0.6, 0.2를 재하하여 내화성능기준에 따른 결과 하중비 변화는 24MPa의 경우 하중비가 0.3 감소시 약 73분의 내화성능 향상효과가 있는 것으로 나타났다. 40MPa은 하중비 0.6, 0.2의 경우 내화성능시간은 31분, 180분으로 나타났다. 시험체 내부 콘크리트 강도 변화에 따른 내화성능평가 결과 강도가 증가할수록 내화성능은 감소하는 것으로 나타났다.

PSC 풍도슬래브에 부착된 내화패널의 내화특성에 관한 실험연구 (Experimental Study on the Fire Proofing Characteristic of Fire Resistance Panel that it attaches to PSC Airpit-Slab)

  • 이두성;배정;최헌;민인기
    • 대한토목학회논문집
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    • 제33권2호
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    • pp.465-473
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    • 2013
  • 본 연구에서는 터널에서 발생되는 화재로부터 구조물을 보호하기 위해 내화패널이 부착된 프리캐스트 PSC 슬래브의 내화성능을 조사하기 위해 내화실험이 수행되었다. 내화실험은 독일의 RABT(Richtlinien fur die Ausstatung und den Betrieb von stra${\beta}$entunneln) 화재시간-온도곡선을 적용하여 내화성능을 평가하는 것으로 하였다. ITA(2004)에서 제시하는 기준에 따라 내화성능 시험을 수행한 결과, 콘크리트의 손상을 판단하는 위치인 t=0mm의 최대온도는 $367^{\circ}C$로서 손상한계온도 $380^{\circ}C$(ITA 2004)이하였으며, 철근의 손상을 판단하는 위치인 t=25mm의 최대온도는 $239^{\circ}C$로서 손상 한계온도인 $250^{\circ}C$이하로 나타났다. 실험결과로부터, 25mm두께의 내화패널이 부착된 프리스트레스 슬래브 시험체는 내화성능을 가진 것으로 입증되었다.

석고보드 두께증가에 따른 벽체 내화성능 비교 (A Comparison of Fire Resistance for Wall According to Increase the Thickness of Gypsum Boards)

  • 최동호;최수경
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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    • pp.95-96
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    • 2019
  • In this study, fire resistance test according to KS F 2257-8: 2015 was carried out to compare fire resistance for wall consisted of gypsum boards with two types of drywall with gypsum boards which is based to lightweight studs. As a result, it was found that the fire resistance of the wall constructed with 12.5 mm of general gypsum board was 16 minutes higher than that of the wall constructed 9.5 mm in accordance with integrity and was 9 minutes higher than that of the wall(9.5 mm) depending on insulation. If the wall with the gypsum board 12.5 mm is constructed, it can be confirmed that the fire resistance is improved by about 43%.

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