• Fire Science and Engineering
• /
• v.26 no.6
• /
• pp.72-77
• /
• 2012

When the concrete and steel combined composite beam is exposed to high temperature, concrete could delay temperature rising of steel by covering or increase heat capacity of structural member. For becoming of structural reinforcing by unification between materials, fire resistance rate of composite beam would be higher than simple steel beam. The temperature rising of exposed steel of composite beam is directly related with section shape and exposure length of steel. In this study, fire resistant tests were carried out for composite beams and steel beam with same thickness of spray-type fire resistant materials in standard fire, and after that, temperature histories were analysed and compared with shape factor. The correlation between steel temperature and shape factor was showed very high. This result suggests that if it can be predict the comparative advantage of member by factor which cause the performance enhancement, it could be conclude that an Standard Accreditation method can be adjust to members without indivisual certifiicate of accreditation.

• Journal of Korean Society of Steel Construction
• /
• v.20 no.3
• /
• pp.365-375
• /
• 2008

The main objective of this paper is to study the behaviour of yLRC composite columns at elevated temperatures by experimental test. The effects of load ratios, cross-section size and fire protection for the yLRC columns were investigate d by the test and compared using the heat transfer analysis perfo rmed based on the finite element program ANSYS 10.0 using the ISO834 standard fire curve, following the main guidelines proposed by the EC4 Part 1.2. As heat transfer is the movement of heat by conduction, convection, and radiation, and as temperature inside an object varies by position and time, time. As the steel's thermal conductivity is higher than that of concrete, steel loses its strength rapidly in a high-temperature situation such as a fire. Fire resistance performance of the yLRC composite column under fire conditions was evaluated througheat transfer analysis for parametric study.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.7 no.2
• /
• pp.165-176
• /
• 2005

A variety of research projects have been undertaken due to the recent catastrophic tunnel fires throughout the world, Among them, more emphasis was given to full scale and scale model fire experiments, and recently the area of fire resistance of tunnel structures attract more interests, On the contrary to the cases in most of the advanced countries where design standards as well as recommendations have already been announced, no local criteria for design can be found, This paper aims at deriving the fire characteristics appropriate for the assessment criteria of fire resistance of structures in local tunnels through studying the existing fire temperature curves including ISO 834 standard temperature curve, HC curve, RWS curve, ZTV curve and EBA curve.

• Magazine of the Korea Concrete Institute
• /
• v.14 no.2
• /
• pp.30-36
• /
• 2002

콘크리트가 화재에 노출될 경우 가열에 의한 재질의 노화 및 열팽창에 의한 열응력의 발생에 따라 주요구조부인 기둥 및 보에 큰 손상이 생기게 되어 그 내력은 크게 저하하게 된다. 철근 콘크리트 구조물의 화재 상황을 조사해 보면 (그림 1)과 같이 열응력에 의한 기둥의 전단파괴, 보의 휨파괴 및 부재의 폭열 등이 보여진다.(중략)

• Journal of Korean Society of Steel Construction
• /
• v.9 no.3 s.32
• /
• pp.341-350
• /
• 1997

The objective of this study is to investigate the structural behavior of the composite slabs with the new metal deckplate. The new deckplate can be used as structural member with topping concrete. So several experiments of this structural test and the fire resistance test were done. From this experiments. slabs with new metal deckpklate were verified as composite slabs. In this paper, this verifications were compared with the international design methods. For experiment. 49 specimens were made. the main parameters are deckplate thickness (1.2mm. 1.6mm) depth of topping concrete(85mm. 90mm). support condition(simple, 2-span), shear reinforcment(studs), span(2.7m, 3.0m, 3.3m. 3.6m. 3.9m) and shear span(L/3, L/4, L/7). We analyzed the structural behavior of composite slab throughout the moment-curvature relationship which is obtained with the program using the computer language. Turbo C. From this development for slab system, the reinforced concrete or steel structure building may be easy, economical for construction, And informations about the structural behavior of composite slabs will be utilized to established korea standard.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 2013.04a
• /
• pp.4-5
• /
• 2013

프리스트레스트된 프리캐스트 콘크리트 부재는 장경간이 가능하고 공장생산으로 품질관리가 용이하다. 그러나 프리스트레싱 텐던이 화재에 노출되는 경우 일반 철근에 비해 급격하게 강도를 상실해 구조물의 붕괴로 이어질 수 있다. 국내의 경우 실험에 기초한 내화성능에 대한 연구는 활발히 이루어지고 있으나 그에 반해 성능기반 설계법이 활성화 될 때 요구되는 수치해석적인 연구는 많이 부족한 실정이다. 따라서 본 연구에서는 문헌조사를 통해 이전에 수행된 실험 데이터를 통해 현재 외국에서 활발히 사용되는 수치해석 프로그램을 검증하고 수치해석 모델링을 통해 각각의 내화시간에 따른 적절한 피복 두께를 제안하였다.

• Journal of the Korean Ceramic Society
• /
• v.38 no.3
• /
• pp.238-244
• /
• 2001

본 연구에서는 Seed 첨가법에 의하여 제조된 mullite(Syn M)와 외국산 mullite 2종류(sintered mullite : SM, fused mullite : FM)를 고알루미나질 내화물 원료에 적용하여 내화물 시편을 제조하였으며 mullite에 따른 결정상, 미세구조, 부피비중, 강도를 조사하였다. SM, FM, Syn M의 mullite 함유량은 93.17%, 86.79%, 97.57%이었으며 mullite를 15 wt% 첨가하여 제조한 시편의 물성을 조사한 결과 Syn M을 함유한 시편이 꺾임강도 338.60 MPa, 압축강도 9,427kgf/$\textrm{cm}^2$을 나타내었다. 외국산 mullite를 첨가한 시편의 강도는 Syn M을 첨가한 것보다 약 5~10% 정도 낮은 강도를 보였다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 2012.04a
• /
• pp.46-49
• /
• 2012

지하대공간은 특수한 가연물 및 높은 밀도의 화재하중을 지닌 가연물이 많으나, 국내 내화성능기준은 이를 고려하지 않고 있다. 이에 본 연구는 슬래브실험체를 제작하여 표준가열곡선(ISO834)과 지하대공간의 화재하중을 고려한 화재조건으로 내화실험과 수치해석을 실시하였으며, 그 결과 모든 실험체에서 0.96~1.03로 10%내의 오차범위에 있는 것을 확인 할 수 있었다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 2012.04a
• /
• pp.125-128
• /
• 2012

국내 가동원전에서는 내화방벽 관통부의 성능이 적절하게 유지되도록 주기점검절차, 데이터베이스 등 발전소 상황에 적합한 관리방안을 수립하여 운영하고 있다. 이 중에서 내화방벽 관통부 유지관리용으로 구축된 데이터베이스는 관통부 유지관리에 필요한 필수정보가 수록되어 있으나 관통부 담당자의 개인 관리도구로 활용되고 있으므로 실효성 향상이 필요하다. 본 논문에서는 이러한 점을 보완하기 위하여 발전소 구조물, 관통부 등의 3차원 형상정보(3-dimensional Plant Model)를 활용하여 시각적인 관리 편의를 향상시키고, 웹 기반(Web-based)의 관통부 정보 구축을 통하여 발전소 수준(Plant-level)에서 관리가 가능한 관통부 관리시스템 개발 사례를 기술하였다.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2023.05a
• /
• pp.327-328
• /
• 2023

In this paper, the effect of change of sleeve type on fireproofing performance of through-penetration firestop system on metallic pipes was analyzed. As a result, if the material of the sleeve is high in thermal conductivity and thick, a large amount of heat is transferred to the top of the support structure.