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세라크울 보드를 적용한 아라미드 섬유 보강 철근콘크리트 기둥의 내화성능
민정기,노광근,최성모 한국복합신소재구조학회 2020 복합신소재구조학회논문집 Vol.11 No.1
최근 들어 아라미드 섬유 시트는 건설 산업에 쉽게 사용되고 있다. 아라미드 섬유 시트는 높은 특성강도 및 강성, 높은 부식 저항성능, 경량 및 자기적 투명성과 같은 많은 장점을 제공한다. 본 연구에서는 아라미드 섬유 시트의 난연성능 및 접착강도가 연구되었다. 아라미드 섬유 보강 콘크리트 기둥의 내화성능은 표준 및 외부화재 곡선에 대해 서로 다른 조합의 보드두께와 종류로 제작된 6개의 실험체를 사용하여 연구되었다. 그 결과 아라미드 섬유 시트는 마감재료를 이용해서 한 시간의 내화성능을 가지는 것으로 나타났다. Recently, aramid fiber sheets are readily available for use in the construction industry. These sheets offer many advantages such as high specific strength and stiffness, high corrosion resistance, light weight, and magnetic transparency. In this study, fire retardance performance and bond strength of aramid fiber sheets are analyzed. The fire resistance of aramid fiber-reinforced concrete columns is investigated using six test specimens manufactured with different combinations of board thickness and types that are then tested against standard and external fire curves. The results show that the sheets can resist fire for one hour using finishing materials.
고온에 노출된 대형합성기둥의 잔존면적에 대한 수치해석 연구
민정기,염경수,최성모 한국복합신소재구조학회 2017 복합신소재구조학회 학술발표회 Vol.2017 No.04
This study develops numerical model of mega composite columns in fire and investigates the residual areas below 500℃ after 3 hours. In order to perform heat transfer analysis, thermal properties of steels and concrete were adopted from Eurocodes. In addition to, the temperature distributions of composite columns with respect to fire tests were compared with numerical analysis results. As a result, the residual areas below 500℃ of mega composite columns were evaluated.
프리스트레스트 콘크리트 슬래브의 내화성능 예측에 대한 해석적 연구
민정기,박민재,주영규,Min, Jeong-Ki,Park, Min Jae,Ju, Young K. 한국공간구조학회 2017 한국공간구조학회지 Vol.17 No.1
In fire design for floors, the three criteria of stability, integrity and insulation are required for the specified fire resistance duration. Among these, stability is not easy to confirm. For solid prestressed concrete slabs of uniform thickness, Eurocode 2 provides tabulated data and specifies an axis distance to the centroid of strands to achieve particular fire resistance ratings, but it is not clear if this data can be used for a wide range of different prestressed slab profiles. In order to verify the current code-fire ratings for precast prestressed slabs, both simple and advanced calculation methods are investigated. This paper examines the use of calculation methods, accounting for the real behaviour of unprotected simply supported prestressed concrete slabs exposed to the standard ISO 834 fire. The calculated fire resistance of each prestressed concrete slab is compared with tabulated data in Eurocode part 1.2, with detailed discussion.
민정기,우영제,Min, Jeong-Ki,Woo, Young-Je 한국공간구조학회 2015 한국공간구조학회지 Vol.15 No.3
Numerical model on precast prestressed concrete (PC) hollowcore slabs using 11.3 mm diameter 7-wire stand was developed based on finite element analysis. In order to validate the modelling, previous experiment results with respect to prestressed solid concrete slabs were used and compared throughout the course of fire exposure. In addition to, the fire performance of hollowcore slabs with different aggregate types, moisture contents and compressive strength of concrete was investigated. As a result, it can be seen that the type of aggregates and moisture contents used in hollowcore slabs can affect the fire performance as well as temperature developments.