FRP로 보강된 철근콘크리트보의 열전도해석 및 내화성능 평가
Heat Conduction Analysis and Fire Resistance Capacity Evaluation of Reinforced Concrete Beams Strengthened by FRP
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초록
본 연구의 목적은 해석적 방법을 통하여 내화 재료의 특성을 파악하고 섬유 강화 폴리머로 보강된 철근콘크리트의 보의 적절한 내화설계 방법을 제안하는 것이다. 이를 위해, 내화재료의 가열실험을 실시하고 유한요소해석을 통해 열전도율과 비열을 구하고 또한 고온에서 FRP로 보강된 철근콘크리트 보 실험체에 대한 유한요소 해석을 통해 실험결과와 해석결과를 비교하였다. 이 과정에서 실험과 해석적 접근의 신뢰성을 확인하였다. 최종적으로 FRP로 보강된 철근콘크리트 보의 열적특성을 제안된 해석 방법으로 분석하고 고온으로 감소된 휨내력을 계산하였다. 최종적으로 제안된 방법을 이용하여 FRP로 보강된 부재에서 고온 노출시 열특성을 반영한 부재의 열전도를 파악하고 이를 이용하여 내력을산정할 수 있는 것으로 나타났다.
Abstract
The object of this paper is to find the characteristics of fire proof materials through an analytical method and to suggest a proper approachfor fire-proof design of reinforced concrete beam strengthened with fiber reinforced polymer (FRP). Heating tests for fire-proof materials were conductedand the thermal conductivities and specific heats of them were simulated through finite element analyses. In addition, a finite element analysis on thebeam specimen strengthened with FRP under high temperature, which was conducted by previous researchers, was performed and the analytical resultwas compared with test result. And then the compatibility of the analytical approach was evaluated. Finally, the heat resistance characteristic of RCbeam strengthened with FRP was analyzed by the proposed analytical method and the strength decrease of the beam due to the high temperature wasevaluated. From the comparison with analytical and test result, it was found that the heat transfer from outside to inside through the fire-proof materialscan be suitably simulated by using the proposed analytical approach.
참고문헌 (11)
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