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Title |
Assessing the Fire Resistance of Reinforced Concrete Columns Considering Cooling-Phase Material Behavior
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Authors |
손운호(Un-Ho Son) ; 이승훈(Seung-Hoon Lee) ; 김한수(Han-Soo Kim) |
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DOI |
https://doi.org/10.4334/JKCI.2026.38.3.313 |
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Keywords |
내화성능; 보 요소; 냉각 후 해석; 비가역적; 철근콘크리트 부재 fire resistance performance; beam element; after-cooling analysis; irreversible; reinforced concrete member |
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Abstract |
We examined the influence of irreversible material behavior during the cooling phase on the fire resistance of reinforced concrete columns. While conventional fire resistance assessments primarily focus on the heating phase, this research incorporated both the thermal and mechanical characteristics that arise during cooling. Four material models were developed by combining reversible and irreversible material properties based on EN 1992-1-2, and seventy-four column specimens were evaluated using the Duration of Heating Phase index. The analysis revealed that additional structural degradation occurs during the cooling phase, with mechanical irreversibility exerting the most significant influence on the reduction in fire resistance. These findings highlight the need to incorporate irreversible material behavior into post-fire structural evaluations in order to avoid overestimating residual structural capacity.
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