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Practical Predictive Formulas for Residual Strengths of Fire-Damaged Normal Strength Reinforced Concrete Square Columns
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 Title & Authors
Practical Predictive Formulas for Residual Strengths of Fire-Damaged Normal Strength Reinforced Concrete Square Columns
Lee, Cha-Don; Lee, Seung-Whan; Lee, Chang-Eun;
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 Abstract
The behavior of concrete structures subject to fire is complex, depending on many factors. The factors usually considered in research include the level and endurance of temperatures in concrete and reinforcing bars, the mechanical properties of the steel and concrete, moisture contents, cover thickness, existence of eccentricity, and member geometry among others. Although there are a few sophisticated numerical models which can trace the effects of these important parameters on the residual capacity of reinforced concrete columns damaged by fire, practical predictive formulas are in need for rapid yet reasonable assessment in practice. The practical formulas are developed in this study for fire-damaged normal strength reinforced concrete square columns, which can approximate the predictions of those sophisticated numerical models with ease in use. The formulas take into account the effects of exposure time to fire, concrete strength, reinforcement ratio and sectional area. The developed formulas are seen to correlate with the predictions of numerical model in a reasonable agreement. Some examples are also presented in determining the residual strength, safety and additionally needed strengths for a fire-damaged reinforced concrete column.
 Keywords
fire;normal strength;predictive formulas;reinforced concrete column;residual capacity;
 Language
Korean
 Cited by
1.
하이브리드 섬유보강 고강도콘크리트 기둥부재의 내화성능,원종필;장창일;이상우;김흥열;김완영;

한국콘크리트학회논문집, 2008. vol.20. 6, pp.827-832 crossref(new window)
2.
폴리프로필렌섬유 혼입률에 따른 고강도콘크리트 기둥부재의 폭렬 및 내부온도 분포특성,원종필;장창일;;김흥열;김완영;

한국콘크리트학회논문집, 2008. vol.20. 6, pp.821-826 crossref(new window)
3.
하이브리드 섬유 보강 고강도 콘크리트 기둥의 내화성능,김정훈;신용석;문금환;박춘걸;김정섭;

대한건축학회논문집:구조계, 2011. vol.27. 5, pp.85-92
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