Experimental research on post-fire behaviour of reinforced concrete columns

Yih Houng Chen, Yun Fei Chang, George C. Yao, Maw Shyong Sheu

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

This paper reports an experimental research into the effect of fire exposure time on the post-fire behaviour of reinforced concrete columns. Nine full-size reinforced concrete columns (45×30×300 cm) with two longitudinal reinforcement ratios (1.4% and 2.3%) were unexposed and exposed to the ISO 834 standard fire for 2 and 4 h with a constant preload. One month after cooling, the specimens were tested in axial load combined with uniaxial or biaxial bending. The test results show that the residual load-bearing capacity decreases with increase in fire exposure time. This deterioration in strength following an increase in fire exposure time can be slowed down by the strength recovery of hot rolled reinforcing bars after cooling. In addition, the reduction in residual stiffness is higher than that in ultimate load; consequently, much attention should be given to the deformation and stress redistribution of the reinforced concrete building subject to earthquakes after a fire.

Original languageEnglish
Pages (from-to)741-748
Number of pages8
JournalFire Safety Journal
Volume44
Issue number5
DOIs
Publication statusPublished - 2009 Jul 1

Fingerprint

Reinforced concrete
Fires
Loads (forces)
axial loads
Cooling
cooling
Concrete buildings
Axial loads
Bearing capacity
reinforcement
deterioration
Deterioration
stiffness
Earthquakes
Reinforcement
earthquakes
recovery
Stiffness
Recovery

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Safety, Risk, Reliability and Quality
  • Physics and Astronomy(all)

Cite this

Chen, Yih Houng ; Chang, Yun Fei ; Yao, George C. ; Sheu, Maw Shyong. / Experimental research on post-fire behaviour of reinforced concrete columns. In: Fire Safety Journal. 2009 ; Vol. 44, No. 5. pp. 741-748.
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Experimental research on post-fire behaviour of reinforced concrete columns. / Chen, Yih Houng; Chang, Yun Fei; Yao, George C.; Sheu, Maw Shyong.

In: Fire Safety Journal, Vol. 44, No. 5, 01.07.2009, p. 741-748.

Research output: Contribution to journalArticle

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AB - This paper reports an experimental research into the effect of fire exposure time on the post-fire behaviour of reinforced concrete columns. Nine full-size reinforced concrete columns (45×30×300 cm) with two longitudinal reinforcement ratios (1.4% and 2.3%) were unexposed and exposed to the ISO 834 standard fire for 2 and 4 h with a constant preload. One month after cooling, the specimens were tested in axial load combined with uniaxial or biaxial bending. The test results show that the residual load-bearing capacity decreases with increase in fire exposure time. This deterioration in strength following an increase in fire exposure time can be slowed down by the strength recovery of hot rolled reinforcing bars after cooling. In addition, the reduction in residual stiffness is higher than that in ultimate load; consequently, much attention should be given to the deformation and stress redistribution of the reinforced concrete building subject to earthquakes after a fire.

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