Fire Resistance Of High Strength Concrete Columns Subjected To Moderate Axial Restraint

Research output: Contribution to journalArticle

Abstract

The first part of this article presents the results of an experimental researchexecuted on 42 high strength concrete columns. The parametric experimental study investigates the performance of high strength concrete columns under three loading levels 0.2, 0.4, and 0.6 subjected to moderate axial restraint degree = 0.1 and exposed to two heating rates. The second part of the article presents a three-dimensional finite element model of the reinforced concrete columns taking into account exposure to high temperatures. The effects of tension softening is included in the model and based on Hordijik, Cornelissen,and Rienhardt curve. The concrete columns were modeled taking into account the embedded reinforcement, and cracks formation using smeared cracks model which allowed a non-linear transient structural analysis to be conducted.The comparison of the results of the FEM and the performed tests showed a reasonable agreement and divergence in some cases due to concrete spalling. An assessment of the compressive stresses generated due to axial restraint under fire is also presented in the article. The experimental and the FEM study showed that imposing axial restraint against concrete columns expansion may reduce explosive spalling of concrete in fire.
LanguageEnglish
Pages79-103
JournalJournal of Applied Fire Science
Volume18
Issue number1
Publication statusPublished - Jan 2008

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flammability
Fire resistance
high strength
Concretes
Spalling
spalling
Fires
Finite element method
Heating rate
Compressive stress
Crack initiation
Structural analysis
crack initiation
Reinforced concrete
reinforcement
structural analysis
Reinforcement
softening
divergence
Cracks

Cite this

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title = "Fire Resistance Of High Strength Concrete Columns Subjected To Moderate Axial Restraint",
abstract = "The first part of this article presents the results of an experimental researchexecuted on 42 high strength concrete columns. The parametric experimental study investigates the performance of high strength concrete columns under three loading levels 0.2, 0.4, and 0.6 subjected to moderate axial restraint degree = 0.1 and exposed to two heating rates. The second part of the article presents a three-dimensional finite element model of the reinforced concrete columns taking into account exposure to high temperatures. The effects of tension softening is included in the model and based on Hordijik, Cornelissen,and Rienhardt curve. The concrete columns were modeled taking into account the embedded reinforcement, and cracks formation using smeared cracks model which allowed a non-linear transient structural analysis to be conducted.The comparison of the results of the FEM and the performed tests showed a reasonable agreement and divergence in some cases due to concrete spalling. An assessment of the compressive stresses generated due to axial restraint under fire is also presented in the article. The experimental and the FEM study showed that imposing axial restraint against concrete columns expansion may reduce explosive spalling of concrete in fire.",
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Fire Resistance Of High Strength Concrete Columns Subjected To Moderate Axial Restraint. / Ali, Faris; Nadjai, Ali.

In: Journal of Applied Fire Science, Vol. 18, No. 1, 01.2008, p. 79-103.

Research output: Contribution to journalArticle

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