Computers and Concrete

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Simplified P-M interaction curve model for reinforced concrete columns exposed to standard fire

  • Lee, Deuck Hang (Department of Architectural Engineering, University of Seoul) ;
  • Cheon, Na-Rae (Metallic Materials and Mechanical Engineering Team, Korea Testing & Research Institute) ;
  • Kim, Minsu (Department of Architectural Engineering, University of Seoul) ;
  • Lee, Jungmin (Department of Architectural Engineering, University of Seoul) ;
  • Oh, Jae-Yuel (Department of Architectural Engineering, University of Seoul) ;
  • Kim, Kang Su (Department of Architectural Engineering, University of Seoul)
  • Received : 2017.01.08
  • Accepted : 2017.02.15
  • Published : 2017.05.25
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Abstract

In the authors' previous study, an axial force-flexural moment (P-M) interaction curve model was proposed to evaluate fire-resisting performances of reinforced concrete (RC) column members. The proposed method appeared to properly consider the axial and flexural strength degradations including the secondary moment effects in RC columns due to fire damage. However, the detailed P-M interaction curve model proposed in the authors' previous study requires somewhat complex computational procedures and iterative calculations, which makes it difficult to be used for practical design in its current form. Thus, the aim of this study was to develop a simplified P-M interaction curve model of RC columns exposed to fire considering the effects of fire damage on the material performances and magnitudes of secondary moments. The simplified P-M interaction model proposed in this study was verified using 66 column fire test results collected from literature, and the verification results showed that the proposed simplified method can provide an adequate analysis accuracy of the failure loads and fire-resisting times of the RC column specimens.

Keywords

Acknowledgement

Supported by : Ministry of Land, Infrastructure and Transport of Korean government

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Cited by

  1. Seismic response of concrete columns with nanofiber reinforced polymer layer vol.20, pp.3, 2017, https://doi.org/10.12989/cac.2017.20.3.361