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A parametric study on buckling of R/C columns exposed to fire

Lijie Wang (UGent) , Robby Caspeele (UGent) and Luc Taerwe (UGent)
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Abstract
Buckling of concrete columns is a major issue in fire design, since heating of the columns will result in loss of stiffness and strength in the outer concrete layers. In the Dutch concrete code NEN 6720 (NEN, 1995), a quasi-linear theory of elasticity (KLE) method is provided for columns at ambient temperature. However, no literature is available showing whether this method could be adopted for elevated temperatures. Hence, an efficient calculation tool is needed to validate the applicability of this method in case of fire. As a first step, a cross-sectional calculation tool is introduced to calculate interaction curves of columns at ambient temperature. Further, the interaction diagrams obtained with this numerical method as well as the stiffness method provided in (Eurocode, 2004) and the KLE method are compared. Then, an assumed formula in the KLEmethod for the nominal stiffness calculation is discussed considering interaction curves of columns in case of an ISO 834 fire. Finally, parameters like the fire duration and the slenderness ratio are investigated.
Keywords
Buckling, interaction curves, KLE-method, the slenderness ratio, fire resistance

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Please use this url to cite or link to this publication:

MLA
Wang, Lijie, Robby Caspeele, and Luc Taerwe. “A Parametric Study on Buckling of R/C Columns Exposed to Fire.” Applications of Structural Fire Engineering, Proceedings. Ed. F Wald et al. 2015. 190–195. Print.
APA
Wang, Lijie, Caspeele, R., & Taerwe, L. (2015). A parametric study on buckling of R/C columns exposed to fire. In F Wald, I. Burgess, M. Jelcic Rukavina, D. Bjegovic, & K. Horova (Eds.), Applications of Structural Fire Engineering, Proceedings (pp. 190–195). Presented at the Applications of Structural Fire Engineering (ASFE 2015).
Chicago author-date
Wang, Lijie, Robby Caspeele, and Luc Taerwe. 2015. “A Parametric Study on Buckling of R/C Columns Exposed to Fire.” In Applications of Structural Fire Engineering, Proceedings, ed. F Wald, I Burgess, M Jelcic Rukavina, D Bjegovic, and K Horova, 190–195.
Chicago author-date (all authors)
Wang, Lijie, Robby Caspeele, and Luc Taerwe. 2015. “A Parametric Study on Buckling of R/C Columns Exposed to Fire.” In Applications of Structural Fire Engineering, Proceedings, ed. F Wald, I Burgess, M Jelcic Rukavina, D Bjegovic, and K Horova, 190–195.
Vancouver
1.
Wang L, Caspeele R, Taerwe L. A parametric study on buckling of R/C columns exposed to fire. In: Wald F, Burgess I, Jelcic Rukavina M, Bjegovic D, Horova K, editors. Applications of Structural Fire Engineering, Proceedings. 2015. p. 190–5.
IEEE
[1]
L. Wang, R. Caspeele, and L. Taerwe, “A parametric study on buckling of R/C columns exposed to fire,” in Applications of Structural Fire Engineering, Proceedings, Dubrovnik, 2015, pp. 190–195.
@inproceedings{6964291,
  abstract     = {Buckling of concrete columns is a major issue in fire design, since heating of the columns will result in loss of stiffness and strength in the outer concrete layers. In the Dutch concrete code NEN 6720 (NEN, 1995), a quasi-linear theory of elasticity (KLE) method is provided for columns at ambient temperature. However, no literature is available showing whether this method could be
adopted for elevated temperatures. Hence, an efficient calculation tool is needed to validate the applicability of this method in case of fire. As a first step, a cross-sectional calculation tool is introduced to calculate interaction curves of columns at ambient temperature. Further, the interaction diagrams obtained with this numerical method as well as the stiffness method provided in (Eurocode, 2004) and the KLE method are compared. Then, an assumed formula in the KLEmethod for the nominal stiffness calculation is discussed considering interaction curves of columns in case of an ISO 834 fire. Finally, parameters like the fire duration and the slenderness ratio are investigated.},
  author       = {Wang, Lijie and Caspeele, Robby and Taerwe, Luc},
  booktitle    = {Applications of Structural Fire Engineering, Proceedings},
  editor       = {Wald, F and Burgess, I and Jelcic Rukavina, M and Bjegovic, D and Horova, K},
  isbn         = {978-800106194-7},
  issn         = {2336-7318},
  keywords     = {Buckling,interaction curves,KLE-method,the slenderness ratio,fire resistance},
  language     = {eng},
  location     = {Dubrovnik},
  pages        = {190--195},
  title        = {A parametric study on buckling of R/C columns exposed to fire},
  url          = {http://dx.doi.org/10.14311/asfe.2015.029},
  year         = {2015},
}

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