Computers and Concrete

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Improved phenomenological modelling of transient thermal strains for concrete at high temperatures

  • Nielsen, Claus V. (Danish Technological Institute) ;
  • Pearce, Chris J. (Department Civil Engineering, University of Glasgow) ;
  • Bicanic, Nenad (Department Civil Engineering, University of Glasgow)
  • Received : 2003.09.15
  • Accepted : 2003.03.31
  • Published : 2004.05.25
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Abstract

Several extensions to the Thelandersson phenomenological model for concrete under transient high temperatures are explored. These include novel expressions for the temperature degradation of the elastic modulus and the temperature dependency of the coefficient of the free thermal strain. Furthermore, a coefficient of thermo mechanical strain is proposed as a bi-linear function of temperature. Good qualitative agreement with various test results taken from the literature is demonstrated. Further extensions include the effects of plastic straining and temperature dependent Poisson's ratio. The models performance is illustrated on several simple benchmark problems under uniaxial and biaxial stress states.

Keywords

References

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