Numerical model of thermoelastic-plastic concrete material

Juri Kajaste-Rudnitski

Research output: Book/ReportReport

Abstract

The objective of the employment of a sophisticated finite element method (FEM) program for structure fire resistance evaluation is to compliment, if not to substitute for altogether, the expensive fire tests of the natural size structural elements. Unfortunately the temperature dependent material options, provided by FEM programs, can be directly applied only to the steel and other materials with the similar hardening behaviour under compression and tension, For such materials as concrete with a hardening under compression and softening (cracking) under tension only cold numerical models exist and they cannot be used for the structure fire resistance evaluation. Instead the temperature dependent concrete model can be created in a separate subroutine and then inserted into the main program. Actually the thermoelastic-plastic concrete material was developed in two versions: first, the experimentally defined temperature functions of compressive and tensile strength. Young's modulus and thermoplastic (transient) strains were used as input data and then the standard thermoelastic stress analysis (ABAQUS) was performed. Second, the temperature dependent strength and Young's modulus were input as previously and the thermoplastic flow was computed in a subroutine following the ABAQUS algorithm for the compressive and tensile stress state taking into account the temperature dependence of the parameters involved. The computed results (displacements) were compared to the measured ones with resonable difference between.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages49
ISBN (Print)951-38-4392-0
Publication statusPublished - 1993
MoE publication typeNot Eligible

Publication series

SeriesVTT Publications
Number154
ISSN1235-0621

Fingerprint

Numerical models
Concretes
Plastics
Fire resistance
Subroutines
ABAQUS
Thermoplastics
Hardening
Compaction
Temperature
Elastic moduli
Finite element method
Stress analysis
Compressive stress
Tensile stress
Compressive strength
Fires
Tensile strength
Steel

Keywords

  • construction materials
  • concretes
  • numerical analysis
  • models
  • calculations
  • computer programs
  • finite element analysis
  • thermoelasticity
  • thermoplastics
  • composite materials
  • high strength concretes
  • fire resistance
  • fire tests
  • structural analysis
  • temperature
  • compressive strength
  • tensile strength
  • tension
  • hardening (materials)
  • ABAQUS
  • FEM

Cite this

Kajaste-Rudnitski, J. (1993). Numerical model of thermoelastic-plastic concrete material. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 154
Kajaste-Rudnitski, Juri. / Numerical model of thermoelastic-plastic concrete material. Espoo : VTT Technical Research Centre of Finland, 1993. 49 p. (VTT Publications; No. 154).
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abstract = "The objective of the employment of a sophisticated finite element method (FEM) program for structure fire resistance evaluation is to compliment, if not to substitute for altogether, the expensive fire tests of the natural size structural elements. Unfortunately the temperature dependent material options, provided by FEM programs, can be directly applied only to the steel and other materials with the similar hardening behaviour under compression and tension, For such materials as concrete with a hardening under compression and softening (cracking) under tension only cold numerical models exist and they cannot be used for the structure fire resistance evaluation. Instead the temperature dependent concrete model can be created in a separate subroutine and then inserted into the main program. Actually the thermoelastic-plastic concrete material was developed in two versions: first, the experimentally defined temperature functions of compressive and tensile strength. Young's modulus and thermoplastic (transient) strains were used as input data and then the standard thermoelastic stress analysis (ABAQUS) was performed. Second, the temperature dependent strength and Young's modulus were input as previously and the thermoplastic flow was computed in a subroutine following the ABAQUS algorithm for the compressive and tensile stress state taking into account the temperature dependence of the parameters involved. The computed results (displacements) were compared to the measured ones with resonable difference between.",
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Kajaste-Rudnitski, J 1993, Numerical model of thermoelastic-plastic concrete material. VTT Publications, no. 154, VTT Technical Research Centre of Finland, Espoo.

Numerical model of thermoelastic-plastic concrete material. / Kajaste-Rudnitski, Juri.

Espoo : VTT Technical Research Centre of Finland, 1993. 49 p. (VTT Publications; No. 154).

Research output: Book/ReportReport

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Kajaste-Rudnitski J. Numerical model of thermoelastic-plastic concrete material. Espoo: VTT Technical Research Centre of Finland, 1993. 49 p. (VTT Publications; No. 154).