Closed form adaptive effectiveness factor for numerical models

Morten Andersen Herfelt, Peter N. Poulsen, Linh C. Hoang

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Abstract

Concrete does not exhibit rigid-plastic behaviour, but it is nevertheless convenient to assume so for practical design and analysis. In order to account for the actual behaviour, a so-called effectiveness factor is introduced, which have been approximated for various standard problems. For general numerical analysis, however, a different approach is needed, where the actual stress and strain fields are taken into account. Using a recently developed formulation, the implications are analysed for the Mohr-Coulomb yield criterion and a closed-form approximation for use in finite element limit analysis is proposed. The reduced yield surface is compared to the closed-form approximation for various choices of reinforcement layouts.
Original languageEnglish
Publication date2018
Number of pages11
Publication statusPublished - 2018
EventThe International Federation for Structural Concrete 5th International fib Congress - Melbourne, Australia
Duration: 7 Oct 201811 Oct 2018
Conference number: 5

Conference

ConferenceThe International Federation for Structural Concrete 5th International fib Congress
Number5
CountryAustralia
CityMelbourne
Period07/10/201811/10/2018

Keywords

  • Yield surface
  • Effectiveness factor
  • Optimisation
  • Finite element

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