Element size and other restrictions in finite-element modeling of reinforced concrete at elevated temperatures

Josephine Voigt Carstensen, Grunde Jomaas, Pankaj Pankaj

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

One of the accepted approaches for postpeak finite-element modeling of RC comprises combining plain concrete, reinforcement, and interaction behaviors. In these, the postpeak strain-softening behavior of plain concrete is incorporated by the use of fracture energy concepts. This study attempts to extend this approach for RC at elevated temperatures. Prior to the extension, the approach is investigated for associated modeling issues and a set of limits of application are formulated. The available models of the behavior of plain concrete at elevated temperatures were used to derive inherent fracture energy variation with temperature. It is found that the currently used tensile elevated temperature model assumes that the fracture energy decays with temperature. The existing models in compression also show significant decay of fracture energy at higher temperatures (>400°) and a considerable variation in values. Application of the evaluated fracture energy values shows that these impose severe element size and reinforcement ratio limits. The effect of the limits is illustrated for a RC specimen. © 2013 American Society of Civil Engineers.
Original languageEnglish
JournalJournal of Engineering Mechanics
Volume139
Issue number10
Pages (from-to)1325-1333
ISSN0733-9399
DOIs
Publication statusPublished - 2013

Keywords

  • Concrete beams and girders
  • Concretes
  • Constitutive models
  • Crack initiation
  • Finite element method
  • Reinforced concrete
  • Reinforcement
  • Fracture energy

Fingerprint

Dive into the research topics of 'Element size and other restrictions in finite-element modeling of reinforced concrete at elevated temperatures'. Together they form a unique fingerprint.

Cite this