Non-linear finite element analyses applicable for the design of large reinforced concrete structures

M Engen, M. A.N. Hendriks, Jan Arve Øverli, Erik Åldstedt

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
47 Downloads (Pure)

Abstract

In order to make non-linear finite element analyses applicable during assessments of the ultimate load capacity or the structural reliability of large reinforced concrete structures, there is need for an efficient solution strategy with a low modelling uncertainty. A solution strategy comprises choices regarding force equilibrium, kinematic compatibility and constitutive relations. This contribution demonstrates four important steps in the process of developing a proper solution strategy: (1) definition, (2) verification by numerical experiments, (3) validation by benchmark analyses and (4) demonstration of applicability. A complete solution strategy is presented in detail, including a fully triaxial material model for concrete, which was adapted to facilitate its implementation in a standard finite-element software. Insignificant sensitivity to finite element discretisation, load step size, iteration method and convergence tolerance were found by numerical experiments. A low modelling uncertainty, denoted by the ratio of experimental to predicted capacity, was found by comparing the results from a range of experiments to results from non-linear finite element predictions. The applicability to large reinforced concrete structures is demonstrated by an analysis of an offshore concrete shell structure.

Original languageEnglish
Pages (from-to)1-23
Number of pages23
JournalEuropean Journal of Environmental and Civil Engineering
DOIs
Publication statusE-pub ahead of print - 21 Jul 2017

Keywords

  • large concrete shell structures
  • modelling uncertainty
  • Non-linear finite element analyses
  • practical applications
  • structural design
  • ultimate load capacity

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