A quantification of the modelling uncertainty of non-linear finite element analyses of large concrete structures

Morten Engen, Max A N Hendriks, Jochen Köhler, Jan Arve Øverli, Erik Åldstedt

Research output: Contribution to journalArticleScientificpeer-review

29 Citations (Scopus)

Abstract

In order to make non-linear finite element analyses applicable during assessment of the global resistance of large concrete structures, there is need for a solution strategy with a low modelling uncertainty. A solution strategy comprises choices regarding force equilibrium, kinematic compatibility and constitutive relations. Relatively large solid finite elements and a fully triaxial material model for concrete were used in the present work. Bayesian inference was applied to results from 38 benchmark analyses. The results indicated that the modelling uncertainty could be represented as a log-normally distributed random variable with mean 1.10 and standard deviation of 0.12. A new method for characterizing the failure mode was developed. The results indicated that the physical uncertainties influenced the estimated parameters of the modelling uncertainty, and that this should be considered when other uncertainties are included in a reliability assessment.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalStructural Safety
Volume64
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • Bayesian inference
  • Characterization of failure mode
  • Global resistance
  • Large concrete shell structures
  • Modelling uncertainty
  • Non-linear finite element analyses

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