Bayes-based methodology to update seismic response of RC nuclear buildings
Résumé
The numerical prediction of the nonlinear behavior of structures under a given seismic load remains a very complex task regarding many aspects: the choice of the modeling strategy, the description of the soil behavior, the description of the soil-structure-interaction, the induced structural effects, the description of the reinforced concrete behavior under cyclic loadings, etc. Such complexity, coupled with the inherent and intrinsic randomness of material properties, usually induces a gap between the blindly modeled quantities of interest and the ones measured or observed (when measurements are available). To reduce such gap, one might increase the accuracy of the used physical models (using different models, adding more physical phenomena, etc.) and/or improve this knowledge of the model’s inputs leading to the observed responses. In this work, we assume that the used model is sufficiently complex to be considered physically representative (main physical phenomena are accounted for already). Therefore, we consider that the lack of knowledge concerns mainly the used inputs and that is the issue that needs to be addressed. Eventually, this work focuses mainly on available tools and methods to solve the issue of updating the inputs of seismic behaviour models based on the acquired data (experimental observations preferably or in situ data from post-earthquake survey if experimental evidence is not available) expressed in terms of displacements, strains, forces, etc. The Bayesian approach is one of the most relevant and widely used technique. In this paper, it is applied to adjust material properties in the model of SMART2013 mock-up (3-story reinforced concrete structure at the scale 1/4) leading to a better quantification of the median properties of concrete at the structural level and a clear reduction of epistemic uncertainties based on the feedback provided by experimental measurements during successive seismic loads.
Domaines
Sciences de l'ingénieur [physics]Origine | Fichiers produits par l'(les) auteur(s) |
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