Title
Treatment of modelling uncertainty of NLFEA in fib Model Code 2020
Author
Engen, M.
Hendriks, M.A.N.
Monti, G.
Allaix, D.L.
Publication year
2021
Abstract
When non-linear finite element analyses are used in design of new or assessment of existing concrete structures, one should account for the modelling uncertainty before conclusions are drawn based on the results. The present article describes the basis for how this topic is treated in the draft of fib Model Code 2020. There are two components of the modelling uncertainty: (i) within-model, and (ii) between model. The within-model uncertainty was estimated from a range of series of benchmark analyses gathered from the literature. Each series was assumed ana lyzed in a consistent manner, termed as the solution strategy. The main result for the within-model component, is a set of prior parameters for Bayesian updating. In an application setting, the prior parameters should be updated after validating the selected solution strategy with a suite of relevant benchmark analyses, before using the mean and coefficient of variation in the Global Factor Method or calcu lating the modelling uncertainty factor γRd to be used in the Partial Factors Method. Finally, results from blind-prediction competitions were studied. With the present data, it cannot be concluded that a-priori knowledge of the experi mental outcome reduces the uncertainty in the prediction. Hence, there is no need for compensating for this effect by a separate partial factor
Subject
Design of concrete structures
Model Code 2020
Modelling uncertainty
Non-linear finite element analyses
Safety format
Buildings and Infrastructures
2015 Urbanisation
To reference this document use:
http://resolver.tudelft.nl/uuid:d42e7026-5437-4b38-abd2-79b1a0f88728
DOI
https://doi.org/10.1002/suco.202100420
TNO identifier
967655
Publisher
John Wiley and Sons Inc
ISSN
1464-4177
Source
Structural Concrete, 22 (22), 3202-3212
Document type
article