I can use different techniques to refine the FEA model so that it correctly calculates stresses in critical regions. That's just a matter of how detailed/complex I want to make the model. So the stress level from the FEA is correct. It is how to compare this stress and deformation result with Eurocode 3 that is not clear. There are a few paragraph's in Appendix C of "EN 1993-1-5: General rules - Plated structural elements" that mention how to use FEA for Eurocode, but how to establish a dimensioning criteria is not explicitly described.
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