Hi Peteroznewman. Thank you so much for your reply. I turned on large deflection, and got some peak stresses larger than the yield strength of the steel (Structural steel 250MPa - Red Areas in the picture), so do you recommend me use NL Structural Steel in the whole tank, or just in some areas? Also, i use a displacement suport in the upper edge because it goes attached to the roof of the tank (also structural steel plates).
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