Your information is incomplete or in error "3 feet thick" is impossible to weld in any practical sense and is not sheet anyway it is a block. And 20x20 doesn't work as a silo unless it is to be curved to a cylinder 20 feet in circumference and 20 feet tall.
And 200 tons inside a cylinder is different from 200 tons on top of a cylinder and you don't name the material or give a density.
We don't know the shape.
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