For that you'll have to consider the mass of an average individual at the radius of the station. Easy peasy. Only the individual will feel the effect of the centripetal force. The structure, as Error said, will be counterbalanced by itself.
Thus you have the F, the mass of an average person and the radius from construction...your velocity is easy solution now. Yes, the generic force will vary, but to the slightest, i beleive, as the most of your numerator comes form the velocity.
