I have been looking into the idea of a timber frame structure that is essentially round, probably with supports radiating out from a central pillar (fire place?). I know that there are historical structures more or less allong this line but I have not found any examples of anyone doing this this sort of structure with modern materials and practices. Is anyone? I'm thinking a polygonal structure with maybe 16 eight foot sides. It also occurs to me that the radial design would result in nonuniform loading on the horizontals, not quite sure how to account for that. Information on any examples of structures allong these lines or engineering and design considerations would be much appreciated.