Architecture is primarily the design, AFAIK. Actual structural design is left to civil and structural engineers. At least when it comes to public works, you have to have your P.E/S.E. license to work on that sort of stuff
Yeah, the architects are just the celebrities who come up with weird ideas for how it should look, then take the credit after the civil engineers have done all the hard work of figuring out how to actually build the thing!