I am working on a project which is made up of a number of curves of varying radii. There are several porches or verandas with semi circular plans. All of them have conical roofs supported at 1/4 points (+/-) on columns. In elevation they are each a series of stone arches, with the keystones falling in between the columns. So the arches also arch OUT, with the large keystones as much as a footand a half out of plane at the centerline from the springlines(?). I have searched the web for info on arches. and I have found some stuff on in-plane arches...but I can find nothing that helps me understand these. I am not sure the arches are actually "arching", in other words I do not believe that all of the elements are in compression, and I believe that the keystone has a resultant outward thrust on it. But frankly, I am not even sure how to prove that. Someone provided a detail calling for tension stitching, but I am not sure what that is or what it does, and I am not comfortable just accepting that "it worked before, so it is ok," which is what the architect wants me to do. (there are cracks at the joints at the ends of the arches built by this method before, that says to me that it ISN'T working). I would welcome any help.
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