A space truss model of hipped roofs is much simpler than a finite element
model. See "Manual of Stressed Skin Diaphragm Design" by Davies and Bryan.
> I agree with the above for gable roofs but must once again ask a question
> asked here before: how do you handle a diaphragm on a "hipped roof"? The
> resulting boundary reactions are much more difficult to obtain by
> simple free body diagrams for such a multi-planar roof. To date I have
> not seen a "simple" answer to this problem. (The not-so-simple answer
> is to do a finite element analysis.)