Light gage roof bracing
Light gage roof bracing
(OP)
The architect wants trusses supporting purlins and metal roofing which gives me nothing for diaphragm strength. The building is 80x30 with shear walls on each end. I need 500plf on the ends of the "diaphragm". I have been looking at bracing with angles, but I end up needing them across the entire roof, which actually seems reasonable. This seems like very typical construction for metal building with moment frames, but I don't like it in this application. I don't really have a ceiling diaphragm option. Any advice on an efficient bracing pattern or should I switch to the steel deck and ditch the purlins altogether?






RE: Light gage roof bracing
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Light gage roof bracing
RE: Light gage roof bracing
RE: Light gage roof bracing
RE: Light gage roof bracing
RE: Light gage roof bracing
An expert is a man who has made all the mistakes which can be made in a very narrow field
RE: Light gage roof bracing
RE: Light gage roof bracing
RE: Light gage roof bracing
RE: Light gage roof bracing
the purlins, blocking, angle bracing comes in at 2.4 psf.
The angle bracing system adds a lot of axial load to the top chords of the trusses, which will need some checking, where as the deck, in my thinking,
will not increase axial load in the top chords, accept at the gable end/shear wall truss. In addition, I've got some pretty decent loads on my angle bracing connections at the shear walls. I have a meeting later and we will see where we end up. It's all due tomorrow of course and the architect probably doesn't want to update his drawings at this point.
RE: Light gage roof bracing
RE: Light gage roof bracing
The deck it is. The arch didn't care at this point, he just wants the drawings.
thanks again.
RE: Light gage roof bracing
RE: Light gage roof bracing
RE: Light gage roof bracing