1970's Era 7.5" Deep Deck

[TOLstryk]

I am working on a project where I am being asked to analyze the existing roof of a school building for introduction of new snow drifting loads. The building is a single story CMU bearing structure without beams. It is simply sheets of 7.5" steel deck spanning 32' to 34' between bearing walls. My limited Google searching didn't produce anything of value as far as historic load tables or manufacturers. Building is an early 1970's era project the Midwest. Has anyone encountered this or has any historic reference?

I was able to find 7.5" deep deck in a recent Canam deck catalog for 33 ksi yield and the capacities are dismal at these spans, which worries me. They are below the minimum current code balanced snow load.

 

[Greenalleycat]

Got a picture or sketch of this one?
I assume you mean it's 7.5" of concrete over a steel tray deck?
If so, I would agree that it hasn't got a shit show

 

[TOLstryk]

No concrete, just 7.5" deep corrugated steel decking. Looks like a standard 1.5" B deck profile except very deep. Or looks like a PZ sheet pile. Roofing materials directly on top are comprised of 1" rigid insulation and PVC membrane.

 

[bones206]

If you can measure the deck profile and gauge, you should be able to reverse-engineer the capacity using SDI design procedures for bare deck. A test coupon could give you actual yield strength.

 

[JedClampett]

Maybe you've found my old Robertson Catalogue. For the 7.5-inch deck, it tops out at 31 ft. But that's for the thinner gages.