Steel Deck Diaphragm Fasteners
Steel Deck Diaphragm Fasteners
(OP)
I'm trying to figure out the appropriate wind interaction loading on a roof deck fastener when calculating the attachment pattern.
By ASCE definition I know diaphragms are main wind and fasteners are C&C. So do I use main wind for shear loading and C&C for uplift loading and use that in the interaction equation. Or do I use main wind shear and uplift for the interaction and then check the fastener separately for pullout, pullover, etc. using C&C uplift.
Can you even combine MWF and C&C in same interaction?
By ASCE definition I know diaphragms are main wind and fasteners are C&C. So do I use main wind for shear loading and C&C for uplift loading and use that in the interaction equation. Or do I use main wind shear and uplift for the interaction and then check the fastener separately for pullout, pullover, etc. using C&C uplift.
Can you even combine MWF and C&C in same interaction?






RE: Steel Deck Diaphragm Fasteners
Think about the interaction....even though a purist might consider that you wouldn't mix the two for any reason, think about what is causing the loading. For instance, if the shear is being caused by movement of the frame (diaphragm) and tension is being caused by C&C uplift, then apply those.
RE: Steel Deck Diaphragm Fasteners
RE: Steel Deck Diaphragm Fasteners
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: Steel Deck Diaphragm Fasteners
My question stemmed from a seminar I sat through and the new roof deck design manual. In their example, although they don't actually do the wind calc, they provide zone 1, 2 and 3 pressures which is obviously C&C.
The fact that MWF loads are an average pressure like you said KootK makes me believe you can have MWF and C&C in the same event. It just depends on what you are checking. Therefore using MWF for shear and C&C for uplift seams reasonable.
RE: Steel Deck Diaphragm Fasteners
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.