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Re: Plywood diaphragms

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I don't know of any limitations.  I have done 2 and 3 story steel framed
buildings with concrete floors and a wood trussed hipped roof, of similar
dimensions to yours.  From what I remember, the problems were diaphragm
shears, (I had to block portions of the diaphragm) and the attachment from
the diaphragm to the steel frame for both shear and wind uplift.

Conrad Guymon, P.E.

----- Original Message -----
From: "CDaniels" <ced(--nospam--at)>
To: <seaint(--nospam--at)>
Sent: Friday, February 23, 2001 2:35 PM
Subject: Plywood diaphragms

> Does anyone out there know if there is any code limitations to using a
> plywood roof diaphragm with wood or light gauge metal trusses and a
> structural steel frame?  I've never seen this done before or at least on a
> building this size.  I have a two story 110' by 120' steel frame building
> with a concrete slab on the second floor and light gauge metal or wood
> trusses sheathed with plywood at the roof.  The roof is a 3:12 hip.
> Any information would be appreciated.
> Christopher E. Daniels
> Larson Design Group
> ced(--nospam--at) <mailto:ced(--nospam--at)>