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Re: seaint Digest for 29 Mar 2001

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I would be concerned with compatibility between the existing welds and new
screws.  The screw connection requires a certain amount of localized
deformation before becoming fully engaged / active, whereas the welds do
not.  There is a possibility that the welds would fail prior to the screws
being fully effective.  Same basic premise as the restrictions on using
welds and bolts in the same line of resistance in a steel connection.

Paul Feather

----- Original Message -----
From: "Matt Jordan" <MattJ(--nospam--at)>
To: <seaint(--nospam--at)>
Sent: Friday, March 30, 2001 9:22 AM
Subject: RE: seaint Digest for 29 Mar 2001

> greetings list members,
> a question regarding metal deck roofs. We are looking at upgrading a
> building in zone 4, tilt-up with metal deck roof. Bld. will be re-roofed,
> propose to add top seam welds (decrease existing spacing) to increase
> diaphragm capacity. Building is occupied by paper storage and owner is
> concerned about spark "showers" when welding. Question is, is it possible
> add screws in lieu of welds to increase capacity. It is old profile deck
> I think there is not enough lap for screws but not sure. Any suggestions?
> TIA,
> Matt Jordan SE