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RE: Roof Framing, Joist Spacing...Input please

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In my experience, the deck failed while placing the concrete. After the deck
was welded. My caution to my colleagues remains intact.

Regards,

Bill Allen, S.E. (CA #2607)
ALLEN DESIGNS
Laguna Niguel, CA
http://www.AllenDesigns.com

||-----Original Message-----
||From: Scott E Maxwell [mailto:smaxwell(--nospam--at)engin.umich.edu]
||Sent: Saturday, July 22, 2000 9:46 PM
||To: seaint(--nospam--at)seaint.org
||Subject: Re: Roof Framing, Joist Spacing...Input please
||
||
||Also, while none of the notes specifically state it, I
||believe that table
||for the construction loads is for when the deck is
||UNATTACHED.  I could be
||wrong, but I find it difficult to believe that a 200 lb man could
||overstress a overspanned deck after it has been in place.  I
||would imagine
||that the situation that they are envisioning is after the
||deck pieces have
||been laid out on the framing and the construction worker is
||walking around
||either welding, screwing, or "shooting" the deck with powder/pnuematic
||fasteners.
||
||Scott Maxwell, PE, SE
||
||
||On Fri, 21 Jul 2000, c2 wrote:
||
||>     <<  I believe that the table that you are looking at
||("Recommended
||> Maximum Spans for Construction and Maintenance Loads
||Standard for 1 1/2" and
||> 3"Roof Deck") is for loads during construction to prevent damage.  I
||> certainly could be wrong.  >>
||>
||> You could very well be right on the money.  I note that
||stress is limited to
||> 26ksi, deflections to L/240 with a 200 pound (man?)
||concentrated load at mid
||> span on a 12 inch wide section of deck.  I find the double
||criteria a bit
||> confusing.  I would guess that the published maximum spans
||would be similar
||> to a metal building roof panel wherein workers can only
||walk on top of the
||> supporting roof purlins.  One cannot help but wonder how the roofing
||> materials are applied in some of these instances.
||>
||> Thanks for your thoughts on this matter.
||>
||>
||> Jimmy  C.......(hisself)
||>
||>
||>
||>
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