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FW: WWF in slabs on form deck

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Title: FW: WWF in slabs on form deck


For reinforcing in slabs on metal deck see SDI requirements.  I think that I remember .00075 times the area of concrete above the metal deck (I don't have a copy in front of me).  Of course this is only for nominal crack control and cracks should be expected over supports and also at girders.  Our office usually adds #3 bars over the tops of girders to keep cracks forming there tight.  Cracks do not seem to form over the supports in slabs that we've designed.

Curt La Count
Jacobs Engineering
Portland, OR

-----Original Message-----
From: CHRIS BOWERS [mailto:BOWERC(--nospam--at)]
Sent: Thursday, May 29, 2003 7:10 AM
To: seaint(--nospam--at)
Subject: WWF in slabs on form deck

I was wondering how others feel about the amount of WWF required in
slabs on metal form deck?  Take for example a 3" slab on 9/16" form
deck-if you look at the ACI criteria, 6.0x6.0x1.4x1.4 does not provide
enough area for temperature and shrinkage, you would need to go to the
2.9.  In talking to the engineer I work under, he has never had a
problem in the 18 years he has practiced with the 1.4.  I also called
another engineer at a metal deck provider and he said he has seen the
1.4 for over 40 years.  I am just trying to gauge how others feel about
this.  Thanks to all in advance for any help.

Chris Bowers, EIT
A/E Building Systems - Structures
L. Robert Kimball and Associates
Ebensburg, PA
Phone:814-472-7700 xtn.350

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