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RE: slab on masonry

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I also use Paul's approach - design the slab as pinned at the wall, but still provide dowels from the wall into the slab at reinforced cells,  for crack control.

William C. Sherman, PE
(Bill Sherman)
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)


From: Paul Feather [mailto:pfeather(--nospam--at)]
Sent: Tuesday, September 13, 2005 6:11 PM
To: seaint(--nospam--at)
Subject: Re: slab on masonry

The masonry is not really stiff enough to act as a fixed connection, and if you did consider the connection fixed you would exceed the moment capacity of the wall section in a hurry.
We typically design the slab as pinned at the wall, then incorporate top steel (extended leg dowels) with the shear transfer reinforcing to mitigate any incidental cracking and provide a little extra moment capacity for the wall.
Not exactly scientific, more of a partial envelope solution.  We also try and minimize / balance end span length adjacent to the walls, as this makes the slab more economical and limits the rotation at the slab / wall connection.
----- Original Message -----
Sent: Tuesday, September 13, 2005 3:32 PM
Subject: slab on masonry

When supporting an elevated concrete slab on masonry walls, in the out-of-plane direction, what percent do you consider the slab fixed to the wall?

Sharon Robertson, PE
Arcon Engineers 
5625 Ruffin Road, Suite 130 
San Diego, CA  92123
858/503-7858 fax

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