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Re: slab on masonry

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Sharon,
 
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

Listers,
 
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
858/503-7854
858/503-7858 fax

Visit us on the web at www.arconengineers.com