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Re: TS column embedded in cmu wall

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Dennis,
Be careful of building masonry tight to steel framing.  I have seen many instances where this leads to cracking of the masony because of: 1) differential movement due to thermal effects, 2) shrinkage of the CMU, 3) stiffness mismatch between the steel and masonry under load... and perhaps others.   I'd either give the TS column some more room (perhaps a larger unit) or consider a pilaster to handle the load?
 
Dave Woodham
Atkinson-Noland & Assoc.
----- Original Message -----
Sent: Friday, February 07, 2003 9:15 AM
Subject: TS column embedded in cmu wall

Hello all,
 
I am designing a TS column to cantilever from the top of a cmu wall.  The column will be embedded in a cmu vertical cell down to the foundation where it will be attached with a baseplate.  A TS5x5 (which I need for my design) should fit into the cell of an 8" cmu block but that doesn't leave much room for grout around the column.
 
Also, for ease of construction, I am thinking of allowing the mason to build the wall around the column without a face shell and then attaching the face shell later.
 
I would be interested in anybody's experiences with each of the above and their recommendations.
 
Thanks,
 
-Dennis Pradere
MLA Engineering
Seattle, Washington