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RE: TS column embedded in cmu wall

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Be careful of deflections.  With normal construction practice you will have mortar around the tube so that the wall and tube will move together.  CMU will crack with deflections exceeding L/600 (equivalent simple beam delta's).

Duane Siegfried, P.E., S.E.
Associate Manager, Strucural Engineering
Horner & Shifrin, Inc.
5200 Oakland Avenue
St. Louis, MO  63110
Phone:  314/531-4321
FAX:  314/531-6966
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-----Original Message-----
From: Dennis Pradere [mailto:dpradere(--nospam--at)]
Sent: Friday, February 07, 2003 10:16 AM
To: seaint(--nospam--at)
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.
-Dennis Pradere
MLA Engineering
Seattle, Washington