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Re: In-Slab Ducts in P/T Slabs

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I have included ducting in suspended slabs in the past.  You need to consider the section properties at the locations concerned and design the element accordingly.  You may also end up with a "hollow core slab" type of construction if you have larger or more numerous "holes".  I have always laid out the ducts (usually 3" to 4" ducts in bundles) to minimize the impact on the cross sectional properties.

Thor Tandy  P.Eng  MCSCE
Victoria BC
-----Original Message-----
From: Jeff Creagan <jeffc(--nospam--at)>
To: SEAOC Listserver <seaint(--nospam--at)>
Date: Friday, July 30, 1999 9:30 AM
Subject: In-Slab Ducts in P/T Slabs

We have been asked on several recent projects about the feasibility of introducing in-slab mechanical ducts (i.e. 2" x 12") into our flat plate post-tensioned concrete slab design.  Apparently, this is a system that is very common in Canada, where they are utilized in conventional mildly reinforced slabs.  Any opinions?