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RE: Residential Cantilevered Retaining Walls.

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It's been my experience that the floor slab is not in place when the wall is being loaded (i.e., the backfilling/compaction operation). Soooo...unless you specify that the slab is to be installed and cured before backfilling, I'm not sure it's a good idea to count on the slab for sliding resistance.
Just my two cents.
T. William (Bill) Allen, S.E. (CA #2607)
-----Original Message-----
From: Mark Miller [mailto:milm(--nospam--at)]
Sent: Tuesday, March 04, 2003 12:50 PM
To: 'seaint(--nospam--at)'
Subject: RE: Residential Cantilevered Retaining Walls.

Most basement walls that I do are daylight basements, where even if you can get the floor to support the top of the wall there may mot be any easy way to support the floor, so I usually design them as cantilevered walls (bar next to soil).  Most of the time I do get to take advantage of the slab at the bottom for slipping resistance.  If you calc the required support at the top most top supported walls will take a lot of anchor bolts, 4x sill plates and other fun  items that the contractor will resist using.  One thing I like to do is have the wall back filled before the upper floor is attached to allow the wall some free rotation, but truth be known, if the contractor over drills the anchor bolt holes "so they fit", this probably allows more rotation than anything.
Mark Miller, PE
Salem, Oregon
-----Original Message-----
From: Bill Marczewski [mailto:bmarczewski(--nospam--at)]
Sent: Tuesday, March 04, 2003 11:07 AM
To: SEOC Engineering Forum (E-mail)
Subject: Residential Cantilevered Retaining Walls.

I'm curious to know how the other people on the list design concrete retaining walls for residential structures.  If you design the wall as a cantilevered wall with reinforcing on tension face (soil side), then install the floor diaphragm it would seem you have just turned it into a restrained wall.  The restrained wall would appear to want the reinforcing on the opposite side (non-soil side).  Is anybody designing these as "Restrained Walls"?  If so, are you doing any special blocking where the joist is parallel to the wall beyond the first joist space?  Thanks for any comments received.

Bill S. Marczewski, P.E.
Peratrovich, Nottingham & Drage, Inc.
503-325-1250 Main; 503-325-9789 Fax