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RE: FW: CMU Site Wall using 2001CBC

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As you know the IBC, and BSSC have marched on while the UBC/CBC has been caught in a time warp. The UBC/CBC is still roughly based on the 1997 NEHRP. I believe that you can still look to the more up to date NEHRP's for guidance. The same 2 equations have been in the UBC and NEHRP for many cycles. They just tweak them a bit. Hx in the UBC is the same as z in NEHRP. Hr is essentially the same as h in NEHRP. (I feel like I am doing a translation from German to English.)

The 2000 NEHRP made it a bit more clear where they defined Z (hx for those who speak UBC) as "Height in structure of point of attachment of component. For items at or below the base, z shall be taken as 0. The value of z/h need not exceed 1.0." h is defined as hr in the UBC world.

Now bring on the Rosetta Stone;>)

Harold Sprague

From: "Molly Skinner" <MSkinner(--nospam--at)>
Reply-To: <seaint(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: FW: CMU Site Wall using 2001CBC
Date: Wed, 4 Aug 2004 10:44:23 -0700

I am designing a free-standing site wall using the (UBC/CBC) Fp equation
of section 1632.2.  I know the value of ap=1.0 and Cp=3.0 per Table
16-O, but what value of hx should be used?  The code states that hx is
the element of component attachment elevation with respect to grade, so
to me, that means that hx should be 0, and as a result the Fp,min
equation will govern.  I've read the blue book, plus looked at many
books, but this situation never sees to be addressed for free-standing
(non-building walls).  Is using hx=0 appropriate?  I had a plan checker
tell me that it isn't and should be using hx = hr.  Just curious what
others are doing.

Molly Skinner, P.E.
Irvine, CA

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