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RE: CMU Site Wall using 2001CBC

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We just completed a podium structure (concrete basement with retaining walls and slab roof supporting an apartment) and used an amplification factor of 2.5 assuming the hx /hr =0 .5. This would represent the average acceration response of a wall pinned at the top wall. The mass of the wall is lumped at the center. I think for the cantilevered wall hr=hx  A lot of these walls fell over in Northridge, primarily due to lack of reinforcement and inadequate foundations.

"Sherman, William" <ShermanWC(--nospam--at)cdm.com> wrote:
Yes, I would use hx = 0 for a component "attached" at grade.

William C. Sherman, PE
(Bill Sherman)
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)cdm.com


> -----Original Message-----
> From: Molly Skinner [mailto:MSkinner(--nospam--at)kpff-irvine.com]
> Sent: Friday, April 30, 2004 11:35 AM
> To: seaint(--nospam--at)seaint.org
> Subject: CMU Site Wall using 2001CBC
>
>
> I am designing a free-standing site wall using the 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?
>
> Molly Skinner, P.E.
> Irvine, CA
>
>
>
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