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RE: ACI Chapt. 22
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- Subject: RE: ACI Chapt. 22
- From: "Rich Lewis" <seaint04(--nospam--at)lewisengineering.com>
- Date: Tue, 17 Mar 2009 17:37:37 -0500
I’m not sure if I’m addressing your question correctly.
As I understand it you want to know if the eccentricity of the axial force can
be outside the middle third of the wall thickness. I would look at this
as the virtual eccentricity of the load P caused by moment. If this is
what you’re asking then I believe the reason you must stay within the
middle third of the wall thickness is so that there is no tension force in
the wall. When the virtual eccentricity exceeds 1/6 from the centerline
of the wall there is tension stress in the concrete. Rich From: Richard Calvert
[mailto:RichardC(--nospam--at)lbbe.com] I’m
trying to check a plain (unreinforced) concrete basement wall for a large point
load. In Chapter 22 of the ACI-05 there appear to be two ways to approach
this. The seemingly obvious approach is with Eq. 22-14 – but when
considering the soil pressure and backing into the resultant vector, it does
not occur within the middle-third of the wall, as required by section
22.6.3. Is this what it being stated by this section? So my next step is
to use the equations per 22.5.3, as instructed in 22.6.3. but I find that
the use of A1 instead of Ag gives a much lower allowable compression. The
use of A1 in the context of a wall doesn’t make much sense to me.
Is it acceptable to use Ag ILO of A1 in this case? In
other words, is the correct calculation:
Thanks, Richard
Calvert, EIT |
- References:
- ACI Chapt. 22
- From: Richard Calvert
- ACI Chapt. 22
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