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# Re: Definition of Pier in ACI 530-02

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• To: seaint(--nospam--at)seaint.org
• Subject: Re: Definition of Pier in ACI 530-02
• From: Scott Maxwell <smaxwell(--nospam--at)engin.umich.edu>
• Date: Thu, 3 Aug 2006 17:32:40 -0400 (EDT)

```I think Gerard is right on.  The definition is to allow differentiation
between a pier and column, which have different requirements in the
Strength Design portion of ACI 530.

Regards,

Scott
Adrian, MI

On Thu, 3 Aug 2006, Gerard Madden, SE wrote:

> Piers are generally for thin elements like walls of concrete or cmu. THis is
> more of a column with the dimensions in both directions being fairly close.
> See UBC/CBC section 1921 for the wording they use. The oddball part of your
> thing is the length is only 30" high, therefore its a pedestal. If it were
> taller, then it would just be a column.
>
> If it's less than 3x it's thickness, it's a column
> If it's greater than 6x it's thickness, it's a shearwall
> If it's height is greater than 5x it's length, then its a column again.
>
>
> Think of a 4 foot stretch of a wall that's 6-8" thick, that's a pier or
> "Wall Pier" in this case
>
> -gm
>
> On 8/3/06, Joe Grill <jgrill(--nospam--at)swiaz.com> wrote:
> >
> >  I can't quite get my pea brain around the definition of a pier in the ACI
> > 530-02 document.  It states:
> >
> >
> >
> > "An isolated vertical member whose horizontal dimension measured at right
> > angles to its thickness is not less than 3 times its thickness nor greater
> > than 6 times its thickness and whose height is less than 5 times its
> > length."
> >
> >
> >
> > I have a "pier" that is 24"x28"x 30" high.
> >
> >
> >
> > I see the thickness=24", L=28", h=30"
> >
> >
> >
> > 3 x thickness = 72"
> >
> >
> >
> > 6 x thickness = 144"
> >
> >
> >
> > 5 x L = 140"
> >
> >
> >
> > The horizontal dimension measured at right angles to its thickness = 28"
> > which is less than 72" therefore the way I read this this is not a pier.
> >
> >
> >
> > What am I not getting here?  I see a "pier" as being the same as a
> > "pedestal" in ACI 318-02, but the definition of a pedestal is clear.
> >
> >
> >
> > Thanks,
> >
> > Joe
> >
> >
> >
> > Joseph R. Grill, P.E. (Structural)
> >
> > Shephard - Wesnitzer, Inc.
> >
> > Civil Engineering and Surveying
> >
> >
> >
> > <http://inet/index.htm>
> >
> >
> >
>
>
>
> --
> -gm
>

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