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RE: Definition of Pier in ACI 53002
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 Subject: RE: Definition of Pier in ACI 53002
 From: "Joe Grill" <jgrill(nospamat)swiaz.com>
 Date: Thu, 3 Aug 2006 16:54:01 0700
O.K., I stumbled upon the answer to my own question, literally. I ran across the definition of a “foundation pier” in the 53002 definitions. So there it is, what I have is a foundation pier. Joe
Original Message
Pilasters
are not normally designed to resist inplane lateral loads like a Wall Pier or
Shearwall. If so, then design it as a frame column. On 8/3/06, Joe Grill <jgrill(nospamat)swiaz.com> wrote: I thought pilasters were for elements within a wall.
Original Message
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. On 8/3/06, Joe Grill < jgrill(nospamat)swiaz.com> wrote: I can't quite get my pea brain around the definition of a pier in the ACI 53002 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 31802, but the definition of a pedestal is clear.
Thanks, Joe
Joseph R. Grill, P.E. (Structural) Shephard  Wesnitzer, Inc. Civil Engineering and Surveying

 References:
 Re: Definition of Pier in ACI 53002
 From: Gerard Madden, SE
 Re: Definition of Pier in ACI 53002
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