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Re: Definition of Pier in ACI 530-02
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- Subject: Re: Definition of Pier in ACI 530-02
- From: "Gerard Madden, SE" <gmse4603(--nospam--at)gmail.com>
- Date: Thu, 3 Aug 2006 14:16:22 -0700
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
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
--
-gm
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