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# Re: Geade beams per ACI 318-08 section 21.12.3.2

• To: <seaint(--nospam--at)seaint.org>
• Subject: Re: Geade beams per ACI 318-08 section 21.12.3.2
• From: Tom.Hunt(--nospam--at)fluor.com
• Date: Thu, 22 Apr 2010 14:39:24 -0700

Ravi,

Grade beams designed to act as horizontal ties between pile caps or footings shall be proportioned such that the smallest cross-sectional dimension shall be equal to or greater than the clear spacing between connected columns divided by 20, but need not be greater than 18 in........

I do not think your interpretation is correct.  They are describing a minimum value of clear spacing divided by 20 but cap the minimum at 18 inches not a maximum.

Thomas Hunt, S.E.
Fluor

David Topete <d.topete73(--nospam--at)gmail.com>
04/22/2010 02:20 PM
 To seaint(--nospam--at)seaint.org cc Subject Re: Geade beams per ACI 318-08 section 21.12.3.2

Sounds like a typo, but I don't have a copy of ACI 318-08.  Have they completely renumbered the sections?  In 318-05, there is no section 21.12.3.2...  I would guess that the minimum dimension is 18".  That would be silly to cap it at 18", don't you think?  If you have a 12" grade beam, then the stirrups are 6" out-to-out when you include 3" cover on either side...  Any reasonable plan reviewer could be this.

On Thu, Apr 22, 2010 at 1:47 PM, Vasu, Ravi <Ravi.Vasu(--nospam--at)jacobs.com> wrote:
List,

I have grade beams between pile caps in SDC D.   ACI 318-08 section 21.12.3.2 says,
the max. limit of least cross sectional dimension is 18 in.    Is there any reason

why the max. is set at 18 in.?  That means, we cannot have 24 in. or 30 in. (least)dimension?

Thanks

Ravi Vasu

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