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RE: 8" Columns

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8" - 2*1.5" (cover) - 2* 0.375" (ties) = 4 1/4"

Not much section left!

I've seen 8" sonotubes under a porch, but thats it.



David L. Fisher SE PE
Senior Director

Cape Cod Grand Cayman Holdings Ltd. - Cayman
Fisher+Partners Structural Engineers Ltd. - Cayman
372 West Ontario Chicago 60610
75 Fort Street Georgetown Grand Cayman BWI
319 A Street Boston 02210


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-----Original Message-----
From: refugio rochin [mailto:fugeeo(--nospam--at)gmail.com] 
Sent: Friday, October 05, 2007 12:21 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: 8" Columns

That is not true.  ACI 21.3.1.4 allows for a width of 10" for Flexural
members of special moment frames.
ACI 21.11 for Frame Members not proportioned to resist forces induced
by earthquake motions, does not place any restrictions on the minimum
dimensions.

I am mainly wondering how most people approach the design of such a
member that has to accept seismic displacements?  Is there any
research in the realm of 8" concrete members undergoing design
displacements, and their strength capacities?  I do not want to design
such a member and have it bust due to seismic loads and lose vertical
strength capacity...

-RR

2007/10/5, Gerard Madden, SE <gmse4603(--nospam--at)gmail.com>:
> 12" is the minimum dimension for a concrete structural member other than
> walls and slabs.
>
> -g
>
>
> On 10/5/07, refugio rochin < fugeeo(--nospam--at)gmail.com> wrote:
> >
> > I think I should explain a bit more...  8" Concrete Column.  The
> > column should be able to take the lateral deformation imposed by the
> > overall structure though, which is generally attached to a rigid
> > diaphragm ...
> >
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