8"x8" RC columns with Fc'=10000psi has more
compressive strength than a 3000 psi 12"x12" column.
The 8" column would be more expensive i am sure but Architects sometimes
limits dimesions for aesthetic reasons.
Alex C. Nacionales
----- Original Message -----
From: "David Fisher" <dfisher@fpse.com>
To: <seaint@seaint.org>
Sent: Saturday, October 06, 2007 1:22 AM
Subject: RE: 8" Columns
> 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
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> -----Original Message-----
> From: refugio rochin [mailto:fugeeo@gmail.com]
> Sent: Friday, October 05, 2007 12:21 PM
> To: seaint@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@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@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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>> --
>> -gm
>
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