Tuesday, October 9, 2007

RE: concrete drop panels

Really? Concrete columns are cheaper than steel tubes? Wow. With all the
labor to create the cage and forming, I thought the opposite would be true.

Mark E. Deardorff, SE
R & S Tavares Associates, Inc
9815 Carroll Canyon Road
Suite 206
San Diego, CA 92131
Phone: 858-444-3344
Phone: 209-863-8928
mark@rstavares.com
www.rstavares.com

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> -----Original Message-----
> From: refugio rochin [mailto:fugeeo@gmail.com]
> Sent: Tuesday, October 09, 2007 6:54 AM
> To: seaint@seaint.org
> Subject: concrete drop panels
>
> Thanks bye the way for all of the 8" columns input. Not sure
> if I learned anything, but interesting to see people's
> different input...
> I am usually concerned with that issue on residential
> buildings. lots of architects like skinny columns !
> concrete is much cheaper than steel tubes... I think I might
> look at the column with a P-Delta load plus the P, and see if
> it can take it. Also to look at buckling...
>
> Concrete Drop Panels
>
> ACI has a drop panel requirement:
>
> Section 13.3.7.2 - Projection of drop panel below the slab
> shall be at least one-quarter the slab thickness beyond the drop.
> ???
> This wording has confused me. I think however, that it means
> the drop panel, to be considered a drop panel, shall be at
> least a 1/4 of the slab thickness, so if I have an 8" slab,
> then the drop panel shall be at least 2", giving an overall
> depth to the panel of 10" which includes the slab... no???
>
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