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Re: concrete drop panels

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Wesley, Tom, and Mark,
Thank you for the information! I really appreciate it. I could use the AISC manual, but a bit bulky for what I am doing at the moment. All I need is the shape detailing dimensions.
Thanks again,
Joe Grill
----- Original Message ----- From: "Mark Deardorff" <mark(--nospam--at)rstavares.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Tuesday, October 09, 2007 7:27 AM
Subject: 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(--nospam--at)rstavares.com
www.rstavares.com



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-----Original Message-----
From: refugio rochin [mailto:fugeeo(--nospam--at)gmail.com]
Sent: Tuesday, October 09, 2007 6:54 AM
To: seaint(--nospam--at)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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