Structural Engineering: RE: concrete drop panels

Yes...I interpret it the same way...if you have an 8" slab, your drop panel
should be at least 2" thick (25% of the thickness of the slab).

Regards,

Scott
Adrian, MI

-----Original Message-----
From: refugio rochin [mailto:fugeeo@gmail.com]
Sent: Tuesday, October 09, 2007 9:54 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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Tuesday, October 9, 2007

RE: concrete drop panels