I guess my question wasn't clear. Aside from
column strip (top) reinf.
and aside from the 2 min. (bot) cont. bars, is
there a requirement for reinf.
at the bottom of the drop panel itself? Once
again, there are no drift
issues. The drop panel is proportioned per
ACI. In other words, is
there a problem with having 5 1/2" of
unreinforced clear cover below
the bottom layer of steel?
PS The building in question was peer reviewed and
came back from the
building department with no comments. It's no
wonder engineers get
treated as a commodity when our own
peers and plan checkers
thoughtlessly make comments about the integrity of another engineers
design. I only asked the question because most engineers throw in steel
----- Original Message -----
Sent: Friday, July 05, 2002 5:19
Subject: RE: Drop Panels
you have negative moment you need steel to resist it. Also you need at
least 2 continuous bottom bars in the column strip through the column
core. Also see ACI 318 Fig. 13.3.8. Tell me the buildings you
guys are designing without reinforcement in the drop panels so I can stay on
the top floor.
If there is no drift, and the moment stays negative over the
panel area, then the drop panel is always in compression, and you
shouldn't need steel in the drop panel.
From: Davin Weinhardt
Sent: Wednesday, July 03, 2002
Just out of curiosity, how many would say
4" drop panel below a 9 1/2" two-way slab
reinforcement? What if I added that there
drift issues? If you still say yes, please
why (references would be
Thanks in advance,