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RE: Drop Panels

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Forgot to say why.  Bottom steel through the column core is a prescriptive requirement to prevent a sudden punching failure.  See ACI 318 13.3.8.5.
 

Scott M Haan P.E.
Plan Review Engineer
Building Safety Division
Development Services Department
Municipality of Anchorage
http://www.muni.org/building
phone:907-343-8183 
fax:907-249-7399
mailto:haansm(--nospam--at)ci.anchorage.ak.us

-----Original Message-----
From: Haan, Scott M. [mailto:HaanSM(--nospam--at)ci.anchorage.ak.us]
Sent: Friday, July 05, 2002 4:19 PM
To: 'seaint(--nospam--at)seaint.org'
Subject: RE: Drop Panels

If 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.
 

Scott M Haan P.E.
Plan Review Engineer
Building Safety Division
Development Services Department
Municipality of Anchorage
http://www.muni.org/building
phone:907-343-8183 
fax:907-249-7399
mailto:haansm(--nospam--at)ci.anchorage.ak.us

-----Original Message-----
From: Lutz, James [mailto:JLUTZ(--nospam--at)earthtech.com]
Sent: Friday, July 05, 2002 2:20 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Drop Panels

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.
 
 -----Original Message-----
From: Davin Weinhardt [mailto:yellowhumpy(--nospam--at)hotmail.com]
Sent: Wednesday, July 03, 2002 4:16 PM
To: seaint(--nospam--at)seaint.org
Subject: Drop Panels

Just out of curiosity, how many would say that a
4" drop panel below a 9 1/2" two-way slab needs
reinforcement? What if I added that there is no
drift issues? If you still say yes, please state
why (references would be great)!
 
Thanks in advance,
Davin