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RE: Corbels

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The 16th Edition of the AASHTO LFD code matches the ACI wording:  horizontal loop..
 
All of the AASHTO LRFD codes that I have (1st, 2nd, & 3rd editions) use the term "down".
 
If it is a mistake in the LRFD codes, then at least AASHTO has been consistent.  But I don't know if it is a mistake or a deliberate change.
 
David Finley
M. David Finley, P.E., P.A.
2086 SW Main Boulevard - Suite 111
Lake City, FL  32025
386-752-6400
-----Original Message-----
From: Will Haynes [mailto:gtg740p(--nospam--at)gmail.com]
Sent: Thursday, August 10, 2006 2:41 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: Corbels

I looked in an old AASHTO I have and it says the same as ACI does about the horizontal loop. Are you sure you are looking at the front face anchorage equirements in the AASHTO?
 
Will

 
On 8/10/06, M. David Finley, P.E., P.A. <davidfinley(--nospam--at)bizsea.rr.com> wrote:
Regarding the primary tension reinforcement in corbels,
 
ACI 318-02, 11.9.6 prvoides requirements for anchoring the primary tension reinforcement.  Item (b) states "By bending primary tension bars As back to form a horizontal loop"
 
The AASHTO LRFD Bridge Design Specifications (3rd Edition) 5.13.2.4.1 says in the commentary that the anchorage for developing reinforcement may include:  "Bending the primary bars down to form a continuous loop"
 
 
The way that I read this is that ACI requires a continuous loop in the horizontal plane while AASHTO requires the continuous loop to be in a vertical plan.  Am I reading these sections correctly?  Does each method offer some advantage over the other?
 
FWIW, I need to develop the primary tension reinforcement without welding, so the structural weld to a transverse bar is not an option for my application.
 
TIA,

David Finley
M. David Finley, P.E., P.A.
2086 SW Main Boulevard - Suite 111
Lake City, FL  32025
386-752-6400