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RE: Question on Spirals in Columns

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Don't have the time to refresh myself on research on this, but I believe it
has to do w/the fact that higher-yield steel will result in a lower
volumetric ratio of transverse reinf., which is a bad thing when the major
functions of that reinf are core confinement & lateral support for
longitudinal steel.  Also, higher-yield steels have a smaller yield plateau,
which is also a bad thing when you're trying to maintain ductility.
Structural Engineer 
Defense Threat Reduction Agency 
Technology Development Directorate, Operational Applications Division, 
Structural Dynamics Branch 

6801 Telegraph Road                            Phone: (703) 325-0358     
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-----Original Message-----
From: Munoz, Pedro [mailto:pedro.munoz(--nospam--at)]
Sent: Tuesday, March 12, 2002 9:19 AM
To: 'seaint(--nospam--at)'
Subject: FW: Question on Spirals in Columns

In looking at the ACI Code provisions for spiral in RC columns it is noted
that the fy is limited to max of 60 ksi, which imposes very impractical
conditions for the final size of the spirals which is some cases could be as
large as # 7. Any comments to the ACI provisions on spirals ?



Pedro R. Muñoz, Ph.D., P.E.

Senior Structural Engineer


e-mail: pedro.munoz(--nospam--at)


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