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RE: Large Rebar Detailing

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In bridge bent caps, it is common (at least here in Texas) to use #5
stirrups, particularly in the larger caps.  If #4 stirrups are used, not
only can the spacing get fairly tight, I have heard that the cages can
be rather flexible, making them difficult for the contractor to handle.
Using #5s makes the cage more stiff, so it's easier to tie the cage on
the ground, then lift it into place.

-- Joel

----------------------
Joel Adair, P.E.
Halff Associates, Inc.
Dallas, Texas
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-----Original Message-----
From: Rich Lewis [mailto:seaint02(--nospam--at)lewisengineering.com] 
Sent: Wednesday, May 11, 2005 12:46 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Large Rebar Detailing


Thanks for all the helpful comments.

The responses brought up a few more questions.

Do these large bars come in 40 ft. lengths?

Is it ever practical to use a #5 stirrup in a beam?  I don't see it
illustrated in the CRSI manual or the ACI Handbook.  I have 30" wide
beams.

Rich Lewis


-----Original Message-----
From: Mark D. Baker [mailto:shake4bake(--nospam--at)earthlink.net] 
Sent: Wednesday, May 11, 2005 11:05 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Large Rebar Detailing

Due to the large lap length for bars of this size you may want to
consider a coupler to join bars. 

For caisson work, the cage can become so heavy we will often do our best
to eliminate laps thereby reducing cage weight and easing installation.

Mark D. Baker
Baker Engineering





From: Rich Lewis [mailto:seaint02(--nospam--at)lewisengineering.com] 
Sent: Wednesday, May 11, 2005 8:51 AM
To: seaint(--nospam--at)seaint.org
Subject: Large Rebar Detailing

I am detailing some concrete beams and columns with #10 - #14 bars.  I
usually don't detail these large bars.  Are there any words of wisdom
someone can share about things to consider using this size bar?  I know
one thing I saw in the past is the sweep radius of large bar hooks can
cause problems.  Anything else I should be sure to consider?  I do have
a beam and column joint to detail.

Thanks.


Rich Lewis

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