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RE: Large Rebar Detailing

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ACI use to require development of stirrups above mid-height but no longer requires that for stirrups of #5 or smaller bars.  I thought the development requirement was a good one.  I know of a project where the engineer had a lot of stirrups in an 8” high beam and that was when there was a development requirement.  Fortunately the contractor had more sense and built it other than as drawn.  See ACI 12.13.  CRSI also recommends that you use four vertical legs for beams between 24” and 47” wide.

 

Roger C. Davis

Architect

 

 

205 N. Dewey St.

Eau Claire, WI 54703

P (715) 832-1605

F (715) 832-7850

 

-----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