Friday, November 6, 2009

Re: pull-out bars

You are talking about the typical practice like tilt-up wall panels that may or may not be stacked during concrete placement and during erection the slab dowels are pulled up from the surface to between 45 to 90 degrees creating slab dowels.  Back construction days when I built 50 -100 projects with panels using this system. You could say it was the standard in the LA /Southern California area.
Still to this day I see it being used all over. Yes a better engineering solution would be to use a screw in dowel such as Richmond came up with in the mid seventies. But getting the contractor to use them was near to impossible. The cost of each assemblage cost and how to hold in place during the pouring process.  They were more accepted for cast-in-place walls and slabs where you had a surface to secure them to.
Joe Venuti
Johnson & Nielsen Associates
Palm Springs, CA
In a message dated 11/5/2009 8:34:52 P.M. Pacific Standard Time, writes:
I am referring with the re-bending embedded rebar's.

From: Bob Freeman <>
Sent: Friday, November 6, 2009 12:15:22
Subject: pull-out bars

Hi Noy:


Are you referring to a process that a threaded insert could provide?  A threaded insert could be threaded to a hooked bar in the wall/column and then after the wall is poured, a beam re-bar could be threaded into the same insert. I would design a corbel to hold the vertical reaction of the beam in the second pour as well.


We have done this successfully on several projects.


If you are re-bending an embedded rebar, the second bend after the first pour would severely weaken the rebar.



Bob Freeman, AIA, EIT



From: Noy Tiglao []
Sent: Thursday, November 05, 2009 12:42 PM
Subject: pull-out bars


Is there provision in ACI or any standard/code that allows 'pull-out bars'? i am refering to a reinforcing bar that is bent and embedded in concrete wall/column, and then pull it out to connect/splice the  reinforcing bar of a beam or slab. (personally, i do not agree with this approach but some engineering firms allow it) please give me insight. thanks.


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