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RE: Typical Stud Size for Embedded Plate

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Some contributions to this list are worth the wait.  

Thanks Mr. Sprague.

JPRiley

--- Harold Sprague <spraguehope(--nospam--at)hotmail.com> wrote:

> Deformed Bar Anchors are essentially weldable rebar.
>  They have the dimple 
> on the end and are shot on just like a headed stud.
> 
> I have specified weldable rebar in the past, but you
> really have to be on 
> top of that one.  A706 (truly weldable rebar) is
> still not that commonly 
> available.  If there are small lots (like with
> embeds), A706 is pricey and 
> you may not have it in your schedule.  You must
> request the mill certs, and 
> you must verify that they were the same bar welded
> in the shop.  You will 
> then get the argument that A615 is weldable.  It can
> be if the proper 
> procedures are used.  Most shops will not preheat
> correctly, and again you 
> have to get the certs in order to know the CE and
> get the proper pre-heat 
> and procedure.
> 
> I bitched about this in the field to an old project
> superintendent.  I told 
> him that the welds were brittle and a third could be
> knocked off with a 
> hammer.  He handed me a hammer and told me to go
> ahead and try on a newly 
> delivered frame with rebar embeds.  Each one I
> whacked made a pinging sound 
> as it fractured and went flying after one "fat boy"
> (too long at the desk) 
> blow with the hammer.
> 
> I have just seen it too many times in my 30 years of
> engineering and field 
> work.
> 
> I don't want to go to court, and be grilled as to
> why the hell I allowed 
> rebar to be welded in the field.  If I ever allow
> rebar to be welded in the 
> field these days, I demand the certs, I verify that
> the bar in the field 
> matches the certs, I require submitted written
> welding procedures, and full 
> time inspection.
> 
> Or I can require DBA's and go home and have a beer.
> 
> Regards,
> Harold Sprague
> 
> 
> 
> 
> 
> >From: "Bruce Holcomb" <bholcomb(--nospam--at)brpae.com>
> >Reply-To: <seaint(--nospam--at)seaint.org>
> >To: <seaint(--nospam--at)seaint.org>
> >Subject: RE: Typical Stud Size for Embedded Plate
> >Date: Thu, 18 Aug 2005 11:35:55 -0500
> >
> >Harold,
> >Why to recommend not welding rebar to the embed
> plate?  I don't design
> >many heavily loaded connections which might need
> rebar, but I've
> >approved many on shop drawing submittals.  Other
> than requiring weldable
> >rebar, are there other problems?
> >
> >
> >BDH
> >
> >-----Original Message-----
> >From: Harold Sprague
> [mailto:spraguehope(--nospam--at)hotmail.com]
> >Sent: Thursday, August 18, 2005 11:14 AM
> >To: seaint(--nospam--at)seaint.org
> >Subject: RE: Typical Stud Size for Embedded Plate
> >
> >Rich,
> >
> >If it is lightly loaded you could go down to 1/4"
> studs with 1/4" plate.
> >I
> >like to use the same thickness of plate as the
> studs.  (That is not an
> >absolute, but it keeps me out of trouble)  Precast
> and tilt-up is
> >generally
> >heavier, and I would not use it as an example of a
> light connection
> >plate.
> >You can use either studs or "deformed bar anchors".
>  Both can be shot
> >on.
> >Do not weld rebar to plates.  Use "deformed bar
> anchors" (DBA's).
> >
> >Check out:
> >http://www.studwelding.com/
> >http://www.nelsonstudwelding.com/literature.htm
> >for standard sized of studs or DBA's.
> >
> >I like to allow at lease 2" on the side for
> misplacement of the embed
> >plate.
> >   If you have the room, you can add a couple of
> #4's in each direction
> >parallel to the embed plate to intercept the
> failure plane of the shear
> >cone.
> >
> >Regards,
> >Harold Sprague
> >
> >
> >
> >
> >
> > >From: "Rich Lewis"
> <seaint03(--nospam--at)lewisengineering.com>
> > >Reply-To: <seaint(--nospam--at)seaint.org>
> > >To: <seaint(--nospam--at)seaint.org>
> > >Subject: Typical Stud Size for Embedded Plate
> > >Date: Thu, 18 Aug 2005 09:21:51 -0500
> > >
> > >I'm looking to embed some plates in a concrete
> foundation wall to
> >support
> > >some lightly loaded steel beams.  I would like to
> use headed studs
> >welded
> > >to
> > >a plate.  What is the typical size of stud used
> for embedded plates?
> >What
> > >is typically used in precast or tilt-up panels
> for most common plates?
> >Is
> > >there a typical detail for rebar added in the
> local area of the studs?
> > >
> > >
> > >
> > >Thanks!
> > >
> > >
> > >
> > >Rich
> > >
> > >
> > >
> >
>
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