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# RE: clip angles with tension

• To: <seaint(--nospam--at)seaint.org>
• Subject: RE: clip angles with tension
• From: j.grill(--nospam--at)attbi.com
• Date: Fri, 27 Dec 2002 16:17:16 +0000

```Brian,

Thanks for your reply.  Actually, I do have a copy of that publication and dug
it out of "the archives" last night.  I pretty much answered my question about
the welds.  I was also able to find the answer to the other question about
block shear.  It was a reply from Charlie Carter to a thread titled "Single
Plate Connection of Collectors Procedure".  Basically, he says there is no
codified approach, but he would determine the thickness required for block
shear due to the shear loading, then determine the thickness required for
block shear due to the tension loading, then take the square root of the sum
of the squares to get the final thickness requirement.  At this point I'm not
as concerned (for various reasons)with prying (if any) with the connection,
but will continue looking in to it as I go along.

Thanks again,
Joseph R. Grill, PE
> 	I am not sure about your block shear question.  Unless I am missing
> something, you should be able to check this condition using standard AISC
> formulas.
>
> 	For the welds on the clips:
>
> 	Assume the welds to consist of lines.  Determine the Area of the welds
> per
> thickness which is the length.  Determine the moment on the welds.  If the
> resultant passes through the centroid of the welds, this will be zero.
> However, if you are using the uniform force method for designing the
> connection, it prob. will not.  Determine S for the welds as a function of
> thickness (in^3/in thickness).  Determine the bending stress in the welds fb
> = M/S.  This will give you stress/in of length.  Determine the normal stress
> in the welds, fn = Prying Force/A, stress per inch.  Determine the shear
> stress on the welds, fv = Shear/A, stress per inch.  Determine the resultant
> force on the welds, which is sqrt((fb + fv)^2 + fn^2).  This will give you
> the average stress per unit length of weld.  You can then determine the
> throat thickness of the fillet weld.
>
> 	If you can get a copy of "Solutions to Design of Weldments" by the James
> F.
> Lincoln Arc Welding Foundation this explanation may make more sense.  There
> are a number of examples in the book as well as equations for determining
> the properties of welds treated as lines.
>
> Brian K. Smith, P.E.
>
> > -----Original Message-----
> > From: j.grill(--nospam--at)attbi.com [mailto:j.grill(--nospam--at)attbi.com]
> > Sent: Thursday, December 26, 2002 6:35 PM
> > To: seaint(--nospam--at)seaint.org
> > Subject: clip angles with tension
> >
> >
> > I have a gusset to column connection consisting of a gusset attached to a
> > double clip angle.  The clip angles are welded to the supporting
> > member and
> > bolted to the gusset.  The loads to the gusset are from diagonal bracing,
> > therefore, I have both shear and tension on the clip angles.  I
> > guess I have
> > two questions.  First, how do I resolve the block shear
> > requirements (tension
> > and shear) at the bolted legs?  I seem to remember a thread concerning
> > something like this but I can't find it. The second question is
> > how would the
> > design of the welds to the supporting member be done with both shear and
> > tension on the weld group.  The angles welded on three sides with
> > some prying
> > action is what I am seeing now, but my brain is a little foggy from the
> > holidays and can't quite get the design straight in my mind.
> >
> > Thanks,
> > Joseph R. Grill, PE
> >
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