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Re: Fillet Welds

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To quote the AISC connections manual

" The critical stress in a fillet weld is always considered to be a shear
stress, and may occur:
(1) parallel to the weld axis, (2) transverse to the weld axis, (3) or at
some intermediate angle.  Therefore, tension, compression, and moments
acting upon a fillet welded joint are always resolved as shear in the weld
throat."

The process for treating a weld as a line is clearly outlined in Blodgett's
Design of Welded Structures, and a quick review of either Blodgett's text,
The AISC Connections Manual, or probably any steel or connections text will
produce numerous examples of fillet welds utilized the way you describe.

Don't you just hate it when someone brings up something so stupid you
actually have to pause to think about it? :-)  By his reasoning half the
buildings in the US should not be standing.


Paul Feather





----- Original Message -----
From: "Oshin Tosounian" <sdgse(--nospam--at)pacbell.net>
To: <seaint(--nospam--at)seaint.org>
Sent: Monday, October 15, 2001 6:04 PM
Subject: Re: Fillet Welds


> Roger Turk wrote:
>
> > For your cantilever example, I would design the weld using the shear on
> the
> > effective area, determined using the section property of a weld treated
as
> a
> > line.
>
> Roger,
>
> That's how I have been designing my welds. This came up as a plan review
> comment from the SER of a building we are designing the cladding support.
We
> detailed the support as a short beam cantilevering off of the building
> column (like a corble) with 3/16" fillet weld all around. The SER
commented
> on the detail saying "AISC has no tensile value for this type of weld".
Now,
> I am assuming he is refering to the top weld being in tension, due to the
> bending moment, normal to the effective area, which, for fillet weld, is
not
> listed in AISC. Is the SER correct. I have always designed this condition
> with the weld sized for the resultant stress on the weld due to bending
and
> direct shear. I haven't talked to the SER yet, and wanted to have some
> feedback from the list to make sure I was not missing somthing.
>
> Thanks for your input.
>
> Oshin Tosounian, S.E.
> Los Angeles, CA
>
>
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