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RE: single plate shear connections

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Thanks Charlie
You are such a wealth of knowledge.  I really
appreciate your insights.
--- Charlie Carter <carter(--nospam--at)> wrote:
> >there is a lot of
> >concern over whether or not you can weld a single
> >shear plate to an HSS face or not but there doesn't
> >seem to be the same concern when this type of plate
> is
> >being welded to a wide flange column web.
> The condition is similar, but the concern is more
> often expressed with HSS
> for two reasons:
> 1. A single plate is not a very buildable detail
> into the column web unless
> you change it so that it really isn't a single plate
> any more. Huh? What I
> mean is, a true singleplate witha 3 in. distance
> from the weld to the bolt
> line will often be well inside the flanges of the
> column if that connection
> were made to a column web. So it's hard to get in
> there to install the
> bolts, especially if they are specified as anything
> other than
> snug-tightened. You won't be able to get any kind of
> powered installation
> equipment in there to do it. Even worse, how do you
> get the beam in in the
> first place? You'd have to tip the column, which is
> a big OSHA erection
> no-no.
> 	When a single-plate-type detail is used into the
> column web, it most
> often built out with top and bottom plates so that
> the actual single-plate
> part of it extends out past the tips of the column
> flanges. But once you do
> that (and pay to do it too!), you don't have the
> same support concern
> anymore as would apply to a thin HSS wall.
> 2. If you do decide to use a single plate despite
> the concerns above (I'd
> think long and hard about it first), the range of
> wall thicknesses for HSS
> is generally limited to 5/8 in. or less (1/2 in. or
> less in many cases) with
> common wall thicknesses in the 1/4, 5/16 and 3/8
> range. Column webs can be
> and often are thicker. The support concerns for
> single plate connections are
> not a problem once you get into thicker supporting
> element thicknesses.
> Also, there is usually a lot more stiffness in the
> column web due to the
> thicker flanges of W14's and the like than the
> "flanges" of HSS columns,
> which are of the same thickness as the face to which
> the connection is made.
> Charlie

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