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Re: Whitmore Section

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Thanks Charlie for the information  especially for the modification to the
effective length factor.  I wouldn't have gotten that and I'm pretty close
on my design.

Joseph R. Grill, PE


----- Original Message -----
From: "Carter, Charlie" <carter(--nospam--at)aisc.org>
To: <seaint(--nospam--at)seaint.org>
Sent: Tuesday, December 24, 2002 3:22 AM
Subject: RE: Whitmore Section


> >Page 7-114 of the AISC Connections Manual shows
> >a sketch for an example using the "Whitmore" section.
> >Consider a connection with the brace connecting to a
> >beam only (the column is gone).  I see the dimensions
> >Lw, l2, and l1 remaining the same.  The dimension l3
> >will increase in length from the corner of the
> >section until a line parallel to the brace intersects
> >the beam flange.  Then per the last paragraph on the
> >previous page the column length would be the
> >average of l3 and l1 (l2 is negative in this case).
> >Would this be correct?
>
> The geometry of the buckling lengthe l1, l2 and l3 as you describe them
> sound reasonable. You can use a negative value in determining the average
> for the buckling check. It makes sense, because that means the gusset is
> very stiff there -- the beam flange is restraining buckling.
>
> Note also, however, the modification in the effective length factor for
the
> case of a gusset supported on one edge. We recommend 1.2 instead of the
0.5
> used when both edges of the gusset are connected.
>
> Charlie
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