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RE: Steel gusset plate design

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Title: RE: Steel gusset plate design

If you look at LRFD Volume II page 11-29, the Whitmore section is illustrated in Figure 11-11b. Essentially, the Whitmore width is determined by spreading the force out of the connection at it's start 30 degrees to each side. When you get to the end of the connection, the Whitmore width is the width to which it has spread. Multiply the width by the thickness and you have the area. To determine the appropriate critical buckling stress for use with that area, see the discussion under "Comments" on page 11-42.

A more simple illustration of the 30-degree spread for a Whitmore section is shown on page11-15 for a tee hanger connection.

Hope this helps.

Charlie