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Free Edge Buckling of a Gusset Plate

Free Edge Buckling of a Gusset Plate

Free Edge Buckling of a Gusset Plate

(OP)
I was wondering if anyone has any good references or design examples for checking or stiffening the free edge of a gusset plate for buckling?

RE: Free Edge Buckling of a Gusset Plate

It does cost $20.

One approach I've used in the past for triangular gussets is to treat strips of the gusset as columns and calculate allowable compressive strength of each strip.  Then sum total allowable load or moment of the gusset.  Don't know how that compares to the referenced document.

RE: Free Edge Buckling of a Gusset Plate

yep i usually resolve the forces and treat treat the gusset as a compression strut with effecive lenght 0.7L when its welded both sides top and bottom

RE: Free Edge Buckling of a Gusset Plate

(OP)
Does this hold true for a gusset welded accross the top to the bottom flange of a steel beam. I have a K brace condition where two braces come into the gusset (compression and tension. Is the free edge of the gusset between the brace points considered slender? How is the free edge stiffened without having to increase the plate thickness?  

RE: Free Edge Buckling of a Gusset Plate

I assume that you are talking about a chevron (inverted V) not a K brace.

I have used 2 approaches for stiffening the free edge:

Add a stiffening angle on the lower edge of the gusset
or
Use a  single vertical stiffeners from the top flange of the beam down to the bottom of the gusset to cut the length of the free edge in half.

RE: Free Edge Buckling of a Gusset Plate

Steve, look on page 14 of the PDF file.  The first two images in Figure 2.7 show the edge stiffener.  You add this stiffener, which reduces your free edge buckling length.  For these cases, the length to check for would be from the end of the stiffener to the corner of the gusset.  If your plate still doesn't check out, you might be looking at a thicker plate.

Note that the edge stiffener can't continue across your hinge line, if you're detailing for seismic.

The AISC seismic design manual has some information on this as well.

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