I am building some steel tube structures and it is clear that one of the joints needs a gusset. This will lap over the tube effectively increasing the wall thickness in an area, rather creating any sort of extra triangulation. When thinking about the additional strength that the gusset will add to that location, is this basically an additive process where a gusset of X cross section and Y yield strength with increase the yield strength of the new joint by X*Y?
Basically, I am considering using material for the gusset which has a lower yield strength than the main structure's material, and am wondering if this is actually more of a complicated interaction than it seems.
Thanks in advance for the advice and insight!
If you examine bending stress formulas you will see an expression for the moment of the section, (usually inches to the fourth power or equivalent). The geometry of your gusset will influence this value and so the stiffness of the structure. The stiffness of your structure probably won't be the same in the X,Y & Z directions so in answer to your question, it is more complicated than multiplication.
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