SCI P358 - UK "Green book" (on connections). Longitudinal and transverse welds

[Taras.D]

Hello everyone.
Maybe my question seems strange to someone, still I'm confused.
The UK "Green book" on connections has table G.37 (Weld strengths) which has two columns - longitudinal loading and transverse loading, the difference between these values is 1.225. I can't actually find this in the Eurocode itself, but here's a prinscreen from the lecture presented by Mr. David Brown (SCI) who says, that we might increase the bearing resistance of the weld by this value when it is a "transverse weld".
Eurocode, on other hand insists, that shear strength of the weld doesn't depend on the direction of the force.
Here're some pics.
Printscreen from the lecture I mentioned:

The Green Book table:

Eurocode clause:

Someone, please, clarify my confusion

 

[Bowsers]

I don't have my steel book handy, but there is an increase present in the AISC for the directionality of the fillet weld. IIRC the increase is up to 1.5x.

 

[Taras.D]

Browsers, thank you.
At least now I know, that there's something similar in American practice.
Still, how can that be? Does that mean, that a fillet weld will break along one of its legs rather than along the shortest "throat line"?
I never thought, that this is possible, at least when weld metal has equal strength to that of the parent metal...

But, probably, if we consider formula 4.1 in EN 1993-1-8, there are different stress components in it, so the strength of the weld might depend on the stress state.
Still the simplified method given in 4.5.3.3 doesn't give us this option.

 

[HS_PA_PE]

Look for the paper "Strength of Fillet Welds as a Function of Direction of Load" by L.J. Butler and G.J. Kulak. It describes some of the experimentation that underpins the AISC treatment of fillet weld directional strength increase. As a caution, the increased strength is accompanied by a decrease in deformability.