How to check a weld for applied moment?
How to check a weld for applied moment?
(OP)
I have a single angle connected to a double angle via a 3/16" weld

I know there is a factored, applied moment at that connection. I would like to ask how I can go about checking the capacity of this connection for moment? There is a lot of stuff in AISC for welds in Chapter J, partially and fully restrained moment connections but I am not sure where to start. What chapter/section of AISC codifies this kind of problem?

I know there is a factored, applied moment at that connection. I would like to ask how I can go about checking the capacity of this connection for moment? There is a lot of stuff in AISC for welds in Chapter J, partially and fully restrained moment connections but I am not sure where to start. What chapter/section of AISC codifies this kind of problem?






RE: How to check a weld for applied moment?
Also look at AISC's steel manual - (page 8-9 in the 14th Edition) where they talk about eccentrically loaded weld groups.
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RE: How to check a weld for applied moment?
1) Figure out the shear on the weld assuming that it's uniform (k/in).
2) Figure out the tension and compression stresses that generate the resisting moment at the connection (k/in).
3) Take the vector sum of #1 and #2 (shear + tension) and design the welds for that.
4) If it were me, multiply the answer by 1.25 to compensate for the difficulty inherent in determining the bending stresses accurately.
It's really #2 that will cause you problems in a situation like this. The supporting angle isn't likely to provide a very rigid support so figuring out the tension stresses will be a bit of a crap shoot.
Is your detail a drag strut tying into a steel joist? If so, that isn't a connection where your average engineer would worry about them moments in the weld.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: How to check a weld for applied moment?
RE: How to check a weld for applied moment?
RE: How to check a weld for applied moment?
For determining the moment capacity of a weld group, in the past I have taken the section modulus of the line of weld (in^2, mm^2) and used that to determine a linear load on the weld (k/in, kN/mm).
RE: How to check a weld for applied moment?
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