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I want to make a shop welded splice

I want to make a shop welded splice

I want to make a shop welded splice

(OP)
I want to make a shop welded splice joint at column flange and web. Splices in the material in the flanges and web shall not be coincidental i.e. located at the same horizontal position thru the section.
what is the minimum and maximum offset distance should be between web and flange joint line.

RE: I want to make a shop welded splice

Where are you getting the offset requirement from? Field splices are made all the time with no offset of this kind.

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: I want to make a shop welded splice

(OP)
requirement is for shop weld. not field weld

RE: I want to make a shop welded splice

I realize that. So where does the requirement come from? What standard? What clause? I'm asking because I'm frankly skeptical that such a requirement actually exists.

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: I want to make a shop welded splice

(OP)
It's a client requirement, and we didn't take any clarification/deviation against this...So now we have to show.

RE: I want to make a shop welded splice

Then you'll have to ask your client what offset they'd like to see. In my opinion, it's a terrible requirement. It will add lots of cost and probably result in a weaker connection.

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: I want to make a shop welded splice

whether or not it is a field weld or a shop weld is irrelevant to your question
This sounds like something specific to your project that came from the structural engineer and not prescriptively required by Code. Or perhaps it could be just a note used to encourage the bidding contractor to submit long members. I've inspected thousands of column splices and haven't seen an offset like you describe. Ask the structural engineer to clarify. then post an update... we're curious.

RE: I want to make a shop welded splice

you 2 type fast. i thought my comment would be 4th... it seems a little out of place

RE: I want to make a shop welded splice

No big deal if you are working with a 3-Plate section. For a hot-rolled W shape the concept of an offset feels pretty stupid since it requires doing more than just getting a square surface for the weld to occur at.

RE: I want to make a shop welded splice

Jayantabh:
Ajh1 has it right, imagine having to clean up the flg./web/k area of each column section, and the change in direction of cutting btwn. and across the flg., then up the web some length, then across the web, etc. All of these direction changes offer the potential for introducing notches, reentrant corners, poor welds, changes in direction of welds, with three welds meeting at a point, triaxial residual stresses from welding, etc. etc. They lead to an inferior finished product, not an improved product. The fact is that if the column doesn’t have much moment in it, a square, clean cut or milled end bearing is about all you need, and any flg. welds take care of small moments, and I believe the AISC manual says as much.

Take what you have heard and learned here, back to your client and make a case for the fact that what they want probably introduces more chances for poor welds and poor/difficult weld prep. The fact of the matter is that their requirement probably has no basis in fact or need. There once was some thinking that you didn’t want to splice every piece of material at the same cross section, but that just doesn’t make sense any longer.

RE: I want to make a shop welded splice

maybe they want a scabbed on splice rather than a direct welded splice? (i.e. a plate on either side of the web and then maybe a cover plate on the outsides of each flange) That would be a connection where the splice isn't really in line with the member web or flange.

I have no idea why they'd write it that way, though. Basically, I can't believe anyone would be specifying what it sounds like they're specifying, so I'm hoping there's a misunderstanding.

RE: I want to make a shop welded splice

I'm putting my money on ajh1's three plate section theory. That's the only context in which I can see it making any sense.

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.

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