Composite member - welding on only one side of web
Composite member - welding on only one side of web
(OP)
Suppose you have a composite member (built up T, but it could a W section or any similar built up section), what is the consequence of welding on only one side of the web to resist shear flow between the flange and the web? I'm thinking either a) nothing happens b) there is flexure in the weld and it breaks c) there is some weak axis bending in the section.






RE: Composite member - welding on only one side of web
RE: Composite member - welding on only one side of web
1) In general, it's fine and there are no consequences.
2) The PEMB guys do this all the time apparently so there's plenty of precedent.
3) Thomas Murray of vibration design guide fame once wrote a letter defending this practice. I have it... somewhere.
4) You can't do this at the ends of special moment frame beams in high seismic areas of the US which, no doubt, is of no relevance at all to whatever you're tinkering with.
5) When there are problems, they seem to be related to cyclic load at high levels of flexural strain.
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: Composite member - welding on only one side of web
Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries
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RE: Composite member - welding on only one side of web
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: Composite member - welding on only one side of web
RE: Composite member - welding on only one side of web
Here's at least one thread that touches this topic: http://www.eng-tips.com/viewthread.cfm?qid=424184
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RE: Composite member - welding on only one side of web
RE: Composite member - welding on only one side of web
If we are talking a compression load (via a external axial force).....weld will be needed along the full length, not just at the ends. The pieces will try to separate as the axial load gets higher.
For analytical treatment on this (and some useful formulas) see:
'Analytical Criteria for Stich Strength of Built-Up Compression Members', by: Aslani & Goel, 3rd Quarter (1992), AISC Journal
That's why I said what I said before: it's one thing if this is just for flexural/shear.....but a whole other ballgame if the member is subjected to other forces.
RE: Composite member - welding on only one side of web
I hope this helps.....
RE: Composite member - welding on only one side of web