W-Beam to Wood Column connection

[Vrpps EIT]

Hi, can anyone recommend how to attach a W steel beam to a 3#-(2x6) studs?, so that the beam is somewhat restrained at the connection and prevents the rotation of beam, though the beam is designed as a pinned connection still not sure whether it can just be rested on top of the 3#-(2x6) studs.

Thank you!

 

[SlideRuleEra]

Do the math, assume the beam does have a fixed connection to the triple 2x6 wood column - calculate the moment at the end of the beam. That moment does not "vanish", it is applied to the column. What will that moment do to the column? ... make the wood column deflect? ... or even break the wood column?

Instead of trying to make a fixed connection, suggest doing what it takes to make sure the connection is pinned... so that the wood column is not subjected to that moment.

http://www.SlideRuleEra.net

 

[JAE]

You'd have to put the steel beam on top as I wouldn't trust the long term performance of some type of bolted shear connection to wood.

You could fabricate a type of column cap assembly, similar to what Simpson Strong-Tie does or simply use an upside down "U" shaped assembly to create a cap plate over the wood to allow either bolting or welding of the beam to the steel plate.



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[JAE]

...and I agree with SlideRuleEra on not trying to put a lot of moment in the wood column.

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[dhengr]

Veerapps:
There should be two or three bearing studs (jack studs, shoulder studs…) under the beam, and they should be cut to length carefully so more than one of them is (all of them are) bearing the primary reaction load. Then, there should also be a full height (king stud) beyond the end of the stl. bm. Then, you should do something to tie the stl. bm. in torsionally too, and brace it laterally so that it can not roll over or move laterally.

 

[msquared48]

I would not use multiple studs under the steel beam, but a solid 4x or 6x column instead with steel tab plates and two thru bolts. I would also add full height studs to each sidpe, nailed off to solid blocking between the flangess.

Personal preference on the solid stick...

Mike McCann, PE, SE (WA)

 

[MER3]

When you say "prevent rotation" are you saying prevent actual rotation due to moment (and thus make the joint have some moment carrying capacity) or are you trying to provide restraint against lateral torsional buckling at the ends?

 

[Ron247]

I am little confused about "somewhat restrained" and then "prevents rotation". You say the beam is pin-connected. If you connect it to restrain rotation, then it is not pin-connected. You designed it pin, then make it take significant moment is not a good idea. As SlideRule said, check it fixed to see what happens. A true pin is very hard to actually create. A true fixed connection can be created more reliably. If you model it pinned and you reasonably make a pin-connection, rarely do you have a problem with the small amount of fixity that is present.

 

[jayrod12]

And if you are talking about restraining it from LTB at the ends, perhaps draw a section at the bearing condition indicating how the joists frame into the beam, where the sheathing is etc. and we'll be able to help tailor the detail.

Generally for myself, when I'm specifying a steel beam in wood design it's because headroom is an issue to have an appropriately sized wood beam. Therefore my beam is typically flush framed with a wood nailer on the top flange and top flange hangers for the joists. This allows the floor/roof sheathing to be mounted directly to the wood nailer which restrains the top chord adequately and will provide some form of connection from the bottom flange to the column.

As others above have indicated, it would be prudent to stop the steel beam 1 1/2" short from the outside face of stud to allow you to have a king stud run up past the beam. This king stud provides the lateral stability to the jack studs below.

 

[TroyD]

See attached sketch for a few connection options I had conceptualized a while back. Pros and cons to each option.