Steel Column Base Plate: Placement of Anchor Bolts 1

[srazahz]

Hello

I am working on a base plate for HSS steel column and facing an issue with the placement of anchor bolts.
Apparently the column will be placed on the edge of the foundation wall due to which the base plate can not be extended on that edge and the column cannot be moved.
The foundation wall is not wide enough to allow anchor bolts on either side of the column.
So the only option is to provide anchor bolts on only one side of the column.

I am a bit skeptical about using this method because it seems that any moments or uplift forces will make the connection unstable.

I would really appreciate some feedback on this issue.

Thanks!

 

[jayrod12]

Perhaps a sketch showing the edge of concrete and the HSS placement will allow people to comment better.

 

[srazahz]

Perhaps a sketch showing the edge of concrete and the HSS placement will allow people to comment better.

I hope this is an acceptable representation of what I am trying to convey.

 

[jayrod12]

Yes that helps.

Will this column actually see uplift or shear? or is it strictly a gravity column?

 

[srazahz]

Yes that helps. Will this column actually see uplift or shear? or is it strictly a gravity column?

Yes, this column will be taking uplift and shear.

 

[JoshPlumSE]

Can you use and embed plate with some nelson studs to avoid the edge issues? Or maybe some nelson D2L's directly welded to the embed plate. Then field weld the column to the plate?

 

[Ron247]

Will the bolts be cast in or drilled?

 

[JAE]

Your sketch isn't very good for uplift. I'd suggest what JoshPlum suggests - embed plates.

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[canwesteng]

Connection is certainly stable as shown, but there are prying effects on the bolts increasing load quite a bit. I'd second Joshplum, weld some studs or rebar to the underside and weld the post to the plate.

 

[KootK]

For many brace configurations, there will not be axial load coming in through the column. Think one story braces with chevron or tension only bracing. In those cases, the simplification below may be attractive. The fact that you're dropping this column on a 10" foundation wall suggests that this is probably a light duty commercial/residential application rather than a 50 story building column. But you tell me.

 

[JStephen]

Leave a handhole in the column and put the anchor bolts inside the column?
"Thinking inside the box!"

 

[KootK]

This is, of course, to trade shop effort against field convenience.

 

[srazahz]

This is, of course, to trade shop effort against field convenience.

This might just do the trick since the foundation has already been poured and nelson studs are of no use anymore.

Thank you!

By the way, you were correct about the size of the structure. It is a 6-story residential building.

 

[KootK]

You're most welcome srazahz, happy to help.

 

[Yao1989]

Hmm I really like the creativity in the connection. Really outside the box.

 

[jayrod12]

Outside the box is Kootk territory...

 

[Toby43]

Maybe have vertical fin added to the baseplate that does down the outside edge of the footing/wall with bolts fixed to face of wall in addition to bolts shown.

 

[KootK]

Thanks for the kind words gentlemen. Namaste.

It does kind of beg the question: why not just use a WF column? I assume that the OP has his reasons.

 

[Veer007]

Why don't you use 2-12mm Ø hilti has rod with epoxy anchor where you can't able to provide anchor rod? You may get 25mm as edge distance

 

[MotorCity]

Can you provide a vertical "baseplate" on any of the sides of the foundation wall and create a saddle of sorts?