Biaxial Moment Frame Column

[FourStar]

Can anyone tell me why I can't use an HSS column at the intersection of two orthogonal OMFs? If so, is there a provision in the IBC, ASCE7, or AISC341 you are refering to?

Thanks

 

[frv]

I wasn't aware that you couldn't.

In fact, if memory serves me right, I've actually used one.

 

[csd72]

I think its a matter of there not being any approved connections available.

Not sure though as I am not an SE.

 

[JKStruct]

I would try to avoid it. Make sure you think about the moment connection to the tube column (i.e. the push-pull forces from the flanges of the beam on the wall of the tube). Is it possible to use a wide flange column oriented in the more critical direction and "dog leg" the orthogonal frame into the shared column (pin connection)?

 

[dougantholz]

It is expensive, but can be done. Make both beams the same depth and same elevation. Use a common through plate at bottom and top. If you are stuck with an R>3, I don't think you can use it unless there is some testing to show its rotational flexibility.
I assume there is not a single other column you could move the moment frame - I mean its not like your blocking a doorway with a brace, right?