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Biaxial Moment Frame Column

Biaxial Moment Frame Column

Biaxial Moment Frame Column

(OP)
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

RE: Biaxial Moment Frame Column

I wasn't aware that you couldn't.

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

RE: Biaxial Moment Frame Column

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

Not sure though as I am not an SE.

 

RE: Biaxial Moment Frame Column

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)?

 

RE: Biaxial Moment Frame Column

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?

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