Bottom Flange Connection

[EIT2]

What are your opinions on underhung, or bottom flange connections?

Is it acceptable to support a beam by a column that is supported or hung from the bottom flange of a beam above?

Thank you!

 

[sframe]

If I understand correctly, you are hanging something on the bottom flange of a beam. Make sure you check the flange local bending and web local yielding of the supporting beam --- in addition to the overall capacity.

 

[JAE]

This would be chapter K of the AISC specification. With hanger-type structures, add an additional factor for impact or hanger loading as it is not redundant.

 

[Lutfi]

Yes it is acceptable if I understand you correctly. I would not call i t a column tho, I would call it a hanger. Also when you have connections like that, pay close attention to the prying action of the hanger connection on both ends.

By the way, I have designed an entire mezzanine without any column because the client wanted a clear open floor free of columns. I had to suspend the entire mezzanine floor from the rood structure above.

Good luck.