Steel Column

[hello12345hello]

I am trying to design steel column. As shown on attachment beam is 4in away from column. And beam has torsional loading. To check column do i have to include Mx moment and My moment both. what eccentricity i have to include for My moment.

 

[msquared48]

I would consider cutting the tube column and cantilevering the other beam over the column to pick up the other beam. This connection would not transfer any moment or toresion to the column.

Definitely torsional loading here on the column otherwse.

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[hello12345hello]

if i will consider torsion loading i will add additional moment
Mx from connection eccentricity = Beam reaction times distance between column center and connection ..
Also additional moment My (torsion moment = beam reaction times 8" which is distance between column center and load.)
so there will be biaxial moment and i will check column for that.

 

[hokie66]

Agree with Mike that cantilevering an orthogonal beam will take out the column bending. I don't see that the column is in torsion anyway, just bending.

 

[hello12345hello]

I agree but column is continuous so i can not continue orthogonal beam to pick up the other beam.

 

[msquared48]

So then this is an existing, loaded column?

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[ishvaaag]

Anyway, if a concept issue is the matter, intervening members are no other thing than means to pass loads to support. Hence following your sketch, taking what would be the vertical reaction of an ordinary beam placed at 8 inches from the axis of the column would give a similar answer to placing the same reaction at 4 inches ... plus the torsion moment. So, e = 8 inches for the vertical reaction of the beam in a simplified way, just vector mechanics.

Other than that, follow analysis.

 

[hokie66]

ishvaaag has it. Beam reaction x 8". That's the moment applied to the column about that axis. No moment about the other axis.

 

[hello12345hello]

thank you