Steel Column to Beam Connection 1

[mjohan]

Should there be a different type of connection for a column base plate to a W shaped top flange; when the beam is in positive moment, when the beam is in negative moment?

I would like to use a steel base plate with 3/4" bolts connecting to the top flange. I am concerned with:

1) The reduction in area of top flange while the beam is in negative moment.

2) If eliminating the bolts, would welding the base plate to the top flange result in an undesirable connection while the beam is in negative moment?

I appreciate any help on this subject.

 

[dlew]

mjohan,

AISC allows to use the gross area of the section if
0.5 Fu Anet >= 0.6 Fy Agross.
That applies to both, the tension and compression flanges.

To weld the base plate to the beam is also acceptable. The welding should be done correctly, of course, to reduce the stresses that the heating and cooling of the welds could introduce.

Regards

 

[dlew]

mjohan,

I forgot to include the pertinent paragraphs from the AISC - ASD: B2, B3 and B10

 

[mjohan]

Thanks for the post.

Mark

 

[ronster]

Just curious, how do you have top and bottom flange on a column?