Quenton Wattinger

The program is coming up with the tensile flange force. In your case: Moment: 150 kft * 12 = 1,800 k-in / 10 " (distance btw flanges) = 180 kips tension/compression per flange due to moment Axial: 300 k * flange area/total area = 300 k * 37% = 111…

AISC 360 says that the full area (of the top, smaller column) is in bearing, so we prorate the flange force based on that. Note, it's actually less conservative the way you wrote above; 180 -150 is only 30 kips