CAN/CSA S16-01 Steel Beam-Column Design

[qu4a]

When designing a beam-column to CAN/CSA S16-01, non-uniform moment are taken into account in two places:
When calculating Mu, omega 2 accounts for the non-uniform moments as a function of the moments at the ends of the (laterally) unbraced length.
When calculating the combined axial force and bending moment effects, omega 1 accounts for the non-uniform moments as function of the moments at the ends of the member.
Am I correct in saying that these two omega values are essentially different although they account for the same thing - the ends of a member and the unbraced ends may not necessarily be the same thing? Please could someone shed some more light on this topic for me. Thanks.

 

[dik]

They are two different values representing similar conditions.

w1(omega1) = 0.6 - 0.4(M1/M2) but is >= 0.4 where M1 is the smaller end moment

w2 = 1.75 + 1.05(M1/M2) + 0.3 (M1/M2)^2 <= 2.5 and is equal to 1.0 for a moment within the span.

Dik