Hello,
This is likely to be a very basic question but as most structural engineers know, AISC calculates the effective length of frames in section C7.2 utilizing stiffness ratios (G). My question is this: why are the stiffness ratios calculated using the beam/girder's moment of inertia about their strong axis? Both the column and the beam are in compression so they would buckle about their weak axis prior to buckling about their strong axis which makes me think I'm missing something simple that I'm not thinking of.
Thanks for any help in advance!
This is likely to be a very basic question but as most structural engineers know, AISC calculates the effective length of frames in section C7.2 utilizing stiffness ratios (G). My question is this: why are the stiffness ratios calculated using the beam/girder's moment of inertia about their strong axis? Both the column and the beam are in compression so they would buckle about their weak axis prior to buckling about their strong axis which makes me think I'm missing something simple that I'm not thinking of.
Thanks for any help in advance!
