Which one of the following is NOT a difference between the behaviour of the beam-columns subject to the bending moment about minor axis to major axis ?
1
In the case of slender members under small axial load, there is very little reduction of moment capacity below Mp, since lateral torsional buckling is not a problem in weak axis bending
2
The moment of magnification is larger in the case of beamcolumns bending about their weak axis
3
As the slenderness decreases, the failure curves in the P/P,,, y-y axis plane change from convex to concave, showing decreasing dominance of minor axis bucking
4
The failure of short/stocky members is either due to section strength being reached at the ends or at the section of larger magnified moment