 Lateraltorsional buckling of the unsupported length of the beam/member before the crosssection develops the plastic moment Mp.
 Local buckling of the individual plates (flanges and webs) of the crosssection before they develop the compressive yield stress Fy.
Design of Steel Beam:The development of a plastic stress distribution over the crosssection can be hindered by two different length effects: Lateral Torsional Buckling

 Beams are generally proportioned such that moment of inertia about the major principal axis is considerably larger than that of minor axis.
 This is done to make
As result they are weak in resistance to TORSION and BENDING about the Minor axis
If bending about Yaxis is not prevented by bracing, the beam will undergo LateralTorsionalBuckling before the bending moment capacity of the beam is achieved.
Lateral
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