Consider the following statements regarding the lateral torsional buckling of symmetric sections :
1. The beam has no initial imperfections and its behavior is elastic.
2. It is loaded by unequal and opposite end moments in the plane of the web.
3. The beam have residual stresses and its ends are simply supported vertically and laterally.
Which of the above statements is/are correct ?
1
2 and 3
2
3 only
3
1 and 2
4
1 only