Lateral torsional buckling (LTB) of a steel beam occurs when:
Choose the correct answer
The beam section is fully compact
The compression flange buckles laterally while the tension flange provides restraint
The web buckles due to excessive shear
The beam is overloaded axially
Correct Answer
B. The compression flange buckles laterally while the tension flange provides restraint
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LTB is a failure mode for laterally unbraced beams under bending. The compression flange (like a column) buckles laterally while the tension flange restrains it, causing the beam to twist. Susceptibility depends on unbraced length and section geometry.
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