ELASTIC FLEXURAL-TORSIONAL BUCKLING ANALYSIS OF DOUBLY-SYMMETRICAL WEB-TAPERED I-BEAMS

In structural steel design, flexural-torsional buckling (FTB) is an important limit state that must be considered, especially in thin-walled members. A thin-walled beam loaded in its plane of symmetry bends in-plane of loading, however, it may fail because of the flexural-torsional buckling, where the beam suddenly deflects and twists out of the loading plane. This type of failure occurs suddenly in members with a much greater in-plane bending...