LATERAL-TORSIONAL BUCKLING OF MONOSYMMETRIC I-BEAMS WITH NON-COMPACT SECTION

Abstract

This paper presents test results on lateral-torsional buckling of welded monosymmetric I-beams with various flange plate sizes. Ten different sections including doubly symmetric ones are tested under a concentrated load for a simply supported span. Four span lengths ranging from 1.5m to 3.75m are chosen for each of the sections. The effects of overall and flange local buckling on the rotation capacity and the ultimate strength are investigated for the beams with noncompact section. Test results are also compared with design stregnth curves which are evaluated by the Q-factor method and other approaches.