Lateral‐torsional buckling experiments of built‐up section CFS beams

Abstract This paper investigates the lateral‐torsional buckling of built‐up cold‐formed steel beams featuring two or three component C‐ sigma‐sections arranged to have a closed loop. Several thicknesses each cross‐section with nominal yield stress values 450 MPa and 550 were tested obtain lateral strength data for range slenderness values. Complementary reference tests conducted on same sections braced laterally in‐plane section capacities, precluding effect buckling. Coupon also determine mechanical properties material. The test rig featured dual‐actuator set‐up, one actuator (applying vertical load) mounted trolley that was moved horizontally by second in response signal from transducer measuring displacement at mid‐length beam, thus ensuring loading throughout experiments. specialized end bearings allowing free flexural rotations warping, while restraining displacements twist rotations. describes results Particular attention is paid use parts enhance torsional rigidity thereby their capacity.