| Abstract: | Lateral‐torsional buckling of crane runway beams built‐up by rolled profiles combined with angle sections on the top flange. Crane runway beams of overhead travelling cranes are subjected to biaxial bending and torsion due to the crane operation with the wheel loads ane the eccentric horizontal loads. The crane runway girders are proned for lateral‐torsional buckling due to this loading situation. Therefore the verification for lateral‐torsional buckling is often dimensioning for the design of crane runway beams for overhead travelling cranes. In the case of the application of rolled sections, the required lateral stiffness of the top flange is often not sufficient even for light crane operations and medium span lengths. In order to increase the lateral stiffness on the top flanges of these crane runway beams, the rolled sections can be strengthened by welding angle profiles on both sides of the top flange. This type of construction is a widespreaded application for crane runway beams especitally for medium and heavy crane operations. However, the assessment method for lateral‐torsional buckling is for this type of crane runway beam more difficult because of the simple symmetrical cross‐section togehter with the the loading situation with biaxial bending and torsion. Within the scope of this article, the different possibilities for the assessment methods of lateral‐torsinal buckling are shown for crane runway beams built‐up by rolled profiles combined with angle sections on the top flange and are compared on the basis of a example calculation. In addition the results of a comprehensive parameter study [1] on the effectiveness of the different assessment methods are summarized. |
