Design for distortional buckling of flexural members

摘要

For thin-walled flexural members composed of high-strength steel and/ or slender elements in the section, mode of buckling at half-wavelengths intermediate between local buckling and flexural-torsional or flexural buckling can occur. The mode is most common for edge-stiffened sections such as C- and Z-purlins, and involves rotation of the flange and lip about the flange-web junction. The mode is commonly called distortional buck- ling. This paper presents a design method for distortional buckling of flex- ural members recently drafted for use in the Australian/New Zealand standard for Cod-formed Steel Structures.