ABSTRACT
SUMMARY
The mode of failure of portal frames composed of cold-formed members generally involves inelastic local buckling. A method of analysis based on the finite strip method is presented for calculating the inelastic local buckling loads of thin-walled sections.
A method of matrix displacement analysis of thin-walled structures is presented which accounts for non-uniform torsion, monosymmetric and asymmetric thin-walled sections, eccentric restraints and joints peculiar to thin-walled structures. The analysis is applied to a study of pitched roof portal frames composed of channel- and Z-section members and subjected to vertical load. The stresses and deformations of structures of this type are described.
Simple design methods for Z- and channel-section portals based on plane frame linear elastic analyses are described.
