An extension of the Generalised Beam Theory (GBT) is employed to investigate the buckling behaviour of thin-walled lipped channel FRP columns, beams and beam-columns, fabricated by pultrusion and displaying a special kind of orthotropy. The GBT equations are used to identify the relevant (local and global) buckling modes and determine the corresponding bifurcation stress values. The influence of loading, material and geometrical parameters on the member buckling behaviour is assessed by means of a number of parametric studies. Special attention is paid to aspects related to the occurrence of local plate, distortional and flexural-distortional buckling modes.
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