Abstract
An analytical study of optimal fibre direction for improving the lateral buckling strength of thin-walled composite open-section members is presented. Based on a Vlasov-type linear hypothesis, beam stiffness coefficients, which account for cross-section geometry and for the material anisotropy of the section as well as the geometrical characteristics of columns, are obtained. Uniformly distributed load, transverse concentrated load, unequal end moments, tip-loaded cantilever and columns with different types of loading, are considered. The results show that, in some cases, the web fibre angle makes a remarkable contribution to increasing the buckling load compared with the unidirectional orientation of the pultrusion process.
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