Abstract
Eurocode 4 about composite structures proposes a simplified method to design concrete-filled tube sections subjected to combined compression and bi-axial bending, as an alternative to the general one. This method is based on determining the validity of a section by comparing the acting forces with the interaction curve N–M. In order to take slenderness into account, a reduction factor χ is defined, leading to a reduction of the compression and bending strength. This text proposes a new approach based on the simplified method mentioned above, thought to provide designers a faster and simpler checking and designing method for this typology of sections, including also buckling effects. With this purpose, a polynomial function is proposed depending on five known parameters: χ, χd, χpm,r and μmax, for which a new formulation is presented.
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