Comparison of the predictability of the ultimate axial strength of elliptical CFST columns using existing square and circular section-based code formulae

The elliptical hollow section has been recently included in the family of structural steel sections. This type is also used production concrete-filled tubular (CFST) members. For CFST compression members, there no specific design formulation current provisions, except code called “Technical for structures” prepared by Ministry Housing and Urban-Rural Development People’s Republic China. However, formula proposed this estimating ultimate strength columns was achieved modifying predicting square In context, objective study to evaluate applicability existing formulae that were axially loaded with rectangular or circular sections an section. To this, a data repository consisting 97 experimentally tested compiled. Herein, main criterion selection axial loading condition. Thereafter, prediction performance these assessed terms statistical parameters. results indicated circular-sectioned have better capability than suggested Among section, recommended American Institute Steel Construction, British Standard Institute, Canadian Standards Association, Eurocode 4 performed best capability. These had lowest mean absolute percent error values R-squared higher 0.8.