Abstract
Concrete-filled steel tubular (CFST) columns with various profiles are increasingly applied. Nevertheless, current design codes mainly focus on circle or square/rectangle profiles, and there lacks accurate and reliable design method for other profiles. Motivated by the research gap, this study developed a mechanism-based unified design formula suitable for CFST columns with various profiles. This study was based on a theoretical analysis of circle profiles, through which the relationship between confining stress and cross-section geometric/material parameters was established. The non-circle profiles were converted into equivalent circle profiles in this study, and the effects of corner radius and aspect ratio on equivalent confining stress were investigated based on the discussion of effectively and ineffectively confined areas. The loads shared by concrete and steel tubes due to variations in confining stress were analytically evaluated. Thus a mechanism-based unified design formula was established. The formula was validated using a database of 258 specimens from 21 independent studies. The average ratio of the predicted to experimental load-bearing capacity was 0.979. Additionally, the proposed model showed a similar accuracy for square/rectangular sections and other profiles. The inconsistency in the prediction results for different profiles according to Eurocode 4 or ACI 318–19 was addressed.
Published Version
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