Flexural behavior of circular concrete filled steel tubes (CFST) under sustained load and chloride corrosion

• Experimental study on circular CFST under long-term bending and chloride corrosion.
• Full-range analysis of circular CFST under long-term bending and chloride corrosion.
• Simplified model for ultimate flexural strength of corroded circular CFST.

This paper studies the flexural behavior of circular concrete filled steel tubes (CFST) under sustained load and chloride corrosion. 7 CFST specimens were tested under a four-point bending load. It was found that corrosion causes noticeable deterioration to the flexural strength, while the ductility of CFST keeps well. A finite element analysis (FEA) model was developed to study the full-range behavior of CFST under corrosion. A parametric study was conducted to find the main parameters that influence the residual flexural strength, based on which a simplified model was proposed to calculate the residual flexural strength of circular CFST under long-term load and corrosion.