A Review on Local Buckling Behavior of Concrete-Filled Steel Tubes Considering Diameter-to-Thickness Ratio and Stiffeners

Abstract

This paper outlines the systematic review carried out with regards to the structural response and the strengthening action of Concrete-Filled Steel Tubular (CFST) columns with various methods of stiffening. This review performs a critical synthesis of 25 recent experimental studies with regards to the effects of five major parameters: stiffener configuration, diameter-to-thickness ratio (D/t) slenderness ratio (L/t) material properties of steel and concrete (fy, fcu) and the geometry of the column. From this research, it can be noted that different types of stiffening, such as longitudinal ribs, internal lining tubes, and reinforcing bars, assist in minimizing the chances of local buckling and also help improve the bonding between the steel tube and concrete. Additionally, it has been noted that stiffeners play an important role in thin-walled columns because they increase the ductility and load-carrying capacity.