Abstract: “The use of Concrete Filled Steel Tube columns becomes increasingly popular in the structural engineering field due to the advantages such as high bearing capacity, ductility and economic efficiency. Many experimental and numerical studies have been undertaken to investigate the behaviour of normal aggregate concrete filled steel tube NACFST columns under quasi static loads. However, few research has been conducted to study the behaviour of the recycled aggregate concrete filled steel tube RACFST columns under compression loading particularly the eccentric loading. This paper reports the findings of the experimental and numerical study investigating the behaviour of the NACFST and RACFST columns subjected to axial concentric and eccentric loading. Eighteen structural circular hollow tubes with a length of 458 mm and an outer diameter (D) of 114.3 mm were tested; half of them were filled with recycled aggregate concrete while the others were filled with normal aggregate concrete. The stu”

Keywords: compression behavior; concrete-filled steel columns; recycled aggregate; finite element simulation