<p>Over the past few decades, research on concrete filled double skin tubular (CFDST) columns have gained significant momentum in an effort to capitalize on both the confinement effect and increased stiffness. The behaviour of CFDST columns under axially compressive loads is examined in this study. The investigated CFDST columns consist of outer circular tube made of Ductile iron, inner circular tube made of Unplasticized Polyvinyl Chloride and concrete filled between the two tubes. Eight specimens with varying parameters which include thickness of outer tube, diameter of inner tube, thickness of inner tube, hollow ratio and slenderness ratio, were cast and tested. The results indicate a favourable response for CFDST specimens, especially in terms of axial strength and ductility. The influence of the varied parameters on the axial load carrying capacity of the column specimens were examined. A comparison between theoretical values obtained from modified design equations in various codebooks and those proposed by different researchers with experimental results revealed that, among the modified equations obtained from codebooks, the Indian and European codes demonstrated good alignment with the experimental data, each exhibiting an average deviation of 21%. And among the researcher-derived equations, the formula proposed by Hassanein and Kharoob yielded the most precise estimation of the ultimate axial capacity of double skin columns, with an average variation of just 1%.</p>