Compressive behaviour of double skin sections with stainless steel outer tubes and recycled aggregate concrete

An experimental and numerical study into the behaviour of concrete-filled double skin tubular (CFDST) stub columns is presented. A total eight axial compression tests were carried out, four utilising conventional concrete with recycled aggregate concrete. The circular in cross-section each comprised an austenitic stainless steel outer tube a carbon inner tube, varying dimensions. Accordingly, hollow ratios 0.67 0.55 considered. coarse was made by crushing test specimens from previous research project, replacement ratio 50% adopted. During experiments, similar structural failure modes observed between To investigate further, finite element model developed ABAQUS; validation against results current work as well data available literature described. employed to conduct parametric examine load-bearing contributions constituent components CFDST sections assess influence on behaviour. ultimate loads are compared capacity predictions determined using design procedures. Overall, show that can achieve capacities their counterparts, demonstrating potential for wider use concrete, towards more sustainable solutions.