Finite element study to address the axial capacity of the circular concrete-filled steel tubular stub columns

This paper presents finite element analysis using the software ABAQUS to the circular CFST stub columns. The produced FE model is verified by comparing results of the FE simulation, failure load, and load-axial strain curves, to the experimental results. Then a parametric study has been done to examine the effect of the steel tube yield strength and size. A method is then proposed to calculate the confined concrete compressive strength. The proposed model was verified against 382 previously tested data. It has been found that both the FE and the numerical model are in excellent agreement with the experimental data. The numerical model proposed in this paper compared to the models proposed by leading design codes and previously proposed models by other researchers. It has been found that the current model predicts the ultimate capacity of these columns with excellent accuracy while the compared-with numerical models were generally providing conservative predictions.