  In this paper, a new finite element (FE) model using ABAQUS software was
developed to investigate the compressive behavior of Concrete-Filled Steel
Circular-Tube (CFSCT) columns. Experimental studies indicated that the
confinement offered by the circular steel tube in a CFSCT column increased both
the strength and ductility of the filled concrete. Base on the database of 663
test results CFSCT columns under axial compression are collected from the
available literature, a formula to determine the lateral confining pressures on
concrete. Concrete-Damaged Plasticity Model (CDPM) and parameters are available
in ABAQUS are used in the analysis. From results analysis, a proposed formula
for predicting ultimate load by determining intensification and diminution for
concrete and steel. The proposed formula is then compared with the FE model,
the previous study, and the design code current in strength prediction of CFSCT
columns under compression. The comparative result shows that the FE model, the
proposed formula is more stable and accurate than the previous study and
current standards when using material normal or high strength.
