Abstract
The aim of the study is to predict the axial anchorage capacity of the concrete-filled steel box (CFSB) as footing by using the 3D finite element program CAMUI developed by authors' laboratory. The steel box is filled with concrete, and concrete-filled steel tube column is inserted in the box. Numerical simulation of the experimental specimens was carried out after introducing the new constitutive model for post-peak behavior of concrete in compression under confinement. The experimental program, consisting of two specimens, was conducted to verify the reliability of the simulation results by the FE program. The simulated peak loads agree reasonably with the experimental ones, and the axial anchorage capacity is controlled by the compression softening of the concrete under the column. It was also observed that the axial capacity of CFSB footing is affected by concrete depth under the column. The axial capacity decreases with the decrease in concrete depth under the column.