In this paper

the residual load bearing capacity of reinforced concrete-filled circle steel tube（RCFST）short columns after fire under axial pressure was studied.Six RCFST short columns were tested by heating following the ISO-834 standard fire condition including cooling phase loading to failure after cooling to room temperature.The temperature field model of RCFST short column under heating condition was built by ABAQUS

and the comparison shows that the theoretical analysis results are in good agreement with the former test results.Based on that

the parametric analysis of residual load bearing capacity of post-fire of RCFST short column under axial pressure was studied.The study reveals that the RCFST short columns still have high bearing capacity in post-fire.Heating up time and sectional dimension of the column are the main parameters influencing the fire resistance of RCFST columns.Based on these parameters

simplified calculation formulas of the residual load bearing capacity after fire were put forward

and calculated results by the formulas showed well agreement with theoretical model results.The achievements may give a reference to the repair and reinforcement of practical engineering where RCFST short columns are used.