In this paper, aiming to examine how fireproof coatings influence the post-fire behavior of steel sections under axial compressive loading, the residual strength of hollow steel columns with fireproof coatings after exposure to high temperatures and cooling was assessed through experimental and numerical studies. For this research, samples were selected from hollow steel sections coated with mineral cement and gypsum-based fireproof coatings. Initially, the furnace was brought to temperatures of 400, 600, 800, and 1000 degrees Celsius, and then the samples were placed in the electric furnace at the desired temperatures for one hour. After the samples were cooled to room temperature over 24 hours, a tensile test was conducted to obtain the mechanical properties of the steel, and a compressive load-bearing test was performed to evaluate the residual compressive strength of the samples. The results of the fireproof-coated samples were compared with those of the uncoated samples. Next, a numerical model was developed using the finite element software ABAQUS, which can be used to perform parametric studies. The results of the numerical model were compared with the results of the experiments and verified. The findings regarding the residual strength of the sections showed that the use of fireproof coatings increased the residual strength of the sections at 800 and 1000 degrees Celsius by approximately 30 to 34 percent compared to the uncoated samples at the same temperature.