This study numerically analysis the behavior of reinforced concrete (RC) columns subjected to high temperatures through transient state analysis, focusing on the impact of loading at various Y/H ratios. The mechanical and thermal reactions of RC columns under combined thermal and structural loads are modeled using a finite element analysis technique. The study investigates the effects of varying loading locations (Y/H ratios) on the deformation properties, load-carrying capacity, and structural stability at high temperatures. And the ratios are 0.46, 0.04, 0.86, 0.41, 0.8, 0.5, 0.31, and 0.67. Important characteristics are included to guarantee the correctness of the numerical model, such as material deterioration, specific heat, and thermal conductivity. The results show that the Y/H ratio significantly affects the failure mechanisms and patterns of stress distribution. Thermal gradients and load eccentricities play a crucial role in determining the structural efficiency of RC columns during fire events. The critical temperature for transient state analysis is reached at Immediate Occupancy (IO) and Life Safety (LS) in 69 min at 314 °C and 163 min at 647 °C, respectively, when the entire column is heated. The immediate occupancy (IO) was 12.25 mm and Life Safety (LS) was 47.34 mm was obtained as axial deformation with Y/H = 0, a = 3500 mm.