In this paper, post-earthquake fire modeling was studied in steel structures with different levels of ground motion intensity. Three-story structure modeling was implemented under post-earthquake fire by using the OpenSees software. The performance of the structure was investigated under different levels of ground motion intensity to the level of life safety. The structure was subjected to seismic and thermal analysis by applying standard fire load up to 880 seconds of fire. The 9-point thermal gradient for beam and column profiles under heat was analyzed by heat transfer analysis in the software. By comparing obtained results from the seismic analysis and post-earthquake fire analysis, it can be seen that for different levels of ground motion intensity, the behavior of the structure is different when it is exposed to post-earthquake fire than being exposed to the earthquake alone, which can affect the performance-based design of the structure. Therefore, in the design of structures, the effect of post-earthquake fire should be taken into account, considering the seismic zone of the structure and the time required to extinguish the fire.
