Special and intermediate moment resisting frames are two main types of lateral load resisting systems used in high-seismic regions, depending on the height of the building. Current design codes consider only earthquake risks in the design of these structures and neglect subsequent hazards. The current study compares the multi-hazard robustness of these alternative designs for earthquake and subsequent fire. For this purpose, two special and intermediate four-bay four-story steel moment frames were designed and subjected to different earthquake intensities and fire scenarios. Three types of failures, including local failure (failure of beams), partial failure (failure in some elements but not the entire structure), and global failure (overall instability of the structure), were encountered in the analyzed models. It was observed that the intermediate frame had higher fire resistance against one-bay fire scenarios than the special frame. On the contrary, when the fire was considered in an entire story, the fire resistance of both models decreased considerably with increasing earthquake intensity.
