Recently, there are many discussions about repairability and recovery for damaged buildings after severe disasters, and new keywords such as “Resilience” and “Redundancy” have been closed-up. This paper investigates the repairability of damaged steel building structures which experienced severe disasters such as earthquake input motions. At first, the analytical model for repaired steel member is explained, and also its applicability is represented by comparison with past test results. The next, the ultimate states of steel framed model of original state and repairing state under seismic loads are calculated by limit analysis. Herein, an analytical frame model is designed that the whole story collapse mode is predominated in original state. And also, to adjust the failure mode of frame after repair, a various strategy of repairing portion in frame is assumed. From the analytical results, it is observed that the strength and energy absorption are enhanced if the adequate repairing strategy is adopted to generate the whole collapse failure mode. That is, it can be said that these repaired frame has high repairability and resilience.
