Reparability Limit of Steel Structural Buildings Based on the Actual Data of the Hyogoken-Nanbu Earthquake by

For the development of performance-based design taking into consideration economic losses after earthquakes, reparability limits should be clarified in order to avoid demolishing. In this paper, the reparability limits of steel structural buildings were investigated based on the actual data of repaired or demolished buildings which were damaged by Hyogoken-nanbu earthquake both from technical and economic points of view. The investigation provided the following results on the reparability limit: 1) overall residual drift angle was 1/110; 2) maximum residual inter-story drift angle was 1/71; 3) direct restoration cost ratio was 0.86; 4) indirect restoration cost ratio was 0.40. Furthermore, based on the actual data, the relationship of residual drift angle and restoration cost ratio was investigated and the reparability limits synthesizing technical and economic aspects were defined by overall residual drift angle and maximum residual inter-story drift angle as 1/200 and 1/90, respectively.