Abstract
School gymnasiums are often used as shelter for the neighbors after great earthquakes. For that, fall or damage of outer cladding due to large deformation of the structure must be avoided. In the present study, steel braced frames in longitudinal direction of four real school gymnasiums where the seismic retrofit has been completed are adopted as the structural models. 3D inelastic response analysis is conducted to investigate the correlation between the response story drift or ductility demand of the braces and the seismic performance index Is. Moreover, applicability of the limit strength calculation using simple mass-spring model is verified.
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