The present paper discuses on a dynamic seismic performance index of structure, d Is, and a dynamic ductility index, d F, of a brace installed in the longitudinal direction of school sport halls. Based on the result of the elasto-plasitc dynamic analysis depending on various input levels, d F and d Is are re-studied. As numerical parameters, a yield base shear coefficient of braces of substructure, Cy , and a capacity limit deformation of braces as well as hysteresis types are considered, and their effects on d F and d Is are investigated.
