Risks for long-period structures due to long-period strong motion has been a challenge since damages occurred during 2003 Tokachi-oki Earthquake. Although PML is widely used as a seismic performance index, conventional methods cannot be applied directly to those. A new PML evaluation method is proposed. Ground motions for inter- and intra-plate, and crustal earthquakes are predicted using attenuation equations of response spectrum and group delay time. 3D elasto-plastic response analyses are employed and earthquake loss is calculated based on ductility and cumulative plastic deformation ratio of each structural element. The proposed method is illustrated with examples in Osaka and Tokyo.
