Inelastic Seismic Response Assessment of Short Period Structures Subjected to High-Frequency Earthquakes

Much attention has been paid to describe inelastic seismic response of structures realistically. Because inelastic energy absorption factor is a function of ductility demand(μ) and period(T) of the structure, it is expected that frequency component of an earthquake can affect the result. If inelastic energy absorption factor(Fμ) is affected by the frequency component of an earthquake, site-specific soil condition or frequency component of the earthquake of interest should be considered in the calculation of the factor. In this study, several real recorded earthquakes are divided into two groups depending on the frequency component of the earthquakes. Short-period structure subjected to high-frequency earthquakes showed generally larger inelastic energy absorption factor(Fμ) than that of lower-frequency earthquakes. This result yields the need for the consideration of site-specific soil condition or frequency component of the earthquake of interest in evaluating seismic capacity of NPP structures.