Peak ductility demand of mainshock-aftershock sequences for Japanese earthquakes

K Goda

Research output: Contribution to conferenceConference Paperpeer-review


A large mainshock triggers numerous aftershocks. Large aftershocks can cause additional damage and disruption to buildings and infrastructure in a post-disaster situation. This study investigates the effects of aftershocks on peak ductility demand of elastic-perfectly-plastic single-degree-of-freedom systems using real as well as artificial mainshock-aftershock sequences. First, empirical assessment of the incremental peak nonlinear response due to aftershocks is conducted by using real mainshock-aftershock sequences constructed from the K-NET and KiK-net databases for Japanese earthquakes. Subsequently, an alternative method of generating artificial time-history data of mainshock-aftershock sequences is implemented based on the generalized Omori’s law and suitable record selection criteria for aftershocks. Analysis results indicate that overall increase of the peak ductility demand ranges from 5% to 20%, depending on the vibration period of a structural system and seismic excitation level, and that peak ductility demands for real and artificial sequences are similar and thus artificial sequences can be substituted for real sequences.
Translated title of the contributionPeak ductility demand of mainshock-aftershock sequences for Japanese earthquakes
Original languageEnglish
Number of pages10
Publication statusPublished - Sep 2012

Bibliographical note

Name and Venue of Event: Lisbon, Portugal


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