Maximum inelastic displacement of mainshock-damaged structures under succeeding aftershock

Duofa Ji, Weiping Wen*, Changhai Zhai, Evangelos I. Katsanos

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review


    To facilitate the rapid, though, reliable assessment of mainshock-damaged structures against the succeeding aftershock excitations, the γ-index is introduced, defined as the ratio of the residual displacement of a structure under the mainshock excitation over the aftershock-induced maximum inelastic displacement of the damaged structure. Over 200 mainshock-aftershock sequences from very dense and stiff soil profiles were chosen to perform nonlinear response history analyses of single degree of freedom systems and the influence of structural, strong ground motion and site-specific parameters on the γ-index was assessed. An equation for the γ-index is proposed to predict the performance of the damaged structure under aftershocks.
    Original languageEnglish
    Article number106248
    JournalSoil Dynamics and Earthquake Engineering
    Number of pages6
    Publication statusPublished - 2020


    • Earthquake sequences
    • Single degree of freedom systems
    • Lateral strength ratio
    • Residual displacement
    • Maximum inelastic displacement


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