Displacement spectra and displacement modification factors, based on records from Greece

C. J. Athanassiadou, C. Z. Karakostas, B. N. Margaris, A. J. Kappos

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Elastic and inelastic displacement spectra (for periods up to 4.0. s) are derived, using a representative sample of acceleration records from Greece, carefully selected based on magnitude, distance and peak ground acceleration criteria, and grouped into three ground type categories according to the Eurocode 8 (EC8) provisions. The modification factor for the elastic design spectrum adopted in EC8 for accounting for damping is verified herein and is found to be satisfactory in the short to medium period range and less so in the long period range. The equivalent viscous damping ratio concept is also evaluated and is found to lead to underestimation of inelastic displacement spectra. Finally, based on the previously derived elastic and inelastic spectra, equations suitable for design and/or assessment purposes, are proposed for the corresponding displacement modification factors.

Original languageBritish English
Pages (from-to)1640-1653
Number of pages14
JournalSoil Dynamics and Earthquake Engineering
Issue number12
StatePublished - Dec 2011


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