Site-dependent design spectra and strength modification factors, based on records from Greece

Abstract Elastic and inelastic spectra are derived, based on a representative sample of acceleration records from Greece, carefully selected based on magnitude, distance and peak ground acceleration criteria, and grouped into three ground condition categories according to the 2004 Eurocode 8 (EC8) provisions. Using software developed in-house, elastic (pseudoacceleration, pseudovelocity and displacement), as well as inelastic (strength and displacement) spectra are computed for various critical damping ratios and ductility levels. After appropriate scaling, mean spectra are computed both irrespective of, as well as for each different, ground condition, and comparisons with EC8 provisions are made. As a further evaluation of the code spectra, three additional earthquake scenarios are considered representing ground-motion characteristics not reflected in the compiled dataset of records. Subsequently, modification factors for strength ( q μ ) are derived from statistical analysis of constant ductility spectra, and corresponding empirical relationships, suitable for design purposes, are proposed.

[1]  Peter Fajfar,et al.  Consistent inelastic design spectra: Strength and displacement , 1994 .

[2]  Mjn Priestley,et al.  Performance based seismic design , 2000 .

[3]  Andreas J. Kappos.  Dynamic Loading and Design of Structures , 2001 .

[4]  M. Fardis,et al.  Designer's guide to EN 1998-1 and en 1998-5 Eurocode 8: Design of structures for earthquake resistance; general rules, seismic actions, design rules for buildings, foundations and retaining structures/ M.Fardis[et al.] , 2005 .

[5]  Andreas J. Kappos,et al.  A re-evaluation of scaling techniques for natural records , 2000 .

[6]  Julian J. Bommer,et al.  Inelastic spectra for displacement based seismic design , 2001 .

[7]  Hung-Chie Chiu,et al.  Stable baseline correction of digital strong-motion data , 1997, Bulletin of the Seismological Society of America.

[8]  B. S. Papazachos.  Large seismic faults in the Hellenic arc , 1996 .

[9]  Vitelmo V. Bertero,et al.  Evaluation of Strength Reduction Factors for Earthquake-Resistant Design , 1994 .

[10]  N. Theodulidis,et al.  Elastic And Inelastic Spectra For GreekEarthquakes, Based On A RepresentativeSet Of Records , 2005 .

[11]  Andreas J. Kappos,et al.  Evaluation of behaviour factors on the basis of ductility and overstrength studies , 1999 .

[12]  W. J. Hall,et al.  Scaling Methods for Earthquake Response Spectra , 1984 .

[13]  Pierre-Yves Bard,et al.  EUROCODE 8 DESIGN RESPONSE SPECTRA EVALUATION USING THE K-NET JAPANESE DATABASE , 2005 .

[14]  Julian J. Bommer,et al.  Derivation of design soil coefficients (S) and response spectral shapes for Eurocode 8 using the European Strong-Motion Database , 2002 .

[15]  E. Miranda.  INELASTIC DISPLACEMENT RATIOS FOR STRUCTURES ON FIRM SITES , 2000 .

[16]  B. N. Margaris,et al.  Determination of noise spectra from strong motion data recorded in Greece , 2003 .