Seismic design of inelastic structures using equivalent linear system parameters: Part 1 - derivation and comparison

Metin Oguzmert, Eric M Lui

Research output: Contribution to journalArticle

1 Scopus citations


This article, which is the first of a two-part article, presents equations for computing equivalent linear system (ELS) parameters using a two-dimensional minimisation technique for estimating inelastic seismic demand of structures from elastic response spectra. Using two hysteretic models, the effects of initial damping, post-yield stiffness and degrading behaviour on the ELS parameters are investigated. The maximum inelastic response of structures modelled as single degree-of-freedom systems computed using the proposed method are compared with five other approximate methods as well as with results obtained using inelastic time-history analysis. It is observed that the proposed approach gives good results for structures that experience ductile behaviour with natural periods in the 0.3- to 3-s range.

Original languageEnglish (US)
Pages (from-to)89-102
Number of pages14
JournalIES Journal Part A: Civil and Structural Engineering
Issue number2
StatePublished - May 2011



  • Earthquake engineering
  • Equivalent linear parameters
  • Inelastic structures
  • SDOF systems
  • Seismic design

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Computational Mechanics
  • Mechanical Engineering

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