Dual scaling vs. amplitude scaling in time-history analysis

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Abstract

In order to estimate the inelastic seismic response of structures modern design codes, such as the ASCE/SEI7 or the Eurocode, allow the use of a family of scaled natural accelerograms to define the seismic input. In view of this, a number of selection and scaling criteria have been proposed over the years. When it comes to scaling, the traditional approach has been to think in terms of scaling the amplitude of the accelerograms to match the intensity of the seismic input with that associated with the design spectrum. Less attention has been devoted to dual scaling (i.e. a combination of time and amplitude scaling). When it comes to the intensity to match, it is now clear that the matching of spectral acceleration does not appear to be the one and only best option for all possible combinations of the fundamental seismic parameters of the structure under analysis, i.e. fundamental period and inelastic strength.
This work presents a comparative study where ductility demands of inelastic structures (idealized as SDOF systems) are estimated by time-history analysis using families of natural accelerograms scaled by different criteria. The first type of scaling criteria deals with amplitude scaling guided by either spectral acceleration or spectrum intensity; therefore no modification of the frequency content of the seismic input is imposed. The second type of scaling criteria deals with dual scaling with the view of minimizing the geometrical differences between the response and the design spectra with the option of accounting for the period and inelastic strength of the structure under analysis. It is concluded that dual scaling offers an interesting and yet simple approach to make an effective and more flexible use of natural accelerograms in engineering practice.
Original languageEnglish
Title of host publicationProceedings of the Tenth U.S. National Conference on Earthquake Engineering
Subtitle of host publicationFrontiers of Earthquake Engineering
PublisherEarthquake Engineering Research Institute
Pages1-10
Number of pages10
DOIs
Publication statusPublished - 21 Jul 2014
EventTenth U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering - Alaska, Anchorage, United States
Duration: 21 Jul 201425 Jul 2014

Conference

ConferenceTenth U.S. National Conference on Earthquake Engineering
Abbreviated title10NCEE
CountryUnited States
CityAnchorage
Period21/07/1425/07/14

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Keywords

  • seismic scaling
  • amplitude scaling
  • time scaling
  • nonlinear analysis
  • earthquake ground motion
  • seismic design
  • Eurocode 8

Cite this

Martinez-Rueda, J., & Hamedi, F. (2014). Dual scaling vs. amplitude scaling in time-history analysis. In Proceedings of the Tenth U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering (pp. 1-10). [001130] Earthquake Engineering Research Institute. https://doi.org/10.4231/D34X54H3D