Identification of instantaneous modal parameters of a nonlinear building via a Gabor-frame-based approach

Wei Chih Su, Chiung-Shiann Huang, Ho Cheng Lien

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This work presents the use of a Gabor transform to determine the instantaneous modal parameters (natural frequencies, damping ratios and mode shapes) of a structure from its dynamical responses, such as free vibration or earthquake response. The Gabor transform is applied to the measured acceleration responses of a structural system for reconstructing the time-varying time series model in time-frequency domain. The instantaneous modal parameters of a time-varying system can be directly estimated from the time-varying model coefficients. The proposed procedure is further applied to process the dynamic responses of three-storey steel frames with or without nonlinear elements from the simulated earthquake events via SAP2000 to identify the differences among the frames. The linear or nonlinear behaviors of these steel frames under earthquake input are accurately reflected in the instantaneous natural frequencies that are obtained by the proposed approach.

Original languageEnglish
Title of host publication2016 International Conference on Applied System Innovation, IEEE ICASI 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781467398886
DOIs
StatePublished - 10 Aug 2016
Event2016 International Conference on Applied System Innovation, IEEE ICASI 2016 - Ginowan City Okinawa, Japan
Duration: 28 May 20161 Jun 2016

Publication series

Name2016 International Conference on Applied System Innovation, IEEE ICASI 2016

Conference

Conference2016 International Conference on Applied System Innovation, IEEE ICASI 2016
CountryJapan
CityGinowan City Okinawa
Period28/05/161/06/16

Keywords

  • Gabor transform
  • instantaneous modal parameters
  • time-varying series model

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