System identification of a five-story building using seismic strong-motion data

Rodrigo Astroza, Francisco Hernández, Pablo Díaz, Gonzalo Gutierrez

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

1 Scopus citations

Abstract

A full scale five-story reinforced concrete building was built and tested on the Large High Performance Outdoor Shake Table (LHPOST) at the University of California, San Diego in 2012. The main objective of the test program was to study the seismic response of the structure and the nonstructural components (NSCs) and their dynamic interaction at different levels of seismic excitation. The building specimen was first tested base-isolated and then fixed at its base. In the fixed-base configuration, a suite of six earthquake motions of various intensities was applied to the building to progressively increase the seismic demand. In this paper, the modal parameters of the fixed-base building are identified using the input-output dynamic data recorded during the seismic tests. The deterministic-stochastic subspace identification method (DSI) is employed to estimate the variations of the modal properties of the building during the seismic tests by employing a short-time windowing approach. The changes of the modal parameters during the seismic motions are tracked, analyzed, and compared to those previously obtained from ambient vibrations and low-amplitude white noise base excitation tests. The identified natural frequencies and equivalent damping ratios of the building changed with the intensity of the input motions and damage in the structure, while the mode shapes are found to be insensitive to them.

Original languageEnglish
Title of host publicationDynamics of Civil Structures, Volume 2 - Proceedings of the 37th IMAC, A Conference and Exposition on Structural Dynamics, 2019
EditorsShamim Pakzad
PublisherSpringer New York LLC
Pages181-189
Number of pages9
ISBN (Print)9783030121143
DOIs
StatePublished - 2020
Event37th IMAC, A Conference and Exposition on Structural Dynamics, 2019 - Orlando, United States
Duration: 28 Jan 201931 Jan 2019

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652

Conference

Conference37th IMAC, A Conference and Exposition on Structural Dynamics, 2019
Country/TerritoryUnited States
CityOrlando
Period28/01/1931/01/19

Bibliographical note

Funding Information:
Acknowledgements The authors are very grateful to Professors Tara C. Hutchinson, Joel P. Conte, and José I. Restrepo from the University of California, San Diego for making these data available (DOI: 10.4231/D38W38349). R. Astroza acknowledges the financial support from the Chilean National Commission for Scientific and Technological Research (CONICYT), through FONDECYT research grant No. 11160009.

Funding Information:
The authors are very grateful to Professors Tara C. Hutchinson, Joel P. Conte, and José I. Restrepo from the University of California, San Diego for making these data available (DOI: 10.4231/D38W38349). R. Astroza acknowledges the financial support from the Chilean National Commission for Scientific and Technological Research (CONICYT), through FONDECYT research grant No. 11160009.

Publisher Copyright:
© Society for Experimental Mechanics, Inc. 2020.

Keywords

  • Damage
  • Modal properties
  • Shake table
  • System identification

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