System identification of a full-scale five-story reinforced concrete building tested on the NEES-UCSD shake table

Rodrigo Astroza, Hamed Ebrahimian, Joel P. Conte, Jose I. Restrepo, Tara C. Hutchinson

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

Abstract

This paper presents the identification of the modal properties of a full-scale 5-story reinforced concrete (R/C) building outfitted with a variety of nonstructural components and systems (NCSs) tested on the unidirectional NEES-UCSD shake table in April-May, 2012. The building specimen was tested under base-isolated (BI) and fixed-base (FB) configurations. The purpose of the test program was to study the seismic response of the structure and NCSs and their dynamic interaction at different levels of seismic excitation. For each base configuration (BI and FB), the building was subjected to a sequence of earthquake base motions carefully selected so as to progressively increase the seismic demand on the structure and NCSs. Before and after each seismic test, ambient vibration (AV) data were recorded, and additionally, low amplitude white noise (WN) base excitation tests were conducted at key stages during the test protocol. Because of the low intensity of the ambient and WN base excitations, a quasi-linear response of the system is assumed, and the modal parameters of an equivalent linear time-invariant (LTI) model are estimated. Using the structural vibration data recorded by 28 accelerometers, three system identification methods, including two output-only (SSI-DATA and NExT-ERA) and one input-output (DSI), are used to estimate the modal properties of the BI and FB building between seismic tests. The results show that the modal properties obtained by different methods are in good agreement and that the estimated modal parameters of the building are affected by the amplitude of the excitation, environmental conditions, and structural/nonstructural damage in the structure.

Original languageEnglish
Title of host publicationProceedings of the 9th International Conference on Structural Dynamics, EURODYN 2014
EditorsA. Cunha, P. Ribeiro, E. Caetano, G. Muller
PublisherEuropean Association for Structural Dynamics
Pages2333-2340
Number of pages8
ISBN (Electronic)9789727521654
StatePublished - 2014
Event9th International Conference on Structural Dynamics, EURODYN 2014 - Porto, Portugal
Duration: 30 Jun 20142 Jul 2014

Publication series

NameProceedings of the International Conference on Structural Dynamic , EURODYN
Volume2014-January
ISSN (Print)2311-9020

Conference

Conference9th International Conference on Structural Dynamics, EURODYN 2014
Country/TerritoryPortugal
CityPorto
Period30/06/142/07/14

Bibliographical note

Funding Information:
This project was a collaboration between four academic institutions: The University of California at San Diego, San Diego State University, Howard University, and Worcester Polytechnic Institute, four major funding sources: The National Science Foundation (grant number CMMI-0936505), the Englekirk Advisory Board, the Charles Pankow Foundation, and the California Seismic Safety Commission, over 40 industry partners, and two oversight committees. Support of graduate students Consuelo Aranda, Michelle Chen, Elias Espino, Steve Mintz (deceased), Elide Pantoli, and Xiang Wang, the NEES@UCSD and NEES@UCLA staff, and contributions of Robert Bachman, Dr. Robert Englekirk and Mahmoud Faghihi are greatly appreciated. Opinions and findings in this study are those of the authors and do not necessarily reflect the views of the sponsors.

Keywords

  • Base isolation
  • Damage
  • Full-scale specimen
  • Nonstructural components
  • Shake table
  • System identification

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