Statistical analysis of the identified modal properties of a 5-story RC seismically damaged building specimen

Rodrigo Astroza, H. Ebrahimian, J. P. Conte, J. I. Restrepo, T. C. Hutchinson

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

4 Scopus citations

Abstract

The application of vibration-based damage detection using ambient measurements requires an accurate and reliable estimation of the modal parameters. This study presents a comprehensive statistical analysis of the identified modal properties of a full scale five-story reinforced concrete building - built and tested on the NEES-UCSD shake table - using recorded ambient vibration data. The building specimen was tested under base-isolated and fixed-base conditions. On April 6, 2012, when the building was isolated at its base, a dense accelerometer array was deployed on the structure and ambient vibration data were collected continuously until May 18, 2012, three days after the last seismic test in the fixed-base configuration. A state-of-the-art method of operational modal analysis was used to automatically identify, from the recorded ambient vibration data, the modal properties of the fixed-base building, including natural frequencies, damping ratios and mode shapes. A statistical analysis of the identified modal parameters is performed to investigate the statistical variability and accuracy of the system identification results. The variability of the identified modal parameters due to environmental conditions is also investigated.

Original languageEnglish
Title of host publicationSafety, Reliability, Risk and Life-Cycle Performance of Structures and Infrastructures - Proceedings of the 11th International Conference on Structural Safety and Reliability, ICOSSAR 2013
Pages4593-4600
Number of pages8
StatePublished - 2013
Event11th International Conference on Structural Safety and Reliability, ICOSSAR 2013 - New York, NY, United States
Duration: 16 Jun 201320 Jun 2013

Publication series

NameSafety, Reliability, Risk and Life-Cycle Performance of Structures and Infrastructures - Proceedings of the 11th International Conference on Structural Safety and Reliability, ICOSSAR 2013

Conference

Conference11th International Conference on Structural Safety and Reliability, ICOSSAR 2013
Country/TerritoryUnited States
CityNew York, NY
Period16/06/1320/06/13

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