TY - GEN
T1 - Statistical analysis of the identified modal properties of a 5-story RC seismically damaged building specimen
AU - Astroza, Rodrigo
AU - Ebrahimian, H.
AU - Conte, J. P.
AU - Restrepo, J. I.
AU - Hutchinson, T. C.
N1 - © 2013 Taylor & Francis Group, London.
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
KW - Ambient measurement
KW - Ambient vibrations
KW - Environmental conditions
KW - Modal parameters
KW - Operational modal analysis
KW - State-of-the-art methods
KW - Statistical variability
KW - Vibration-based damage detection
UR - http://www.scopus.com/inward/record.url?scp=84892427457&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84892427457
SN - 9781138000865
T3 - Safety, Reliability, Risk and Life-Cycle Performance of Structures and Infrastructures - Proceedings of the 11th International Conference on Structural Safety and Reliability, ICOSSAR 2013
SP - 4593
EP - 4600
BT - Safety, Reliability, Risk and Life-Cycle Performance of Structures and Infrastructures - Proceedings of the 11th International Conference on Structural Safety and Reliability, ICOSSAR 2013
T2 - 11th International Conference on Structural Safety and Reliability, ICOSSAR 2013
Y2 - 16 June 2013 through 20 June 2013
ER -