Estimation of Structural Modal Parameters under Winds Using a Virtual Dynamic Shaker
Publication: Journal of Engineering Mechanics
Volume 144, Issue 4
Abstract
A new output-only system identification (SI) scheme composed of a virtual dynamic shaker (VDS) is proposed. The concept of the VDS is analogous to a secondary system such as a tuned mass damper (TMD), but it is a virtual device that is attached virtually to a primary structure. The SI technique is based on the dynamics of the combined primary structure and the VDS for the estimation of structural modal parameters. The dynamic response of the VDS is amplified around the natural frequency of the primary structure and depends on the level of damping ratio of the VDS. In this manner, the natural frequency of the primary structure can be determined as it represents the frequency at which the variance of the VDS response reaches its maximum. The structural damping ratio can be identified through the derived ratio of the response variances of VDSs attached individually to the primary structure with different damping ratios. The proposed VDS scheme is validated in detail through extensive examples of building structures under wind loads using numerical simulations and full-scale records obtained through full-scale measurements, with emphasis on the damping estimation. In addition, a comparison with other popular output-only SI schemes is made to examine the efficacy of the proposed VDS-based scheme. On the basis of the extensive examples used in this study, the damping estimates by the VDS are overall accurate, comparable with those by other popular schemes, which corroborates the efficacy of the proposed VDS as an easy-to-use approach for the output-only SI.
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Acknowledgments
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2017R1D1A1B03031265) and in part by the US NSF Grant # CMMI-1562244. This research was also supported by a grant (15CTAP-C097490-01) from the Technology Advancement Research Program funded by the Ministry of Land, Infrastructure and Transport Affairs of the Korean government.
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Published In
Journal of Engineering Mechanics
Volume 144 • Issue 4 • April 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jun 19, 2017
Accepted: Sep 15, 2017
Published online: Jan 19, 2018
Published in print: Apr 1, 2018
Discussion open until: Jun 19, 2018
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