A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Estimation of Structural Modal Parameters under Winds Using a Virtual Dynamic Shaker
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.
Estimation of Structural Modal Parameters under Winds Using a Virtual Dynamic Shaker
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.
Estimation of Structural Modal Parameters under Winds Using a Virtual Dynamic Shaker
Hwang, Jae-Seung (author) / Kwon, Dae-Kun (author) / Kareem, Ahsan (author)
2018-01-19
Article (Journal)
Electronic Resource
Unknown
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