Simplified Nonlinear Damping Force Formula for Rotary Eddy Current Dampers and Comparative Hazard Analysis under Seismic Excitation with Fluid Viscous Dampers
Publication: Journal of Structural Engineering
Volume 150, Issue 4
Abstract
Ensuring the robust performance of damping devices during intense vibrations, such as seismic excitation, is crucial for maintaining structural protection. Hazard analysis serves as an effective method for evaluating the reliability of vibration-damping devices installed on structures subjected to vibrations. This study aimed to conduct a seismic hazard analysis comparing the rotary eddy current damper (R-ECD) and the widely used fluid viscous damper (FVD). To facilitate analysis and engineering applications, this study introduces innovative contributions by proposing a simplified formula for estimating the nonlinear damping force of the R-ECD under specific conditions. This formula incorporates two physically significant parameters: maximum damping force () and critical velocity (). By doing so, it offers a swift and efficient tool for the intricate calculation of damping force. The accuracy of this estimation formula is validated by testing a large-scale R-ECD with a maximum damping force exceeding 1,500 kN, revealing a remarkable agreement of between the estimated and experimental results. Subsequently, employing stochastic linearization, the equivalent linear damping ratio of single-degree-of-freedom (SDOF) structures with R-ECD and FVD were derived. Leveraging this stochastic linearization, seismic hazard analysis of these two dampers was carried out. The results indicate that R-ECDs exhibit superior reliability in terms of self-limited output force and their ability to handle large strokes, outperforming FVDs. Moreover, the findings confirm that ECDs are particularly well-suited for long-span structures such as bridges, which are prone to temperature-related influences.
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Data Availability Statement
Some or all data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant Nos. U2141242 and 52208478) and the Natural Science Foundation of Hunan Province (2021JJ30106).
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© 2024 American Society of Civil Engineers.
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Received: May 24, 2023
Accepted: Nov 27, 2023
Published online: Jan 30, 2024
Published in print: Apr 1, 2024
Discussion open until: Jun 30, 2024
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