Equivalent Viscous Damping for Dual Frame-Wall Resilient System
Publication: Journal of Structural Engineering
Volume 150, Issue 10
Abstract
A resilient dual frame-wall lateral force-resisting system, designed to mitigate frame-expansion challenges in self-centering structures, has been introduced. One notable obstacle encountered when applying direct displacement-based design (DDBD) to this dual frame-wall system is the ductility-damping relationship that can be used for estimating nonlinear structural responses. To address this issue, more than 3.5 million damping data points were generated through nonlinear time-history (NLTH) analyses by creating the linearized substitute system. These analyses span a broad range of parameters, including the fundamental period of the original system, ductility, normalized subsystem stiffness ratio, and post-yielding stiffness ratio of the subsystems. The results reveal that the equivalent viscous damping ratio (EVDR) exhibits significant period dependency for a wide range of periods. Both ductility and the subsystem stiffness ratio, which govern the hysteresis response area, exert a substantial influence on EVDR, except for the post-yielding stiffness ratio. Consequently, an EVDR model that takes into account the effective period, ductility, and normalized subsystem stiffness ratio was formulated and was validated using an additional data set of over 0.2 million data points. Ductility-period design displacement spectra were also proposed to illustrate the implementation of the proposed EVDR model and provide an easy way to understand the equivalent procedure.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The research described in this paper was financially supported by the National Natural Science Foundation of China (52278213) and the China Scholarship Council (202108610187). Chuandong Xie would like to express his gratitude to Ms. Yiqing Chen for reviewing and refining the work. Any options, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the sponsors.
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Published In
Journal of Structural Engineering
Volume 150 • Issue 10 • October 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Dec 4, 2023
Accepted: May 3, 2024
Published online: Aug 7, 2024
Published in print: Oct 1, 2024
Discussion open until: Jan 7, 2025
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