Improved Coefficient of Restitution Estimation for Free Rocking Members
Publication: Journal of Structural Engineering
Volume 142, Issue 12
Abstract
In 1963, a geometry-dependent approach to estimate the coefficient of restitution (COR) was proposed for free rocking structures. Since then, this estimation has been reported as being consistently lower than results obtained from experimental data. An assumption used by the original model is shown to be the cause of this underestimation. Identifying that the rocking takes place over a contact region, this study introduces a modified formulation for free rocking bodies and proposes an improved COR estimation to accurately quantify the energy dissipation of these structures. Using experimental data, it is shown that the improved CORs consistently provide better correlation to those established from tests than the COR obtained from the original approach.
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Acknowledgments
The work presented in the paper was undertaken as part of the “NEES Rocking Wall” project, with funding from the National Science Foundation (NSF) under Grant No. 1041650 and Precast/Prestressed Concrete Institute (PCI). Dr. Joy Pauschke served as the program manager for the NSF grant. Any opinions, findings and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of NSF or PCI.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jun 25, 2015
Accepted: May 1, 2016
Published online: Jul 12, 2016
Published in print: Dec 1, 2016
Discussion open until: Dec 12, 2016
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