Vertical Accelerations in Rolling Isolation Systems: Experiments and Simulations
Publication: Journal of Engineering Mechanics
Volume 142, Issue 3
Abstract
Rolling isolation systems (RISs) have been used extensively to protect bridges, buildings, and equipment from earthquake-induced ground and floor motions. RISs are attractive in a performance-based design context because horizontal acceleration design requirements may easily be met by adjusting the slope of the rolling surface. However, in the process of reducing horizontal accelerations, the isolator transmits vertical accelerations due to the pendulumlike motion. These vertical accelerations may exceed tolerable limits if left unchecked. In this study, the influence of the rolling surface profile on peak vertical accelerations is assessed through experiments and simulations. RISs with different radii of curvature are fabricated and then tested for a wide range of ground-motion frequencies and amplitudes. The experiments and simulations show that vertical accelerations are not negligible and should not be ignored in the design of RISs.
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Acknowledgments
The author thanks Skylar J. Calhoun for his help fabricating the experimental rolling isolation system tested in this study and Dovie M. Rayburn for collecting the measured data presented herein.
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Published In
Journal of Engineering Mechanics
Volume 142 • Issue 3 • March 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jun 13, 2015
Accepted: Aug 24, 2015
Published online: Oct 7, 2015
Published in print: Mar 1, 2016
Discussion open until: Mar 7, 2016
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