Negative Stiffness Device for Seismic Protection of Structures: Shake Table Testing of a Seismically Isolated Structure
Publication: Journal of Structural Engineering
Volume 142, Issue 5
Abstract
The concept of apparent weakening by adding true negative stiffness to a structure has been previously introduced by the authors in order to reduce simultaneous drifts, accelerations, and displacements in a structure without yielding or permanent deformation in the main system. A novel negative stiffness device (NSD) that generates true negative stiffness has been developed, built, and tested and has been previously described by the authors in terms of operation and analytical and numerical modeling. This paper presents results that represent proof-of-concept for weakening with the use of the NSD based on the shake table testing of a 3-story seismically isolated structure, equipped with these devices complemented by viscous dampers. The NSD is shown to have a significant effect on the superstructure response by reducing floor accelerations, story drift, and the base shear and upon the addition of dampers, also results in a reduction in isolator displacements. Moreover, this paper provides validation of the analytical models that were previously developed by comparison of analytical and experimental results.
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Acknowledgments
Funding by National Science Foundation, grant NSF-CMMI--NEESR-0830391, for this project is gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 5 • May 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Apr 13, 2015
Accepted: Oct 14, 2015
Published online: Jan 7, 2016
Published in print: May 1, 2016
Discussion open until: Jun 7, 2016
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