Adaptive Negative Stiffness: New Structural Modification Approach for Seismic Protection
Publication: Journal of Structural Engineering
Volume 139, Issue 7
Abstract
Yielding can be emulated in a structural system by adding an adaptive negative stiffness device (NSD) and shifting the yielding away from the main structural system, leading to the new idea of apparent weakening that occurs, ensuring structural stability at all displacement amplitudes. This is achieved through an adaptive negative stiffness system (ANSS), a combination of NSD and a viscous damper. By engaging the NSD at an appropriate displacement (apparent yield displacement that is well below the actual yield displacement of the structural system) the composite structure-device assembly behaves like a yielding structure. The combined NSD-structure system presented in this study has a recentering mechanism that avoids permanent deformation in the composite structure-device assembly unless the main structure itself yields. Essentially, a yielding-structure is mimicked with no, or with minimal, permanent deformation or yielding in the main structure. As a result, the main structural system suffers less acceleration, less displacement, and less base shear, while the ANSS absorbs these effects. This paper presents comprehensive details on development and study of the ANSS/NSD. Through numerical simulations, the effectiveness and the superior performance of the ANSS/NSD as compared with a structural system with supplemental passive dampers is presented. A companion paper presents the NSD and its mechanics in detail.
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Acknowledgments
Funding by National Science Foundation, grant NSF-CMMI-NEESR-0830391, for this project with Dr. Joy Pauschke as program director is gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 139 • Issue 7 • July 2013
Pages: 1112 - 1123
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jun 23, 2011
Accepted: Mar 30, 2012
Published online: Apr 3, 2012
Published in print: Jul 1, 2013
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