Adaptive Negative Stiffness: A New Structural Modification Approach for Seismic Protection

Satish Nagarajaiah; Dharma T.R. Pasala; Andrei Reinhorn; Michael Constantinou; Apostolos A. Sirilis; Douglas Taylor

doi:10.4028/www.scientific.net/AMR.639-640.54

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 639-640Adaptive Negative Stiffness: A New Structural...

Adaptive Negative Stiffness: A New Structural Modification Approach for Seismic Protection

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 re-centering mechanism thereby avoids permanent deformation in the composite structure-device assembly unless, the main structure itself yields. Essentially, a yielding-structure is “mimicked” without any, or with minimal permanent deformation or yielding in the main structure. As a result, the main structural system suffers less accelerations, less displacements and less base shear, while the ANSS “absorbs” them. 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 to a structural system with supplemental passive dampers is presented. A companion paper presents the NSD and its mechanics in detail.

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Periodical:

Advanced Materials Research (Volumes 639-640)

Pages:

54-66

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.639-640.54

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Online since:

January 2013

Authors:

Satish Nagarajaiah, Dharma T.R. Pasala, Andrei Reinhorn, Michael Constantinou, Apostolos A. Sirilis, Douglas Taylor

Keywords:

Adaptive Negative Stiffness Device, Adaptive Negative Stiffness System, Inelastic Response, Passive Control, Seismic Protection, Structural Control

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