The negative stiffness offered by bi-stable mechanisms can improve the dynamic performance of a structure. In this work the effects of adding negative stiffness and shape memory alloy (SMA) damping in base-isolated structures are explored through the study of the stationary response for different values of negative stiffness and SMA hysteretic damping ratio. The frequency response curves of the isolated structure, with and without the negative stiffness contribution, are numerically obtained for different levels of excitation amplitude in order to evaluate the acceleration and displacement transmissibility curves. The benefits of negative stiffness, damping amplification and reduced transmissibility of accelerations and displacements, as well as the existence of dynamic instabilities, are illustrated.

Nonlinear dynamic response of an isolation system with negative stiffness and shape memory alloy (SMA) based damping / Salvatore, A.; Carboni, B.; Lacarbonara, W.. - 2:(2020). (Intervento presentato al convegno ASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC-CIE 2020 tenutosi a Saint Louis, Missouri) [10.1115/DETC2020-22541].

Nonlinear dynamic response of an isolation system with negative stiffness and shape memory alloy (SMA) based damping

Salvatore A.
Primo
;
Carboni B.
Secondo
;
Lacarbonara W.
Ultimo
2020

Abstract

The negative stiffness offered by bi-stable mechanisms can improve the dynamic performance of a structure. In this work the effects of adding negative stiffness and shape memory alloy (SMA) damping in base-isolated structures are explored through the study of the stationary response for different values of negative stiffness and SMA hysteretic damping ratio. The frequency response curves of the isolated structure, with and without the negative stiffness contribution, are numerically obtained for different levels of excitation amplitude in order to evaluate the acceleration and displacement transmissibility curves. The benefits of negative stiffness, damping amplification and reduced transmissibility of accelerations and displacements, as well as the existence of dynamic instabilities, are illustrated.
2020
ASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC-CIE 2020
High-static-low-dynamic stiffness isolator; Negative stiffness; Pseudo-elastic hysteresis; Quasi-zero-stiffness isolation
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Nonlinear dynamic response of an isolation system with negative stiffness and shape memory alloy (SMA) based damping / Salvatore, A.; Carboni, B.; Lacarbonara, W.. - 2:(2020). (Intervento presentato al convegno ASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC-CIE 2020 tenutosi a Saint Louis, Missouri) [10.1115/DETC2020-22541].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1467658
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