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Seismic protection of structures with supplemental rotational inertia

Seismic protection of structures with supplemental rotational inertia

Makris, Nicos and Kampas, Georgios (2016) Seismic protection of structures with supplemental rotational inertia. Journal of Engineering Mechanics, 142 (11):04016089. ISSN 0733-9399 (Print), 1943-7889 (Online) (doi:https://doi.org/10.1061/(ASCE)EM.1943-7889.0001152)

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Abstract

In this paper we investigate the alternative strategy of suppressing ground-induced vibrations with supplemental rotational inertia. The proposed concept employs a rack-pinion-flywheel system that its resisting force is proportional to the relative acceleration between the vibrating mass and the support of the flywheels. This arrangement, known in the mechanical networks literature as the “inerter”, complements the traditional supplemental damping and stiffness strategies used for the seismic protection of structures. The paper shows that the seismic protection of structures with supplemental rotational inertia has some unique advantages; in particular in suppressing the spectral displacements of long period structures –a function that is not efficiently achieved with large values of supplemental damping. The paper shows that this happens at the expense of transferring appreciable forces at the support of the flywheels and proceeds by examining to what extent the finite stiffness and damping of the support of the flywheels affects the dynamics of the system. The proposed concept may be attractive for the seismic protection of bridges given that the rack-pinion-flywheel system strategy can accommodate large displacements.

Item Type: Article
Uncontrolled Keywords: Inerters; seismic isolation; smart structures; inertoelasticity; seismic protection; bridges
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Department of Engineering Science
Last Modified: 16 Aug 2019 11:56
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: GREAT b
Selected for GREAT 2019: GREAT 4
URI: http://gala.gre.ac.uk/id/eprint/19466

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