A novel isolation device is introduced to seismically protect slender structures or historic assets within the philosophy of Damage Avoidance Design (DAD). This device is conceived to allow smooth, controlled and damped rocking thanks to spherical contact surfaces, elastic springs which ensure re-centering, frictional layers and viscous elastic dampers able to dissipate energy during motion. The conceptual framework of the device is analyzed, and corresponding equations of motions obtained for the equivalent two degrees-of-freedom system. The proposed Performance Based Approach allows identifying geometric and mechanical features of the system. Extensive dynamic analyses with spectra-compatible ground motions are performed and the primary contribution of friction, developed by the relative slip of the two spherical surfaces, is discussed. Finally, the dynamic response under selected earthquakes is evaluated by comparing the isolated and the corresponding not isolated response, to highlight the beneficial effects produced by the proposed isolation technique.

Dynamics of a new seismic isolation device based on tribological smooth rocking (TROCKSISD) / Froli, Maurizio; Giresini, Linda; Laccone, Francesco. - In: ENGINEERING STRUCTURES. - ISSN 0141-0296. - 193:(2019), pp. 154-169. [10.1016/j.engstruct.2019.05.014]

Dynamics of a new seismic isolation device based on tribological smooth rocking (TROCKSISD)

Linda Giresini;
2019

Abstract

A novel isolation device is introduced to seismically protect slender structures or historic assets within the philosophy of Damage Avoidance Design (DAD). This device is conceived to allow smooth, controlled and damped rocking thanks to spherical contact surfaces, elastic springs which ensure re-centering, frictional layers and viscous elastic dampers able to dissipate energy during motion. The conceptual framework of the device is analyzed, and corresponding equations of motions obtained for the equivalent two degrees-of-freedom system. The proposed Performance Based Approach allows identifying geometric and mechanical features of the system. Extensive dynamic analyses with spectra-compatible ground motions are performed and the primary contribution of friction, developed by the relative slip of the two spherical surfaces, is discussed. Finally, the dynamic response under selected earthquakes is evaluated by comparing the isolated and the corresponding not isolated response, to highlight the beneficial effects produced by the proposed isolation technique.
2019
Damage avoidance design; Rocking; Seismic protection; Seismic isolation; Vibration control; Friction
01 Pubblicazione su rivista::01a Articolo in rivista
Dynamics of a new seismic isolation device based on tribological smooth rocking (TROCKSISD) / Froli, Maurizio; Giresini, Linda; Laccone, Francesco. - In: ENGINEERING STRUCTURES. - ISSN 0141-0296. - 193:(2019), pp. 154-169. [10.1016/j.engstruct.2019.05.014]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1635812
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