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- Title
Experimental characterization, design and modelling of the RBRL seismic-isolation system for lightweight structures.
- Authors
Donà, Marco; Muhr, Alan Hugh; Tecchio, Giovanni; Porto, Francesca
- Abstract
The Rolling-Ball Rubber-Layer (RBRL) system was developed to enable seismic isolation of lightweight structures, such as special equipment or works of art, and is very versatile, a great range of equivalent natural frequencies and coefficients of damping being achievable through choice of the system parameters. The necessity to have a simple and effective design procedure has led to a new parametric experimentation at Tun Abdul Razak Research Centre (TARRC) on the rolling behaviour of the RBRL system and load-deflection behaviour of the recentering springs. The experimental results, together with theories for the rolling resistance of a loaded steel ball on a thin rubber layer and the lateral load-deflection behaviour of cylindrical rubber springs, are used to develop a general design method for the RBRL system, which allows the system to be tailored to the specific application. Sinusoidal test results are presented for the small-deflection behaviour of the system, influenced by the presence of a viscoelastic depression on the rubber tracks beneath each ball, and an amplitude-dependent time-domain model is proposed, based on these results and on the steady-state behaviour of the system. The model is validated through comparison with previously performed shaking-table tests. Attention is here restricted to uniaxial behaviour. Copyright © 2016 John Wiley & Sons, Ltd.
- Subjects
ROLLING friction; STATISTICAL correlation; SHAKING table tests; EARTHQUAKE resistant design; AMPLITUDE modulation; TIME-domain analysis
- Publication
Earthquake Engineering & Structural Dynamics, 2017, Vol 46, Issue 5, p831
- ISSN
0098-8847
- Publication type
Article
- DOI
10.1002/eqe.2833