000021948 001__ 21948
000021948 005__ 20170622131313.0
000021948 04107 $$aeng
000021948 046__ $$k2017-06-15
000021948 100__ $$aDonà, Marco
000021948 24500 $$aEFFECTIVENESS OF THE RBRL ISOLATION SYSTEM: EVIDENCES FROM SEISMIC TESTS AND NUMERICAL SIMULATION

000021948 24630 $$n6.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000021948 260__ $$bNational Technical University of Athens, 2017
000021948 506__ $$arestricted
000021948 520__ $$2eng$$aThe Rolling-Ball Rubber-Layer (RBRL) system was developed to enable seismic isolation of low-mass structures, such as works of art or special equipment, and is very versatile, a great range of equivalent natural frequencies and coefficients of damping being achievable through the independent choice of the system parameters. The paper presents new results from a previous campaign of shaking-table tests (PSTRBIS ECOEST 2 Project, 1999), related to a superstructure model consisting of two concrete slabs separated by four M16 studs 500mm long, which give a first mode fixed-base response at about 2.5 Hz. In particular, attention is given not only to the global behaviour of the system, which includes the steadystate rolling, but also to its small-deflections behaviour, influenced by the creation of pits in the rubber layer due to its viscoelastic properties. These experimental results are compared to those obtained from numerical simulations, conducted in OpenSees, using a FE fixed-base model previously calibrated using other shaking-table tests performed at fixed-base. These comparisons, isolated (test) versus fixed (model) case, are presented in terms of peak values of acceleration and inter-storey drift, time-history accelerations and displacements and by means of response spectra ratios for both the slabs, and show the effectiveness of the system not only at large displacement but also for small deflections if compared with an equivalent sliding isolation system. Attention is here restricted to uniaxial behaviour. Finally, some considerations are made regarding a possible characteristic frequency of roll-out of the balls from their initial pits.

000021948 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000021948 653__ $$aSeismic isolation system for content, rolling on rubber tracks, viscoelastic indentation effect, fuse behaviour.

000021948 7112_ $$aCOMPDYN 2017 - 6th International Thematic Conference$$cRhodes Island (GR)$$d2017-06-15 / 2017-06-17$$gCOMPDYN2017
000021948 720__ $$aDonà, Marco$$iModena, Claudio$$iSalvia, Simone$$iTecchio, Giovanni$$iMuhr, Alan H.
000021948 8560_ $$ffischerc@itam.cas.cz
000021948 8564_ $$s2256933$$uhttps://invenio.itam.cas.cz/record/21948/files/18432.pdf$$yOriginal version of the author's contribution as presented on CD, section: [MS02] Experimental measurements and numerical simulation on problems in the field of Earthquake
.
000021948 962__ $$r21500
000021948 980__ $$aPAPER