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Experimental and analytical studies on the performance of hybrid isolation systems
Author(s) -
Chang ShihPo,
Makris Nicos,
Whittaker Andrew S.,
Thompson Andrew C. T.
Publication year - 2002
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.117
Subject(s) - earthquake shaking table , base isolation , structural engineering , seismic isolation , displacement (psychology) , isolation (microbiology) , tuned mass damper , damper , engineering , natural rubber , geotechnical engineering , geology , materials science , mechanical engineering , psychology , microbiology and biotechnology , frame (networking) , composite material , psychotherapist , biology
This paper presents experimental and analytical results on the seismic response of a rigid structure supported on isolation systems that consist of either lead rubber or sliding bearings. Shake table tests are conducted with various levels of isolation damping that is provided from the bearings and supplemental viscous fluid dampers. The table motions originated from recorded strong ground motions that have been compressed to the extent that the mass of the model structure corresponds to the mass of a typical freeway overcrossing. Experimental data are used to validate mechanical idealizations and numerical procedures. The study concludes that supplemental damping is most effective in suppressing displacements of rigid structures with moderately long isolation periods ( T I ≤3 sec) without affecting base shears. Friction damping is most effective in suppressing displacement amplifications triggered by long duration pulses—in particular, pulses that have duration close to the isolation period. Copyright © 2001 John Wiley & Sons, Ltd.