| Summary: | The response of lightweight equipment in structures supported on
resilient-friction-base isolators (R-FBI) subjected to harmonic ground motion and various
earthquake ground motions is examined. The equipment-structure base system is modeled
as a three degree-of-freedom discrete system (SDOF subsystems). An efficient
semi-analytical numerical solution procedure for the determination of equipment response
is presented. Parametric studies to examine the effects of subsystem frequency (isolator,
structure, equipment), subsystem damping, mass ratio, friction coefficient and frequency
content of the ground motion on the response of the equipment are performed. The
equipment response on a fixed-base structure subjected to ground motion is also
calculated. Friction type isolation devices can induce high frequency effects in the isolated
structure due to the stick-slip action. These effects on equipment response are examined.
The results show that the high frequency effect in the structure generated from a
friction-type base isolator doesn't, in general, cause amplifications in the response. The
R-FBI system appears to be an effective aseismic base isolator for protecting both the
structure and sensitive internal equipment. === Graduation date: 1992
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