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Response of Equipment in Structures Supported on Resilient-Friction Base Isolators Subjected to Ground Motion

by Alan G. Hernried, Oregon State Univ, Corvallis, United States,
Kai-Ming Lei, Oregon State Univ, Corvallis, United States,



Document Type: Proceeding Paper

Part of: Structural Engineering in Natural Hazards Mitigation

Abstract:

In this paper, the response of equipment in structures on a particular friction-type device, the resilient-friction base isolator, is examined. The R-FBI is composed of layers of Teflon coated steel plates with a central rubber core to provide the restoring force, thus unlike the laminated rubber bearing systems, the vertical and lateral load carrying functions are decoupled. A semi-analytical approach is used to determine the response of the equipment. A single degree of freedom subsystem model is considered and interaction effects between all the subsystems are included in the formulation. The maximum acceleration response of the equipment when the system is subjected to harmonic and earthquake ground motion is determined. The results of a series of numerical experiments which illustrate the effect of subsystem period, subsystem damping, and friction coefficient of the isolator on the response of the equipment are presented. The fixed-base response is also shown for purposes of comparison.

Subject Headings: Ground motion | Friction | Equipment and machinery | Base isolation | Steel plates | Dynamic loads | Vertical loads

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