Performance and Reliability Analysis of Semi-Active Equipment Isolation System
Date Issued
2008
Date
2008
Author(s)
Fan, Yu-Cheng
Abstract
Critical non-structural equipment, including life-saving equipment in hospitals, circuit breakers, computers, high technology instrumentations, etc., are venerable to strong earthquakes, and the failure of these equipments may result in a heavy economic loss. In this connection, innovative control systems and strategies are needed for their seismic protections. The purpose of this thesis is to investigate performance evaluation of passive and semi-active control in the equipment isolation system for earthquake protection. Through shaking table tests of a 3-story steel frame with equipment on the first floor, a Magneto-Rheological (MR) damper together with a sliding rolling pendulum isolation system is placed between the equipment and floor to reduce the vibration of the equipment. Various control algorithms are used for these semi-active control studies, including the decentralized sliding mode control (DSMC) and LQR control. The passive-on and passive-off control of MR damper is used as a reference for the discussion on the control effectiveness. Finally, the reliability analysis for the development of probabilistic seismic demand curves is used to determine the probability of the equipment response measure.
Subjects
Decentralized control
Sliding mode control
Equipment isolation
MR-damper
Reliability analysis
Type
thesis
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