A Probabilistic Comparative Study of Various Base Isolation Systems—Nonstationary Earthquake Excitationby Lin Su, Clarkson Univ, United States,
Goodarz Ahmadi, Clarkson Univ, United States,
Iradj G. Tadjbakhsh, Clarkson Univ, United States,
Abstract: A probabilistic comparative study of various base isolation systems is carried out. The laminated rubber bearing with and without lead plug, the resilient-friction, and the EDF base isolation systems are studied. A nonstationary stochastic model for earthquake ground acceleration is considered. The method of equivalent linearization in conjunction with the moments of the Fokker-Planck equation is used for response analysis. An excitation intensity corresponding to the N00W component of El Centro 1940 earthquake is considered and the root-mean-square displacement and velocity responses of a rigid structure with various base isolation systems are evaluated. Several Monte-Carlo digital simulation studies are also performed. The results are compared with those of the statistical linearization method and good agreements are observed. It is concluded that the friction-type base isolation systems lead to lower mean-square and peak responses.
Subject Headings: Base isolation | Comparative studies | Earthquakes | Probability | Excitation (physics) | Friction | Linear analysis | Statistics
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