A Probabilistic Comparative Study of Various Base Isolation Systems—Nonstationary Earthquake Excitation

by Lin Su, Clarkson Univ, United States,
Goodarz Ahmadi, Clarkson Univ, United States,
Iradj G. Tadjbakhsh, Clarkson Univ, United States,

Document Type: Proceeding Paper

Part of: Probabilistic Methods in Civil Engineering


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) | Dynamic structural analysis | Friction | Stochastic processes

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