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Erschienen in:
1997 | OriginalPaper | Buchkapitel
Coupled Lateral-Torsional Response of Seismically Isolated Buildings
verfasst von : James M. Kelly
Erschienen in: Earthquake-Resistant Design with Rubber
Verlag: Springer London
Enthalten in: Professional Book Archive
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A base-isolated building is unusual in that its frequencies in both horizontal directions are the same or very nearly the same because of the isotropic response of the isolators. The torsional frequency can be close to the horizontal frequencies if the stiffness of an isolator is matched to the load on that isolator, raising the possibility of a coupling between the three lowest modes if there is an imbalance between the center of mass and the center of rigidity.