Abstract
The objective of this paper is to disclose reduction effects on maximum deformation of base isolation story and maximum acceleration of top story of a base isolation structure by introducing a second isolation story with nonlinear restoring force-deformation relationship into mid story of the structure. The structure with base isolation story and second isolation story into mid story is called as "a multiple isolation structure" in this paper. It is shown that the response reduction effects in multiple isolation structure tend to become large when the second branch of story stiffness of second isolation story becomes small through time-history analyses to recorded earthquake ground motions.
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