Figure : Working Process of Passive Protection
System[12].
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BASE ISOLATION
Seismic base isolation is a design strategy based on the principle that
it is both possible and feasible to uncouple the structure from the
ground and thereby protect it from the damaging effects of earthquake
motions. To achieve this result, while at the same time satisfying all
of the in-service functional requirements, additional flexibility is
introduced usually at the base of the structure. Additional damping is
also provided so as to control the deflections which occur across the
isolation interface.
As for all the load cases, we encounter in the design process, such as
gravity and wind, we work to meet a single basic equation: