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colum plus Isolator should give me a period theoretical

colum plus Isolator should give me a period theoretical

colum plus Isolator should give me a period theoretical

(OP)
I want to make a verification

but need a linear analysis and then I select a rubber isolator
Now the problem is that the theoretical period isnt the same that ETABS

How I should make my analysis or How I could introduce the stiffness of isolator?

UNDER THE SIMPLE MODEL

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