Why the time period of the first 4 modes are too large , although i checked the modal and there are no errors or warnings?

12 November 2021 1 6K Report

Etabs modal participation mass ratio

In his name is the judge

it may because of two things, first you assign very large load on points or elements, second you may define stiffness of your material or element truly wrong. in these two case consider units of your model & loading.

I hope I helped.

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