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Observing dynamic characteristics (modal frequencies) in nonlinear staged construction analysis SAP

Observing dynamic characteristics (modal frequencies) in nonlinear staged construction analysis SAP

Observing dynamic characteristics (modal frequencies) in nonlinear staged construction analysis SAP

(OP)
Hi all,

I want to observe how the modal frequencies varies with time ( in a model built with time dependent properties) and each stage. Say for example after 1 year, 5 years, 10 years etc. I used the non linear staged construction analysis for this purpose. But I could only observe the deformed shapes at end of each stage construction.
I would be very much grateful if you can guide me how to obtain the modal frequencies (and associated mode shapes ) for at least first three modes using non linear staged construction analysis in SAP2000.

Thank You in advance for your time and consideration in this regard

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