How can I calculate the softening damage index by using period of undamaged and damaged frame structure subjected to ground motion?

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Robert K Vincent

I am not familiar withthe softening damage index, but I would recommend looking into INSAR (maybe it is called something else now) data, which compares slight changes in topography with interferrograms of radar data from one date to another. Your Friend, Dr. Robert K. Vincent (Bob)

Khadije Vakili

Dear Dr Robert

thanks a lot for your kind help.