Dear researchers

What is your opinion about the criterion recommended in seismic codes for determining scaling period, which are used to scale ground motion records?

As you know, the mentioned criterion is the period of the structure’s dominant mode, which has the largest modal participating mass ratio (usually the first vibration mode). Hence, the period of the mode with the second largest modal participating mass ratio is not considered in the scaling process. Consequently, although this criterion usually results in the largest value of scaling period, it is not logical ones.

This is especially important when Tuned Mass damper (TMD) or Base-Isolation system is utilized, which cause the modal properties of the structures to change.

I used a new criterion based on the weighted mean value of the periods for the structures equipped with TMD.

Have you used any criteria other than the criterion mentioned in the seismic codes?

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