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How many mode shapes do I need to consider in the dynamic analysis?

Answer

In principle, you need to consider so many mode shapes that the sum of the effective modal masses (that is, for a normalization of Mi = 1, the sum of the quadrats of the involved factors) is at least 90 % of the effective total mass.

For this, it is also useful to also calculate the equivalent masses in Window 1.1 General Data.

Keywords

Modal mass factor Seismicity Eigenvector Dynamic analysis Mass

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