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What are the Participation Factors and the Captured Modal Mass in the frequency report?

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What are the Participation Factors and the Captured Modal Mass in the frequency report?

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The participation factor is a measure of the importance of the mode in earthquake type load. The captured modal mass is another way of quantifying the importance of the mode and the two are related. The captured modal mass percentage tells how much of the response is atributed to a particular mode and also tells on the mode orientation (X,Y or Z). The sum of modal masses should be 100% if all modes are counted. But since many modes are not counted, the sum is less than 100 and hence the importance of the ZPA and missing mass options for dynamic analysis. Please refer to the topic “Missing Mass and ZPA Correction” in the online help for more information. The participation factors are calculated from the product of the mode shape, the mass matrix and a vector of ones. For mode i the participation factor is calculated as: Participation_Factor_i= Transpose(ModeShape_i) * MassMatrix * {1} The mode shape is mass normalized. The above equation is used three times for X, Y and Z directions. Th

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