Implementation of the «Residual Term» Concept in Seismic Analysis by Modal and Spectral Methods

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Rubric:     Theoretical and experimental studies   
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Modal method and spectral method of seismic analysis are discussed. The concept of «residual term», enabling to account for the seismic response along high-frequency modes instead of excluding this response is presented. Such an approach is required by standards in nuclear industry. The author comments on the implementation of the «residual term» concept in the software. In particu­lar, the differences between «additional modes» and traditional natural modes are discussed.