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2021-03-03

Using Modified Stiffnesses for Dynamic Calculations

In the present example, the stiffness of the reinforced concrete columns is to be reduced in order to simulate state II.

The reduction with the factor 0.6 is carried out at the level of the "Rectangle 300/300" cross-section.

In order to consider these modifications of the cross-section when determining the natural frequencies, you have to select the second option under the calculation parameters under "Stiffness Modifications".

Due to the reduced stiffness, there is thus a lower natural frequency for the first mode shape.


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