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The Knowledge Base includes technical articles on a wide array of structural analysis and design topics.
These articles are intended to help you navigate through the Dlubal programs, learn efficient tips and tricks, and provide further insight to the program features.
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DIN EN 1998-1 with the National Annex DIN EN 1998-1/NA specifies how to determine seismic loads. The standard applies to structural engineering in seismic areas.
In a multi-modal response spectrum analysis, it is important to determine a sufficient number of eigenvalues of the structure and to consider their dynamic responses. Regulations such as EN 1998-1  and other international standards require to activate 90 % of the structural mass. This means: to determine as many eigenvalues that the sum of the effective modal mass factor is greater 0.9.
For the ultimate limit state design, EN 1998‑1 , Section 2.2.2 and 184.108.40.206, require the calculation considering the second‑order theory (P‑Δ effect). This effect need not be taken into account only if the interstorey drift sensitivity coefficient θ is less than 0.1.
Since RFEM version 5.04.xx and RSTAB version 8.04.xx the new module RF‑/DYNAM Pro - Natural Vibrations is available. Masses can now be imported directly from load cases and load combinations.
RF-/DYNAM Addition II allows you to determine loads due to equivalent seismic loads according to the multi‑modal response spectrum method. In the example shown here, this was done for a multi‑mass oscillator. The cantilever was therefore subdivided into seven nodes. In the calculation, the equivalent load and the distribution on the individual nodes were determined with the first eigenvector of the system. The required eigenfrequency and the according equivalent mass factor were determined in RF‑/DYNAM Basic.
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