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    Seismic Loads on Buildings in Germany

    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.

  2. Figure 01 - Spectral Acceleration Sa [m/s²] Versus Natural Frequency f [Hz] of Narrow-Band Response Spectrum According to EN 1998-1 [1]

    ZPA Method in Response Spectrum Analysis

    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 [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.

  3. 1 - Reduction of building on cantilever structure. The individual mass points represent storeys. Displacement due to compression normal forces shown in (a) is converted to (b) overturning moments or lateral loads [2].

    Considering Second-Order Theory in Dynamic Analysis

    For the ultimate limit state design, EN 1998‑1 [1], Section 2.2.2 and 4.4.2.2, 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.

  4. Import of Masses with RF-/DYNAM Pro - Natural Vibrations

    Import of Masses with RF-/DYNAM Pro - Natural Vibrations

    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.

  5. Figure 01 - Determining Equivalent Loads According to DIN EN 1998 with RF-/DYNAM Addition II

    Determining Equivalent Loads According to DIN EN 1998

    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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