Source: https://www.eurocodeapplied.com/design/en1998/elastic-response-spectrum
Timestamp: 2019-04-23 00:42:18+00:00

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Calculation of the elastic response spectrum in terms of spectral acceleration and spectral displacement representing the seismic action in the horizontal or vertical direction. Applicable for the design of structures that remain in the elastic range, seismic isolation systems, and calculation of seismic displacements.
Type 1 spectra correspond to typical high seismicity hazard. Low seismicity Type 2 spectra are recommended when the earthquakes that contribute most to the seismic hazard have a surface-wave magnitude, Ms, not greater than 5.5. For more details see EN1998-1 §3.2.2.2(2)P and the National Annex.
In accordance with EN1998-1 §3.2.1(3), §2.1.4 and the corresponding importance factors is given in the relevant Parts of EN1998. An importance factor of γ = 1.0 corresponds to typical structures of average importance.
Typically equal to 5% for concrete structures in the elastic range. If for special cases a viscous damping ratio different from 5% is to be used, this is given in the relevant Part of EN1998.
Ground types A, B, C, D, and described by the stratigraphic profiles and parameters given in EN1998-1 Table 3.1, partially reproduced below. Select 'custom' ground type to manually specify the spectral parameters S, TB, TC, TD etc.
In accordance with EN1998-1 §3.2.2.3(1)P and the National Annex.
It is the acceration ratio of the constant acceration branch to the peak ground acceleration. According to EN1998-1 §3.2.2 the spectral amplification factor F is equal to 2.5 for the elastic spectrum in the horizontal direction, 3.0 for the elastic spectrum in the vertical direction, and 2.5 for the design spectrum in both horizontal and vertical directions.
In accordance with EN1998-1 §3.2.2.2(3) and the National Annex. A value of S = 1 is applicable for rock by definition. For more flexible soils S > 1.
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