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Parameters for Type 1 and 2 Elastic response spectra - EN1998-1 : 2004

June , 17th 2024 | Via: Prontubeam | Seen: 327 times
This image shows the parameters for the calculation of the Type 1 and Type 2 elastic response spectrum. It is based on EN 1998-1:2004.
Parameters for Type 1 and 2 Elastic response spectra - EN1998-1 : 2004
If deep geology is not accounted for, the recommended choice is the use of two types of spectra: Type 1 and Type 2.

If the earthquakes that contribute most to the seismic hazard defined for the site for the purpose of probabilistic hazard assessment have a surface-wave magnitude, Ms, not greater than 5.5, it is recommended that the Type 2 spectrum is adopted. For the five ground types A, B, C, D and E the recommended values of the parameters S, TB, TC and TD are given in the figure above for the Type 1 Spectrum and Type 2 Spectrum. The figure above also shows the shapes of the recommended Type 1 and Type 2 spectra, respectively, normalised by ag, for 5% damping.

Different spectra may be defined in the National Annex, if deep geology is accounted for.

[1] EN 1998-1:2004
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