Response Spectrum Wizard : Eurocode 8 (2003)

The Eurocode 8 : 2003 spectrum is defined by a set of parameters defined in the code.

Subsoil Class

Sites are classed depending on the subsoil as A, B, C, D or E as described in Part 1-1 Table 3.1.

Ratio of Ground Acceleration to Gravity ($a_{gR}$)

The parameter agR is used to characterise the seismicity of the site.

Importance Factor ($γ_1$)

The importance factor allow am amplification for topographical effects depending on the type of structure.

Spectrum

The spectrum can be either an elastic spectrum or a design spectrum.

Structure Damping Ratio ($ξ$)

The spectrum values to use depend on the level of damping in the structure as expressed in the damping ratio. Elastic spectra only.

Behaviour ($q$)

A behaviour factor is defined which adjust the level of the spectral values. Design Spectra only.