Response Spectrum Wizard : Ordinanza PCM 3274

The Ordinanza PCM 3274 (Italian) spectrum is defined by a set of parameters defined in the code.

Seismic Zone

The seismic zones are defined as 1, 2, 3 or 4.

Subsoil Class

Sites are classed depending on the subsoil as A, B, C, D or E.

Ratio of Ground Acceleration to Gravity ($a_g$)

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

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.