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 ()

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 ()

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

Behaviour ()

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