Seismic Action (Target Spectrum)

Herein the elastic response spectrum is determined, and scaled to the values of the design ground acceleration established for the different Limit States. The elastic response spectrum can be derived from the code used in the specific project (Code-Based Spectra option) or it can be defined by the user (User–Defined Spectrum option). In the case of Code-Based Spectra, users should assign the basic parameters needed for the generation of the spectral shape (i.e. peak ground acceleration, damping, spectrum type, ground type and important class).

In the case of User Defined Spectra, users can select from a list of 29 spectra defined by various National Codes across the world (Code-Based Spectrum option), where again they should supply the basic parameters for the definition of the spectral shape. There is also the option to upload an accelerogram based on which the elastic response spectrum will be calculated (Spectrum from loaded accelerogram option) or to upload an elastic spectrum from a file (Load Spectrum from file option).