The add-on response spectrum method is an extension of the modal analysis . Earthquake analyzes are carried out using the multimodal response spectrum method. The spectra required for this can be created in compliance with the standards or user-defined. The resulting forces and deformations are calculated from these specifications.
The main features of the 'Response Spectrum Method' add-on are:
- Library of response spectra of numerous standards (EN 1998, DIN 4149, ASCE 7 - IBC, SIA 261, ...)
- Possibility for user-defined response spectra or generated from accelerograms
- Direction-relative response spectrum approach
- Manual or automatic selection of the relevant mode shapes for response spectrum, e.g. for application of the 5% rule according to Eurocode 8
- Formation of result combinations by modal superposition (SRSS or CQC rule) and directional superposition (SRSS or 100%/30% rule)
- Optional automatic consideration of accidental torsional effects