The analysis procedure can be selected in by user according to Codes.
International Design Codes
ASCE 7-16 : Analysis Procedure Selection per ASCE 7-16 §12.6
TSC 2018 : Linear Dynamic Analysis
The seismic analysis procedure should be selected in accordance with the conditions given in the seismic design Codes. The three basic procedures provided in Codes are the Equivalent Lateral Force, Modal Response Spectrum and Linear Response History. In addition, nonlinear analysis procedures used to determine building performance are also specified in seismic design Codes.