I am not quite sure what your questions is .
As far as I understand, you want to calculate a structure according to the response spectrum analysis method. As a consequence you have to superpose the modal results (e.g. bending moment) an the directional components. For both results you have to choose the superposition method. These methods are defined within different DYNA commands.
CTRL STYP CQC:
Superposition of the horizontal seismic action.
According to EC1998-1 188.8.131.52(3) the response spectrum has two orthogonal components. Both of these components have to be taken into account. Therefore you have to superpose the directional components or the results in x- or y-direction.
(source DIN EN 1998-1:2010-12, chapter 184.108.40.206.1(3))
EXTR … STYP CQC:
Superposition of the individual modal contributions (results).
Further information can be found in our online tutorial.
www.sofistik.com > Infocenter - Overview > Documentation - Tutorials > Dynamic analysis > Earthquake Analysis with RSA
Or you look at our corresponding TEDDY example.
TEDDY > File > Examples > dyna > english > dyna_superposition_response.dat
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