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FAQ, STATIK, Question 4
How do I define a specific response spectrum?
The microzonation of certain areas lead to special spectra, which can not be covered by the standard parameterized types.
Such non standard spectra are defined either by a set of curves or by a set of the parameters S, TB, TC, TD used in the formula for the standard spectra. The program supports both types of input. They are described in chap. C 2.3 (generation 8) or chap. C 4.2 (generation 7) of the manual.