Name of the variable that describes the response spectrum
The default name will be set up as IRC_Sa. A two-digit alpha-numeric postfix can be added to that name (e.g. in case that more than one response spectrum is generated to not overwrite the existing ones).
The variable (and the related variables, formulas and tables) is stored in Properties > Variables and can be used when defining the earthquake load (Schedule > Load Definition > Earthquake Load).
The variable describing the response spectrum will be given in terms of Sa/g (-) as a function of the period T (s).
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