(Available for: Spectrum)
Specifies the method for combining shock components acting in the same direction. Select SRSS for a square root of the sum of the squares combination method. Select ABS for an absolute combination method.
This option is typically used with independent support motion load cases, where responses from different support groups caused by excitation in the same direction are combined. It also combines the rare case of multiple uniform shock spectra acting in the same direction. Select ABS for directional combinations of pseudostatic responses, as recommended by USNRC. Select SRSS for force spectrum loads when several loads are all defined with the same shock direction. The loads are then modeled as independent loads. ABS always models as dependent loads. For more information, see Include Pseudostatic (Anchor Movement) Components (Y/N).
Because all time history combinations are done algebraically (in-phase) this parameter
has no effect on time history results.