After a harmonic analysis, why doesn't the POST26 value for the amplitude of S1 match the POST1 value computed with the HRCPLX command?

The HRCPLX command is a macro which does an SRSS load case combination to obtain the amplitude of a complex solution. By default, the combination is done on the component stresses and derived quantities like S1 are computed from the combined components.

If you want to use HRCPLX to obtain the amplitude of derived quantities, you should issue the command SUMTYPE,PRIN first. Then the combination will be done directly on the derived quantities instead of the components and the POST1 values will agree with the POST26 values.

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