Ross,
Perhaps we should phrase the text in the
User's Guide a little better. The best
explanation of the combination methods can be found in the
Help Text for this particular
option. Just click on the
Combination Method cell and press
[F1]. Here you will find:
Algebraic Combinations:- Displacemenets and Forces are the algebraic combination of the displacement and force vectors.
- Stresses are
not combined, instead they are calculated from the algebraically combined forces and moments.
Scalar Combinations:- Displacemenets and Forces are the algebraic combination of the displacement and force vectors.
- Stresses are the scalar combination of the stress values (scalars).
The
Help Text goes on to state that
The Displacement and Forces of Algebraic and Scalar cases are equivalent. There may be a variation at the stress level, since in an Algebraic combination the stresses are calculated while in a Scalar combination they are combined.
Note the numeric example given here also.
You also asked:
Does this mean that C2 only looks at the stresses from the contributing load cases, and then combines these using the scalar method? In other words, where stress is specified, C2 does not carry out any combination operations on displacements, forces, moments etc.
always computes all values of displacement, force, and stress. The
Output Type setting simply limits what is available for review at the output level. This setting can be used to minimize the amount of data inexperienced users may misinterpret (such as stresses from an OPE case or displacements/forces from an OCC combination case).
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