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RFEM 5

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7.3.2 Result Combinations

Result Combinations

For basic information about superpositioning load cases in result combinations, see Chapter 5.6.

Figure 7.24 Calculation Parameters dialog box, Result Combinations tab

In the Existing Result Combinations dialog section, you can find a list of all created or generated result combinations. You can edit the Calculation Parameters of the selected entry in the dialog section to the right.

Options

The Quadratic Combination is deactivated by default. Thus, internal forces are superimposed additively:

B=A1+A2++An 

The default setting is suitable for most application cases. However, a square addition of internal forces is relevant for dynamic analyses when combining load cases due to centrifugal forces, for example. In this case, the Pythagorean sum is created as follows:

B=A12+A22++An2 

When the square addition is activated, you can use the Positive/Negative options to decide, which extreme values of the load cases are considered in the superposition and if you want to Preserve signs. In this way, the extreme values of the modal internal forces and deformations as well as the results belonging to the governing component can be determined with the correct signs.

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