When starting the calculation, I get the warning No. 30015: "Incorrect addition of load cases in the result combination!". What is the reason?

Answer

Check if you have entered "Nonlinearities" in your structure. For example, "Ineffective Supports," "Members with Nonlinearities (Compression or Tension Members)," or "Nonlinear Material Behavior" (see Figure 01).

When you try to add load cases using result combinations in such structures, the warning appears (see Figure 02).

When adding load cases of the result combination (RC), the results of the individual load cases are only added. This means that the "Nonlinearities" cannot be displayed correctly as the member could fail, for example, in one load case, but not in another load case. Therefore, you would add the results from different structural systems when using RCs. This leads to the incorrect results.

Please, use load combinations (COs) in such situations. In this case, a large load case (load combination) will be generated and this load situation will be calculated in a summarized form. This should enable a correct representation of nonlinearities in the structure.

As an alternative, if the calculation with RCs is required due to the calculation time, you can consider whether the nonlinearities will be absolutely necessary.

Keywords

Warning 30015 Warning Error Incorrect addition Result combination

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