When starting the calculation, I receive a warning No. 30015 "Incorrect Addition of Load Cases in the Result Combination!". What is the reason?

Answer

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


This warning appears when trying to add load cases through result-combinations in such structures (see Figure 02).

When adding load cases of the result combination (RC), only the results of the individual load cases are added. This means that the "Nonlinearities" does not have to be displayed correctly because a member could fail e.g. in one load case, but does not in another load case. When using RC's, you would thus add up the results from different structural systems. This leads to incorrect results.

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

As an alternative - if a calculation with the 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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