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In the stability analysis in RSKNICK, I get the following error message: "The model is not coherent because there are independent submodels." What does that mean and what can I do about it?

Answer

Independent submodels are not interconnected and are considered as separate submodels in the calculation. They are thus independent models without influencing each other (see Figure 2).

It is recommended to edit submodels separately as individual files. Then a stability analysis with RSKNICK is possible.
Otherwise, the partial models must be connected to each other. In this case, it should be taken into consideration that the static systems of the submodels should be retained when the submodels merge into an overall model (see Figure 3).

The feature "Independent Systems" is helpful in detecting partial models. This finds all independent systems and lists them as groups (see Figure 4).
One finds this function under Extras -> Model control -> Independent systems.

Keywords

Independent submodels No coherent model Unconnected submodels Stability analysis Stability analysis 684

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RSTAB Main Program
RSTAB 8.xx

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The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

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Stability analysis according to the eigenvalue method

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