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001693
2017-12-01

FAQ 001188 | For a support that can only transfer compressive forces, tensile forces are also displayed ...

Question:
For a support that can only transfer compressive forces, tensile forces are also displayed. How is this possible?

Answer:
In a result combination of your model, load cases that act alternatively ("or") are connected in such a way that they act positively once and negatively once. Negative factors in an RC can be problematic if the calculation is nonlinear: The failure of springs, tension members, and so on, then acts in the "wrong" direction and provides the corresponding results.

The RC results are combined from the existing results: if a support has compressive forces in a load case, the value is converted by the minus sign in the combination criterion and applied as a tensile force.

Remedy: Define the load cases that should act negatively in the combination criterion as new load cases with a negative load.