In a load case, compressive forces in a cable arise. What is the explanation for this?

Answer

Compressive forces in cables or tension members may arise if the number of iterations is not sufficient for this analysis so that the system did not converge. The number of iterations can be specified in the Global Calculation Parameters tab of Calculation Parameters (see figure).

For the maximum number of iterations, the value 100 is preset. However, this does not mean that all iterations will be run. Depending on the structural system, the calculation often converges much earlier.

Check also the settings of Reactivation of Failing Members. If the option 'Assign reduced stiffness to failing members' is selected, small compressive forces may arise.

If this is not justifiable, select the option 'Failing members to be removed individually during successive iterations'. However, you should pay attention to the sufficient maximum number of iterations (see above).

Keywords

failing members iteration reactivation compressive force small stiffness convergence calculation parameters

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