Stability combinations (linear and nonlinear)

Stability combinations are similar to standard combinations and are used for stability calculations. Before SCIA Engineer version 22.1., there was only one library entity named "stability combinations", and within one project, it was only possible to calculate either only linear or only nonlinear stability. It was not possible to keep the results of both types of analyses. Since SCIA Engineer version 22.1., there are two separate library entities:

Linear stability combination - used for linear stability analyses .

Nonlinear stability combination - used for nonlinear stability analyses .

It is possible to calculate both types in one project, and to keep the results of both analyses simultaneously.

The combinations might be found in: Libraries -> load cases, combinations, as depicted in the figure below:

The logic of both is very similar. Default naming of linear stability combinations starts with SL1, and for nonlinear stability combinations with SN1. For linear stability combination, it is possible to create a new one based on linear combination, and analogically for nonlinear stability combination, it is possible to create a new one from nonlinear combination:

When the linear stability analyses or nonlinear stability analyses are initiated, it is possible for both types of analyses to calculate only some selected combinations (if the checkbox "specify combinations..." for the corresponding type or analysis is off, all the defined combinations of that type will be analysed):

After the calculation is successful, everywhere where the results of stability combinations are required, there is an option to select either linear or nonlinear stability to be considered / displayed:

 

Note: If a stability calculation of certain type is supposed to be carried out, the corresponding type of stability calculation must be defined.