The structural analysis software RFEM 6 is the basis of a modular software system. The main program RFEM 6 is used to define structures, materials, and loads of planar and spatial structural systems consisting of plates, walls, shells, and members. The program also allows you to create combined structures as well as to model solid and contact elements.
RSTAB 9 is a powerful analysis and design software for 3D beam, frame, or truss structure calculations, reflecting the current state of the art and helping structural engineers meet requirements in modern civil engineering.
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The RSTAB 9 solver automatically selects the best strategy and tries to solve all nonlinearities at once. If that fails, the nonlinearities are solved one by one. Nonlinearities of hinges and supports are considered in the same way.
In RFEM 6, it is necessary to make the corresponding settings in the "Edit Static Analysis Settings" dialog box in the "Reactivation" tab; see the image.
The compression forces in cables or tension members can be displayed if the number of iterations was not sufficient for the calculation, and thus no convergence was achieved. You can set the number of iterations in the calculation parameters in the Global Calculation Parameters tab (see Image 01).
The maximum number of iterations is set to 100 by default. However, this does not mean that all iterations will be run. Depending on the structural system, the calculation often converges much earlier.
Also, check the settings for Reactivation of Failing Members. When selecting the "Assign reduced stiffness to failing members" option, small compressive forces may arise.
If this is not justifiable, select the "Failing members to be removed individually during successive iterations" option. However, you should pay attention to the sufficient maximum number of iterations (see above).