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Frequently Asked Questions (FAQ)
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AnswerSince the equivalent member designs of Eurocode 3 have different interactions than are the case for the designs according to the partial internal forces method and a mixture of these different designs is not desired for reasons of clarity, RFEM deactivates the equivalent member designs when using the RF-/STEEL Plasticity add-on.
This check box activates, for example, the usage of Simplex Method also for I‑sections, which would otherwise be automatically designed by using Partial Internal Forces Method (PIFM) including redistribution.
If you deactivate the checkbox, Simplex Method or Partial Internal Forces Method (depending on the selection) will only be used if there is a general cross-section available (for example, from SHAPE‑THIN).
I have modified cross-section properties or reduced stiffnesses of a members in RFEM/RSTAB. After a new calculation, the deformation of the structural system has adjusted itself to the new cross-section properties. However, this change is not taken into account when performing design in add-on modules.
In principle, the modified cross-section properties are not transferred into add-on modules, such as RF‑/STEEL or RF‑/STEEL EC3. They are only used for the calculation of internal forces.
In the add-on modules, stresses are calculated using the real cross-section dimensions, which cannot be modified. This would be difficult to implement as many designs require the element width or height and due to the modification, it is not known which parameter has been reduced exactly. This is important for the c/t-designs in RF‑/STEEL EC3, for example.
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