1212x
002546
2019-12-02

Question

I have modified cross-section properties or reduced stiffnesses of a member 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.


Answer:

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 exactly which parameter has been reduced. This is important for c/t-designs in RF‑/STEEL EC3, for example.