Which result combinations can I design with the RF‑/JOINTS Pro program and what should I pay attention to?

Answer

The RF-/JOINTS add-on module is divided into several joint groups. For this, see the following FAQ.
Therefore, there is no straightforward answer to the special aspects of the design as in this FAQ.

In contrast to the RF‑/TIMBER Pro add-on module described in the mentioned FAQ, however, it is obvious that the RF‑/JOINTS add-on modules cannot design EC2, even if manually changing the LDC, for example in the RF‑/JOINTS Timber - Steel to Timber add-on module (see Figure 01).

Furthermore, this also applies to the add‑on modules RF‑GLASS and RF‑/CONCRETE NL.

The reason for this is that there are stiffnesses exported in the program in the case of some joint groups of the RF‑/JOINTS add‑on module. For nonlinear calculations, the superposition with result combinations is not allowed. In the case of the second result combination mentioned above, there is the special feature that the superposition is no longer conservative, even in the case of simple structures. The design cannot be also performed correctly by manually changing the LDC.

Nevertheless, if a result combination should be superimposed with constant and alternative additive, it is necessary to split EC2 in the attached file into load combinations as follows.

  • CO1=LC2
  • CO2=LC1+LC2
  • RC2*=CO1 or CO2


Keywords

Superposition Stiffness LDC

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