Activating Internal Member Division for Stability Analysis
When analyzing structural elements susceptible to buckling by using the modules RF‑STABILITY (for RFEM) or RSBUCK (for RSTAB), it might be necessary to activate the internal division of members.
If there are, for example, truss members, these are not divided internally. Thus, a global failure shape is determined as the first mode shape in the stability analysis (see the figure on the right). However, when activating the member divisions, it is clear that a local failure of the structure becomes decisive (see the figure on the left). The figure shows the option for activating the division in RF‑STABILITY.
Dipl.-Ing. (FH) Ulrich Lex
Product Engineering & Customer Support
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If a member is laterally supported to prevent buckling due to a compressive axial force, it must be ensured that the lateral support is actually able to prevent buckling.
- What is the critical load factor and how is it possible to determine it?
- How does RF‑STABILITY or RSBUCK determine the buckling load? According to the manual calculation, the respective buckling loads should be about 10% higher.
- Why is it not possible to use result combinations in RF‑STABILITY? It is possible in RSBUCK indeed.
- Is it possible to import effective lengths from RF‑STABILITY or RSBUCK in RF‑/TIMBER Pro?
- Why are the stiffness modifications not taken into account when determining critical load factors in the RF‑STABILITY add-on module?
- What is the meaning of the warning message ER061) Minimum amplifier of design loads <1?
- In RF‑/STEEL EC3, I get an error message saying that the node with a support does not exist in the set of members. What is the reason?
- What is the difference between SHAPE‑THIN 9 and SHAPE‑THIN 8?
- In the RF‑/STEEL EC3 add-on module, I have selected two bracings with the same size as the shear panel type in the "Parameters" window for a beam to be designed. Thus, the beam should be supported laterally in the middle. Why is the eigenvector arbitrary anyhow?
- I am trying to design an open, unsymmetric aluminum cross-section in RF‑/ALUMINUM and I am get the warning "Non-designable - 1022) General cross-section — Check of stability is not available." What is the reason?