FAQ 002565 EN-US
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The member boundary conditions have a decisive influence on the ideal critical moment for lateral-torsional buckling Mcr. The program uses a planar model with four degrees of freedom for the determination. The corresponding coefficients kz and kw can be defined individually for standard -compliant cross -sections. This allows you to describe the degrees of freedom that are available at both member ends due to the support conditions.
- 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?
- How is the rotational restraint stiffness calculated for a non-continuous rotational restraint (for example, purlins) in RF‑/STEEL EC3?
- 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?
- Why are the equivalent member designs grayed out in the Stability tab when activating the plastic designs by using the partial internal force method (RF‑/STEEL Plasticity)?
- For cross-section design of a flat steel, I obtain abnormally high shear stresses due to the torsion in the STEEL EC3 add-on module, which can be disproved by a simple manual calculation. What is the error?
- When calculating a cable using the STEEL EC3 add‑on module, there is the error message "Incorrect characteristic stresses for material No. 1! Please correct this in Table 1.2."
- Are effective length factors determined automatically from a model in the add-on modules for the aluminum and steel design or do I have to make adjustments?
- I get the message "Existing torsion -> no stability design possible." Why does this appear and what can I do?
- I design an asymmetric cross-section and get the message: "Non-designable: ER051) Moment about z‑axis on asymmetric cross-section, taper or set of members." Why?
- How can I perform the stability analysis in RF‑/STEEL EC3 for a flat bar supported on edges, such as 100/5? Although the cross-section is rotated by 90° in RFEM/RSTAB, it is displayed as lying flat in RF‑/STEEL EC3.