Limit Loads in Special Cases

Technical Article

For situations where no design is available, RF-/STEEL EC3 provides the option to neglect the respective internal forces. Examples of such situations are:

  • Bending and compression on angle sections,
  • Multi-axial bending for the design according to General Method,
  • Torsion.

The determination of limit values is the responsibility of the user.

Figure 01 - Determination of Limit Values for Special Cases

The individual filters can be used as follows:

  1. Neglecting bending and design according to Section 6.3.1 (intended axial compression), for example for angle sections.
  2. Similar to 1., but in this case, axial forces are neglected and stability design is performed according to Section 6.3.2 (pure bending).
  3. In the case of sets of members, asymmetrical cross-sections, tapers, or if General Method is selected as a design option in the 'National Annex Settings' dialog box, this can only be used for uniaxial bending and compression, unless otherwise specified. Therefore, a warning message appears in the case of biaxial bending. Thus, this filter can be used to neglect transverse bending. The design is performed according to Section 6.3.4 (General Method).
  4. According to EN 1993-1-1, torsional stress is not considered in stability design. Therefore, a warning message appears in the case of the combination of internal forces and torsion. Using this filter, you can neglect the torsion.

The limit loads for special cases can also be found in other add-on modules such as RF-/STEEL AISC.

If a warning message appears, although none of the internal forces are to be neglected, you can perform the design according to the second-order analysis using the module extension RF-/STEEL Warping Torsion.

Reference

[1] Eurocode 3: Design of steel structures - Part 1-1: General rules and rules for buildings; EN 1993-1-1:2010-12

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