For the design of a set of members in STEEL EC3, I cannot define effective lengths. Am I doing something wrong?

Answer

In addition to the stability analysis in Sections 6.3.1 to Section 6.3.3 of EN 1993‑1‑1 (Equivalent Member Method), RF‑/STEEL EC3 also provides the General Method according to Section 6.3.4 of EN 1993‑1‑1.

This can be extended with the following options:
~ The European lateral-torsional buckling curve, which is regulated in the German National Annex to EN 1993, for example.
~ Extension of biaxial bending according to the dissertation by Dr. Naumes.
~ The interpolation between lateral buckling and lateral-torsional buckling.

When designing sets of members according to the General Method, a window is available in the Window "1.7 Nodal Supports - Sets of Members" where the nodal supports are displayed graphically on the set of members. In this way, the General Method represents a useful supplement to the other design methods, which has proven itself, particularly when designing tapers. It is not necessary to enter effective lengths in this method.

In the "Details" of the add-on module, you can select the method to be used for sets of members in the "Stability" tab (see Figure 01).

The equivalent member method may only be used for straight sets of members with a uniform cross-section (that is, not for tapered joints). For members with a variable cross-section, use the preset General Method.

Keywords

Effective length General method Equivalent member method Set of members

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RFEM Steel and Aluminium Structures
RF-STEEL EC3 5.xx

Add-on Module

Design of steel members according to Eurocode 3

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RSTAB Steel and Aluminium Structures
STEEL EC3 8.xx

Add-on Module

Design of steel members according to Eurocode 3

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1,480.00 USD