- The European lateral-torsional buckling curve, regulated in the German National Annex to EN 1993, for example.
- The adaptation for biaxial bending according to a dissertation by Naumes.
- The interpolation between lateral buckling and lateral-torsional buckling.
Design of Sets of Members According to Eurocode 3
I cannot define effective lengths for the design of a set of members in STEEL EC3. Am I doing something wrong?
Answer:
In addition to the stability analysis in Section 6.3.1 through 6.3.3 of EN 1993‑1‑1 (Equivalent Member Method), the RF‑/STEEL EC3 add-on module provides the General Method according to Section 6.3.4 of EN 1993‑1‑1. The latter can be extended with the following options:
When designing sets of members according to the General Method, a window is available in Window "1.7 Nodal Supports – Sets of Members" where the nodal supports are displayed graphically on the set of members. This way, the General Method is a useful supplement to other design methods. It 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 Image 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. Therefore, use the preset General Method for members with a variable cross-section.
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Mr. Baumgärtel provides technical support for Dlubal Software customers.
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Very small torsional moments in the members to be designed often prevent certain design formats. In order to neglect them and still perform the designs, you can define a limit value in RF‑/STEEL EC3 from which torsional shear stresses are taken into account.
The RF‑/STEEL EC3 add-on module automatically transfers the buckling line to be used for the flexural buckling analysis for a cross-section from the cross-section properties. The assignment of the buckling line can be adjusted manually in the module input for general cross-sections in particular, as well as for special cases.
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