Manual adjustment of the buckling curve according to EN 1993-1-1

Technical Article on the Topic Structural Analysis Using Dlubal Software

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Technical Article

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.

Flexural buckling curves according to EN 1993-1-1, Table 6.2

The buckling lines in the standard indicate the reduction factor χ to be used, depending on the related slenderness ratio λ ̅. This reduction of the load-bearing capacity takes into account the influence of the geometric and structural imperfections on the component stiffness. These are included in the calculation formula of the reduction factor via imperfection factor α.

The most favorable buckling line a0 represents the least influence of the imperfections and thus provides a higher flexural buckling resistance with the same slenderness. The most unfavorable buckling curve with the largest imperfection factor is buckling curve d.

Imperfection coefficients according to EN 1993-1-1, Table 6.1
buckling curvea0 Image 02 - Selection of a Buckling Curve in the RF-/STEEL EC3 Add-on Module bcd
Imperfection Factor α0.130.210.340.490.76

Manual adjustment in RF-/STEEL EC3

In the input window of the cross-sections, the cross-section details are displayed again in the add-on module. For each cross-section, you can select the buckling curve differently from the database value in the detail settings.

Author

Dipl.-Ing. Oliver Metzkes

Dipl.-Ing. Oliver Metzkes

Product Engineering & Customer Support

Mr. Metzkes is responsible for the development of the add-on modules for steel structures and provides technical support for our customers.

Keywords

Flexural buckling buckling curve Flexural buckling line Stability Imperfections reduction factor

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  • Updated 08/10/2021

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