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002255
2019-11-12

Buckling Design with RFEM 5

How can I perform a buckling analysis for a surface in RFEM 5?

Answer:

If you want to perform a buckling analysis for surface or shell elements in RFEM 5, the add-on modules RF‑STABILITY, RF‑IMP, and RF‑STEEL Surfaces are required. Proceed as follows:

  • Determine the governing load according to linear static analysis.
  • The results of the governing CO are then used in RF-STABILITY to determine the lowest mode shape (local deflection/buckling of surface).
  • With the result of RF‑STABILITY, you can generate a pre‑deformed structure in RF‑IMP by scaling the mode shape to a maximum ordinate (maximum value of the initial deformation). Define the maximum value of the initial deformation with regard to the model.
  • Copy the governing CO and design it according to the second-order analysis while considering the pre-deformed structure of RF‑IMP.
  • Use the results to perform the stress analysis in RF-STEEL Surfaces.

The attached video shows the general procedure. You can also find some interesting technical articles on this topic on our website.

Cantilever Buckling
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92x
Cantilever - Buckling

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Mode Shape of Cantilever
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Illustration of a method for performing stability analysis according to DIN EN 1992-1-1 in RFEM 6
For reinforced concrete components and structures whose structural behavior is significantly influenced by the second-order effects, Eurocode 2 provides the general method based on a nonlinear determination of internal forces according to the second-order analysis (5.8.6), as well as an approximation method based on the nominal curvature (5.8.8).

The aim of this technical article is to perform a design according to the general design method of Eurocode 2, using the example of a slender reinforced concrete column.
Modell eines Stahlbetonbalkens, der durch Kriechen und Schwinden beeinflusst wird
This technical article addresses the direct deformation analysis of reinforced concrete beams considering the long-term effects of creep and shrinkage. The direct calculation according to Eurocode 2 (EN 1992-1-1, Section 7.4.3) is explained using a single-span beam. Particular emphasis is placed on tension stiffening, behavior in the cracked state based on the distribution factor (damage parameter), and consideration of shrinkage and creep behavior.
Buckling shape of a cantilever as a result of a stability analysis
The Structure Stability add-on is a useful tool when analyzing structural components susceptible to buckling. Using the example of a tapered cantilever beam, the determination of the failure mode and the branching load is shown.
KB 001925 | AISC Fillet Weld Design in RFEM 6
The weld stresses between surfaces can be determined using the Stress-Strain Analysis add-on in RFEM 6. Furthermore, the stress limit determined according to the applicable standard can be input to determine the stress ratio of the weld. This article focuses on the fillet weld design according to AISC 360-22 [1] with two examples from AISC Volume 1: Design Examples [2].
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Feature 002842 | Sign-Dependent Stress Analysis

In the Stress-Strain Analysis add-on, you can use the option to specify sign-dependent limit stresses by stress component.

Feature 002827 | Stresses Within Members

Get a better understanding of the stress distribution within member cross-sections by using clipping planes.

Feature 002720 | Modal Relevance Factor for Stability Analysis

The modal relevance factor (MRF) can help you to assess to which extent specific elements participate in a specific mode shape. The calculation is based on the relative elastic deformation energy of each individual member.

The MRF can be used to distinguish between local and global mode shapes. If multiple individual members show significant MRFs (for example, > 20%), the instability of the entire structure or a substructure is very likely. On the other hand, if the sum of all MRFs for an eigenmode is around 100%, a local stability phenomenon (for example, buckling of a single bar) can be expected.

Furthermore, the MRF can be used to determine critical loads and equivalent buckling lengths of certain members (for example, for stability design). Mode shapes for which a specific member has small MRF values (for example, < 20%) can be neglected in this context.

The MRF is displayed by mode shape in the result table under Stability Analysis → Results by Members → Effective Lengths and Critical Loads.

Feature 002426 | Animation of Deformation

The deformation process of the global deformation components can be represented as a movement sequence.

Frequently Asked Questions (FAQ)
I have to dimension a wall bracket as a steel brackets that I have modeled as surface components in RFEM 5. Which add-on module can I use to design it?

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Why is the effective depth different with the effective depth used in shear checks?

Is it possible to consider shear panels and rotational restraints in the global calculation?

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