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2015-08-03

Structure Stability | Calculation

You can select several methods that are available for the eigenvalue analysis:

  • Lanczos (RFEM)
  • Roots of Characteristic Polynomial (RFEM)
  • Subspace Iteration Method (RFEM/RSTAB)
  • Shifted Inverse Iteration (RSTAB)

Use the Structure Stability add-on to perform a nonlinear stability analysis using the incremental method. This analysis also provides realistic results for nonlinear systems.

The critical load factor is determined by gradually increasing the loads of the underlying load case until the instability is reached. The load increment takes into account nonlinearities such as failing members, supports and foundations, and material nonlinearities. After increasing the load, you can optionally perform a linear stability analysis on the last stable state in order to determine the stability mode.

Eigenvalue Method
Eigenvalue Method
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Knowledge Base Articles
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].
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.
KB 001911 | Torsional Analysis According to AISC DG 9 with 7 DOF Add-on
According to AISC Design Guide 9 Section 4.1 [1], the following torsional stresses must be considered for open cross-sections subjected to warping:
KB 001848 | Timber Column Design as per 2018 NDS Standard in RFEM 6
Using the Timber Design add-on, timber column design is possible according to the 2018 NDS standard ASD method. Accurately calculating timber member compressive capacity and adjustment factors is important for safety considerations and design. The following article will verify the maximum critical buckling strength calculated by the Timber Design add-on using step-by-step analytical equations as per the NDS 2018 standard including the compressive adjustment factors, adjusted compressive design value, and final design ratio.
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Product Features
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 002426 | Animation of Deformation

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

Feature 002423 | Displaying Results in Solids

The results of solid stresses can be displayed as colored 3D points in the finite elements.

Frequently Asked Questions (FAQ)
Why are the stresses of the structural analysis different from those calculated with the Stress-Strain Analysis add-on?
The limit stress is activated, but my stress ratio is “non-designable” in the Stress-Strain Analysis add-on. What could be the reason?
Is it possible to display the deformation analysis of a surface (limit 0.5‰)?
Is it possible to perform stability analysis according to EN 1999‑1‑1 in RSECTION 1?
Is it possible to perform stability analysis according to EN 1993‑1‑1 in RSECTION 1?
Is it possible to consider the eccentricity of unsymmetrical line welds for the stress analysis in RFEM 6?
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