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Stability Analysis of Structures
Solutions for Stability Analysis
Recommended Products for Stability Analysis
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Entrance Structure "Mitoseum" in Dinosaur Park Kleinwelka
The reception building in Dinosaur Park Kleinwelka near Bautzen, Germany has a total height of 22 m (72 ft) and resembles mitosis. Mitosis is a type of cell division and the origin of life. The bionic structure consists of a total of 1,389 tubular steel members, each of which is connected in 269 nodes.
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Project Location
Kleinwelka, Germany
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Software
RSTAB, RSTAB 8, RSBUCK 8
More About Customer Project
© zapf & co., Michael Moser Images
Outdated Products
RFEM 5 | FEA Structural Analysis Software
The structural analysis program RFEM provides structural engineers with a 3D FEA program that meets all the requirements of modern civil engineering. Efficient data input and intuitive handling facilitate the modeling of simple and complex structures.
The add-on modules for stability analysis in RFEM 5 are:
RF-/PLATE-BUCKLING | RFEM/RSTAB Add-on Module or Stand-Alone Program
RF-/PLATE-BUCKLING performs plate buckling analysis of rectangular plates according to EN 993‑1‑5:2006 or DIN 18800‑3:1990‑11. The plates can have horizontal or vertical stiffeners (flat steel, angles, T-stiffeners, trapezoidal sections, channels).
RSTAB 8 | Structural Frame and Truss Analysis Software
RSTAB is a powerful analysis and design software for 3D beam, frame, or truss structure calculations, reflecting the current state of the art and helping structural engineers meet requirements in modern civil engineering.
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This article will show you how to use the Torsion Warping (7 DOF) add-on in combination with the Structure Stability add-on to consider cross-section warping as an additional degree of freedom when performing the 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.
In this article, we will explore the various types of stability failures, delving into their key features, causes, and how they manifest in different structural systems.
The modal relevance factor is a result of the linear stability analysis and qualitatively describes the degree of participation of individual members in a specific mode shape.
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.
Compared to the RF-/STABILITY (RFEM 5) and RSBUCK (RSTAB 8) add-on modules, the following new features have been added to the Structure Stability add-on for RFEM 6 / RSTAB 9:
- Activation as a property of a load case or load combination
- Automated activation of the stability calculation via combination wizards for several load situations in one step
- Incremental load increase with user-defined termination criteria
- Modification of the mode shape normalization without recalculation
- Result tables with filter option
- Calculation of models consisting of member, shell, and solid elements
- Nonlinear stability analysis
- Optional consideration of axial forces from initial prestress
- Several equation solvers for an efficient calculation of various structural models
- Optional consideration of stiffness modifications via structure modification settings
- Determination of a stability mode greater than the user-defined load increment factor (Shift method)
- Optional determination of the mode shapes of unstable models (to identify the cause of instability)
- Visualization of the stability mode
- Basis for determining imperfection
Due to the integrated RF-/STEEL Warping Torsion module extension, it is possible to perform the design according to Design Guide 9 in RF-/STEEL AISC.
The calculation is performed with 7 degrees of freedom according to the warping torsion theory and enables a realistic stability design, including consideration of torsion.
Is it possible to consider shear panels and rotational restraints in the global calculation?
The lateral torsional buckling (LTB) check looks missing in the Steel Design. What could be the reason?
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 use the General Method according to EN 1993‑1‑1, 6.3.4 to design structural components with an asymmetric cross-section in the Steel Design add-on for RFEM 6 or RSTAB 9?
In the Steel Design add-on, I have set the boundary conditions in such a way that the I-beam flange is restrained against the horizontal displacement. I then calculated the critical load factors using the Structure Stability add-on, but with no effect on the critical load factor value. What is the reason for this?
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