In the case of a funnel-shaped component, you can use, for example, a polygonal contact solid layout (A), but this would result in the incorrect secondary effect of stress peaks at corner points. When modeling using members (B), these should be arranged at each FE mesh point, and the cross‑section should correspond approximately to the FE mesh width. You can implement the failure criterion by member type (for example, compression member) or by means of nonlinear member releases.
Contact Problem at Funnel-Shaped Component
Contact solids can be created between two flat surfaces or between two cylindrical shells. However, if the area of the contact problem is a little more complicated, it is necessary either to simplify the system so that the requirements of a contact solid can be met, or to go back to the "old" modeling style using a rod model.
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Mr. Fröhlich provides technical support to our customers and is responsible for development in the area of reinforced concrete structures.
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This article provides a comprehensive overview of essential seismic analysis methods, explaining their principles and applications, as well as the scenarios in which they are most effective
Flexural buckling analysis is a combination of stability analysis and ultimate limit state design that has been used in steel structures for hundreds of years. The critical buckling load is the starting point here for considering the stability problem, but no design has yet been performed without considering imperfections. How exactly are these imperfections determined?
To be able to evaluate the influence of local stability phenomena of slender structural components, RFEM 6 and RSTAB 9 provide you with the option of performing a linear critical load analysis on the cross-section level. The following article explains the basics of the calculation and the result interpretation.
When a concrete slab is set upon the top flange, its effect is like a lateral support (composite construction), preventing problems of torsional buckling stability. If there is a negative distribution of the bending moment, the bottom flange is subjected to compression and the top flange is under tension. If the lateral support provided by the stiffness of the web is insufficient, the angle between the bottom flange and the web intersection line is variable, so there is a possibility of distortional buckling of the bottom flange.
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In the "Edit Section" dialog box, you can display the buckling shapes of the Finite Strip Method (FSM) as a 3D graphic.
In the Steel Design add-on, you can perform the stability and cross-section design checks of cold-formed sections according to EN 1993‑1‑3 in compliance with Sections 6.1.2 – 6.1.5 and 6.1.8 – 6.1.10.
Go to Explanatory Video
The design of cold-formed steel members according to the AISI S100-16 / CSA S136-16 is available in RFEM 6. Design can be accessed by selecting “AISC 360” or “CSA S16” as the standard in the Steel Design Add-on. “AISI S100” or “CSA S136” is then automatically selected for the cold-formed design.
RFEM applies the Direct Strength Method (DSM) to calculate the elastic buckling load of the member. The Direct Strength Method offers two types of solutions, numerical (Finite Strip Method) and analytical (Specification). The FSM signature curve and buckling shapes can be viewed under Sections.
Would you like to perform cross-section design checks for cold-formed steel members according to EN 1993‑1‑3? No matter if you design the cold-formed sections from the cross-section library or the general cold-formed (non-perforated) sections from RSECTION – your structural analysis program helps you to determine the effective cross-section, taking into account the local buckling and instability. You can also perform a cross-section check according to EN 1993‑1‑3, 6.1.6. In this case, the internal forces from the calculation using Torsional Warping (7 DOF) are taken into account by means of the equivalent stress check
Go to Explanatory VideoIs it possible to consider shear panels and rotational restraints in the global calculation?
How can I perform member design by case for different settings in the design configuration?
How can I reduce the calculation time for members with a nonlinear material model in RFEM 6 and RSTAB 9?
How do I define a plastic hinge in RFEM 6?
How can I exchange data between RFEM 6 / RSTAB 9 and IDEA StatiCa?
How can I generate an area load on members via cells in RFEM 6 or RSTAB 9?
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