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KB 001626 | Steel Frame Considering Connection Stiffness
First Steps with RFEM
This technical article analyzes the effects of the connection stiffness on the determination of internal forces as well as the design of connections using the example of a two-story, double-spanned steel frame.
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Models to Download
Knowledge Base Articles
Standard Roller Support (1:1 RFEM Modeling Ratio According to Workshop Drawings; © Rümmele Bauingenieur GmbH)
Product Features Articles
SHAPE-THIN determines the effective cross-sections according to EN 1993-1-3 and EN 1993-1-5 for cold-formed sections. You can optionally check the geometric conditions for the applicability of the standard specified in EN 1993‑1‑3, Section 5.2.
The effects of local plate buckling are considered according to the method of reduced widths and the possible buckling of stiffeners (instability) is considered for stiffened sections according to EN 1993-1-3, Section 5.5.
As an option, you can perform an iterative calculation to optimize the effective cross-section.
You can display the effective cross-sections graphically.
Read more about designing cold-formed sections with SHAPE-THIN and RF-/STEEL Cold-Formed Sections in this technical article: Design of a Thin-Walled, Cold-Formed C-Section According to EN 1993-1-3.
Frequently Asked Questions (FAQ)
- For a tapered member, I get the error message "Invalid (incompatible) arrangement ...". What can I do?
- I have defined a wind profile for RWIND Simulation up to a height of 100 m. Is the wind profile dependent on the size of the wind tunnel?
- As part of my bachelor thesis, I would like to integrate the RSTAB printout report into LaTeX. There, you can completely integrate a PDF document as shown in the viewer. This also works with any PDF document, but not with the printout report created by RSTAB. What could be the reason?
- Does the program use different values of modulus of elasticity for different temperatures? How to activate it?
- How can I set the deformation coefficient kdef in the program?
- I would like to design an aluminum or lightweight structure. Is it possible to use RFEM or RSTAB for this?
- I am using COM interface and Grasshopper for the calculation of complicated structures. For this task I need to create NURBS lines. Could you explain how NURBS should be set? For example what kind of data should be provided for Knots?
- I would like to move some elements. When moving, my members are deleted, what is the reason?
- I cannot find any reason why no plastic design is performed for a class 1 cross-section. Normally, you have to select the check box for the elastic design.
- How do I activate the modeling of pipelines?