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FAQ 003240 | How can I connect side-by-side sections to obtain a coherent cross-section?
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First Steps with RFEM
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How can I connect side-by-side sections to obtain a coherent cross-section?Answer
In SHAPE-THIN, you have the option to connect independent cross-section parts by using so-called null elements. Thus, you get a total cross-section and can also use it for the design in RSTAB or RFEM.
dummy elements
It is necessary to assign a thickness t to each element. This value is the actual thickness of the cross-section part for the full transfer of the normal actions. Furthermore, the effective thickness t* controls the shear transfer for "artificial" coupling elements with the thickness of t = 0. These null elements are used to create a shear connection between two elements that do not have a common node. The definition of a shear thickness t* > 0 is required for those null elements that have no contact to normal elements (t > 0) along their entire lengths.
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Dlubal FAQ Connecting cross-section parts Gross cross-section Null elements Frequently Asked Question FAQ about Dlubal Question and Answer about Dlubal
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Manual adjustment of the buckling curve according to EN 1993-1-1
The RF-/STEEL EC3 add-on module automatically transfers the buckling line to be used for the flexural buckling analysis for a cross-section from the cross-section properties. In particular for general cross -sections, but also for special cases, the assignment of the buckling line can be adjusted manually in the module input.
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SHAPE-THIN | Cold-Formed Sections
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.
- Are the models and presentations from Info Day 2017 freely available, and can you send them to me?
- Is it possible to use a cross-section from SHAPE‑THIN 9 in older versions of RFEM or RSTAB?
- Are the models and presentations from Info Day 2015 freely available, and can you send them to me?
- Can I display negative shear stresses in SHAPE‑THIN?
- How can I connect side-by-side sections to obtain a coherent cross-section?
- Why do I get high differences when designing a longitudinally stiffened buckling panel compared to the German and Austrian National Annexes?
- How can I perform the stability analysis for an edgewise supported flat steel, for example 100/5, in RF-/STEEL EC3? Although the cross-section is rotated by 90 ° in RFEM/RSTAB, it is displayed lying flat in RF-/STEEL EC3.
- How can I create a curved or curved section?
- How are the signs to be interpreted for the release results of the line release and line hinges?
- How is the rotational stiffness of a buckling stiffener determined in FE-BUCKLING?
