We provide hints and tips to help you get started with the basic program RFEM.
FAQ 002771 | How do you consider an offset of members at a particular connection point?
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First Steps with RFEM
Question
How do you consider an offset of members at a particular connection point?Answer
There are basically two options:
- The use of Stabexzentrizitäten, see Fachbeitrag consideration of beam and Flächenexzentrizitäten
- In the case of differently defined member end hinges in combination with different dimensions of offsets, the use of couplings or rigid members can help, see Figure 1 - Solid model and Figure 2 - Wireframe model
Image 02 - Offset by means of rigid members - wireframe model
Keywords
Dlubal FAQ eccentricity member eccentricity offset eccentric member end hinge connection Frequently Asked Question FAQ about Dlubal Question and Answer about Dlubal
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Often, models are needed in several projects, like the purlin with columns and knee braces in this example. The dimensions can be changed directly in RFEM or RSTAB by shifting the nodes.
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.
- I would expect the results from my load combination (CO) set to a linear analysis to equal the summation of the results from my load cases (LC) also set to a linear analysis. Why do the results not match?
- A rigid member should only be able to absorb tensile forces or only compressive forces. What are the options for considering these nonlinearities in the calculation?
- How do I display the nodal displacements graphically?
- How does the activation of the precamber imperfection work?
- Are the models and presentations from Info Day 2020 freely available, and can you send them to me?
- Why do I obtain great differences in results for both the deformation and the bending moments when applying inclination by using imperfection to a single member and an articulated set of members with the same total length?
- Are the models and presentations from Info Day 2017 freely available, and can you send them to me?
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When trying to import a model from AutoCAD into RFEM, I am getting the error message "3DSOLID or REGION entity detected. Those entities are written in binary format, so import is not possible."
What does this mean? - Is it possible to perform automatic live load reduction in RFEM or RSTAB per the ASCE, IBC, or NBCC?
- Is the Gust-effect (G or Gf) from the ASCE 7-16 Sect. 26.11 considered in RWIND Simulation?
