We provide hints and tips to help you get started with the basic program RFEM.
FAQ 003108 | Why are the stiffness modifications not taken into account when determining critical load factors in the RF‑STABILITY add-on module?
Video
First Steps with RFEM
Question
Why are the stiffness modifications not taken into account when determining critical load factors in the RF‑STABILITY add-on module?Answer
The defined stiffness modifications are only considered in the stability analysis in RF‑STABILITY if the "Activate Stiffness Modifications from RFEM" option under the "Options" section in Window "1.1 General Data" is selected.Keywords
Dlubal FAQ Stiffness Modification Load factor Eigenvalue Frequently Asked Question FAQ about Dlubal Question and Answer about Dlubal
Links
Write Comment...
Write Comment...
Contact us
Do you have any questions about our products or need advice on selecting the products needed for your projects?
Contact us via our free e-mail, chat, or forum support or find various suggested solutions and useful tips on our FAQ page.
![[ZH] CP 001195 | Escalator trusses for commercial complexes in China](/-/media/Images/netgenium/thumbnails/2/9/6/9/0/2969057/2969057.png?la=en-US&mw=348&mlid=778F6A831FED4D2FA656FFF961A20361&hash=2AEC0DB03498BBDDE3B95DC6CA479E37882113F3)
![[CS] CP 001192 | Spiral Staircase with Glass Steps, Zlín, Czech Republic](/-/media/Images/netgenium/thumbnails/2/9/6/6/5/2966590/2966590.png?la=en-US&mw=348&mlid=A3AF70BD148D40BC871A91395A99FC76&hash=F5253F4DA06971854FAC1C54DD6B2CA6CC828FEC)
![[DE] CP 001191 | Diemerstein Valley - Free Form](/-/media/Images/netgenium/thumbnails/2/9/6/6/5/2966566/2966566.png?la=en-US&mw=348&mlid=6C94AB3A02454F7DAD9A460A12CB7058&hash=E83C75041F58152E2A5426F3E8ED0A56C5C3ABEB)
![[DE] CP 001193 | Hobro Arrest Prison Scaffolding, Denmark](/-/media/Images/netgenium/thumbnails/2/9/6/6/6/2966608/2966608.png?la=en-US&mw=348&mlid=009873CC759B413CAB8A477C624F3044&hash=2F048EAABE9F49074C3ADC9738AAC79E2BABFFE6)
![[CS] CP 001194 | Renovation of an Existing Water Tower into an Office Building](/-/media/Images/netgenium/thumbnails/2/9/6/6/6/2966620/2966620.png?la=en-US&mw=348&mlid=2D4F0809D4D4457F82F841389157725E&hash=853209349F7D0FB84CA3FEB5B16C2FDDFD1E4468)
New
In RFEM 5 and RSTAB 8, it is possible to assign nonlinearities to member end releases. In addition to the nonlinearities ‘Fixed if’ and ‘Partial activity’, you can also select ‘Diagram’. If you select the ‘Diagram’ option, you have to specify the according settings for the activity of the member end release. For the individual definition points, it is necessary to specify the abscissa and ordinate values (deformations or rotations and the according internal forces) that define the release.
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.
- Why are the stiffness modifications not taken into account when determining critical load factors in the RF‑STABILITY add-on module?
-
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?
- How are hot -dip galvanized components considered for fire protection in the Steel EC 3 add -on module?
- After the design with RF-/TIMBER Pro, I had a cross-section optimized. Why is the utilization of the optimized cross -section now exceeded?
- Is it possible to design the support pressure or the sleeper pressure in RX-TIMBER?
- Why are the stresses of the 90 ° orientation not displayed in RF-LAMINATE for a layer with the orthotropic direction 90 ° for σb, 90?
- In RF-/STEEL EC3, is the "Elastic design (also for cross-section class 1 and 2)" option under "Details → Ultimate Limit State" considered for the stability analysis when activated?
