We provide hints and tips to help you get started with the basic program RFEM.
Design of Steel and Membrane Structures | RFEM | Info Day Online | 15.12.2020 | 1/4
Video
First Steps with RFEM
Description
In the first part of the Dlubal Info Day Online recording, Andreas Niemeier shows how to model and design a tennis court roof.
The following topics are included:
- Tennis court roof modeling
- Loads
- Wind load generation based on CFD
- Load case combinations
- Stability analysis
- Generation of imperfections
- Member and surface components design
Keywords
Tennis court roof Steel structures Eurocode 3 Membrane structure Membrane surface Wind loads of curved roofs CFD simulation RF-LIMITS Limits
Links
- Software for Form-Finding and Cutting Patterns of Membrane Structures
- Software for Wind Simulation & Wind Load Generation on Structures
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![[ZH] CP 001195 | Escalator trusses for commercial complexes in China](/-/media/Images/netgenium/thumbnails/2/9/6/9/0/2969057/2969057.png?la=en&mw=348&mlid=778F6A831FED4D2FA656FFF961A20361&hash=9EBB4DACB9DBE807C4A4A63A03C40211819DA585)
Cutting Pattern of Membranes and Cable Elements
Cable and tensile membrane structures are regarded as very slender and aesthetic building constructions. The partly very complex double-curved shapes can be found using suitable form-finding algorithms. A possible solution is, for example, to search the form via the equilibrium between the surface stress (provided prestress and an additional load such as self-weight, pressure, etc.) and the given boundary conditions.
![Distribution of Forces and Moments in Column Base According to [1]](/-/media/Images/website/img/000001-010000/009601-009700/009638.png?la=en&mlid=7D34CEAAE7354583A29169095622B515&hash=D5A1CD829CEAC6F92DF0C68F3F0F37A7E0C0E89B)
![System and Loading According to [1]](/-/media/Images/website/img/000001-010000/009601-009700/009634.png?la=en&mlid=F0F0A23924B8424CA1C2905961DF676B&hash=6AC023A421BDDF6BFE2AC5D69132D2F81A0C365A)
Display of Topology on Deformed Structure
With the activated option "Topology on form-finding shape" in the Project Navigator - Display, the model display is optimized based on the form-finding geometry. For example, the loads are displayed in relation to the deformed system.
- Are the models and presentations from Info Day 2020 freely available, and can you send them to me?
- I get the error "The stiffness matrix is singular!" for a calculation in RF‑FORM‑FINDING, what can I do?
- How do I get the actual member length of cables, for example, after the calculation in RF‑FORM‑FINDING?
- How is it possible to create the cutting pattern geometry for a decorative sticker on a biaxially curved membrane roof?
- How are the properties of the elasticity and shear modulus of a membrane fabric with the usual force/length syntax transformed into the general force/surface syntax to be entered in RFEM?
- Why is the membrane constricted so much during the form-finding? I obtain very large deformation values.
- When modeling a building, there is a location where I have a wall on a ceiling that is not supported underneath. What are the modeling options for this?
- How are riggings processed in RF‑FORM‑FINDING, concerning the prestress load to be applied. Is it necessary to assign a prestressing force to the riggings?
- How do I model a tent roof with two cone tips?
- Why do I get large differences for the design of a longitudinally stiffened buckling panel in comparison with the German and Austrian National Annex?
