We provide hints and tips to help you get started with the RFEM program.
[DE] Wind simulation using RWIND Simulation and transfer of wind forces to RFEM or RSTAB
First Steps with RFEM
The program RWIND Simulation is a stand-alone program and exists in addition to the structural analysis program RFEM or RSTAB. Due to the basic assumption regarding the determination of wind loads for buildings with transfer of forces into the structural model, there is a native connection between the program RFEM or RSTAB and RWIND Simulation.
This relation allows you to export each RFEM or RSTAB model to the RWIND Simulation program via an interface application with definition of the wind load and to return wind loads to the surfaces of the elements after the calculation. At the same time, the RWIND Simulation program can also be used without RFEM or RSTAB.
Dlubal Knowledge Base RWIND Simulation Wind simulation Wind tunnel Wind flow Wind flow analysis Flow analysis Numerical wind tunnel OpenFOAM Shrink wrap Wind Load Generation Wind simulation software Digital wind tunnel CFD wind simulation program Determination of wind flows Wind effects on the building boundary layer Turbulence Vortex Building shape Current filament Dlubal KB Knowledge Base Technical Contribution
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Models to Download
Surface Model of Wind Pressure Distribution on China Central Television Headquarters Building
Knowledge Base Articles
Digital trends, such as Building Information Modeling (BIM) or new options for creating realistic visualized models, are based on 3D models. But do 3D models really have an advantage or are we just following a trend? The following presents some arguments for working in 3D models.
Product Features Articles
The results of the form‑finding process are a new shape and corresponding inner forces. Usual results such as deformations, forces, stresses, and others can be displayed in the RF‑FORM‑FINDING case.
This prestressed shape is available as the initial state for all other load cases and combinations in the structural analysis.
For more ease when defining load cases, the NURBS transformation can be used (Calculation Parameters / Form‑Finding). This feature moves the original surfaces and cables into the position after form‑finding.
By using the grid points of surfaces or the definition nodes of NURBS surfaces, free loads can be situated on selected parts of the structure.
Frequently Asked Questions (FAQ)
- I often edit the reinforcement provided by the program. Adjusting the reinforcement by using coordinates takes much effort and time if having several beams in the model. Is there any way to speed up the reinforcement editing?
- I design timber components. The deformations of load combinations deviate from the manual calculation exactly by the factor of the material partial safety factor. Why?
- How is an inflatable object simulated in RFEM?
- Which programs can I use to calculate and design power plants?
- How do you define the descriptions of various reinforcement results,such as the required reinforcement?
- Why do I get such a small amount of reinforcement for the upstand beam? The amount of reinforcement for the downstand beams is significantly larger.
In my model, I have to consider construction stages with nonlinearities, so I have to work with the load combinations that are already included in the dead load.
I have several load combinations for the first and then also for the second construction stage to be analyzed and evaluated.
The load combinations from the first construction stage do not occur in the second construction stage.
I am not sure how to assign the load combinations in the construction stages (permanent or temporary).
- How can I run the RX‑TIMBER Frame plugin? I did not find it in the Add-on Modules menu nor in Project Navigator - Data.
- Which filter settings should be selected in the material library for concrete in order to perform design in RF‑CONCRETE according to the Swedish National Annex? In RFEM, there is no Swedish standard group available for the selection.
- I have analyzed two models of an inclined bored pile as a support with defined spring stiffness. A surface that can be moved horizontally (globally) is used for the force transmission. The bored pile in Model A is a support inclined by 15° with a spring stiffness of 2,000 kN/m in the axial direction. The bored pile of Model B is a support with the defined spring stiffnesses, divided into the respective horizontal and vertical components. The value of the spring stiffness is always the same (2,000 kN/m). In my opinion, both models are equivalent. Why are there different results in the deformation anyway?