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2022-03-31

Timber Design | Design of Tapered and Curved Members

Your options in timber design are diverse. You can consider cut-to-grain angles, transverse tension stresses, and volume-dependent radii of curvature for tapered and curved members. To design the area of the grain cut, the strength is adjusted accordingly in the case of bending tension or bending pressure. In order to also allow you to perform a stability analysis with the equivalent member method, the height to determine the effective and lateral-torsional buckling lengths is set at a distance of 0.65 × h to the actual design point.

A wooden tapered girder showcasing its geometric properties and structural design.
Tapered Timber Girder
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Knowledge Base Articles
Experimental Wind Tunnel Test – Aachen University
Validating CFD simulations with experimental data enhances accuracy by comparing simulation outcomes with real-world conditions. This process identifies discrepancies, allowing adjustments to enhance model reliability. Ultimately, it builds confidence in the simulation's ability to predict wind load scenarios.
KB 001870 | Static Analysis with Wind Loads from Experimentally Measured Pressures Using RWIND 2 and RFEM 6
When wind-induced surface pressures on a building are available, they can be applied on a structural model in RFEM 6, processed by RWIND 2, and used as wind loads for static analysis in RFEM 6.
KB 001871 | Interpolation Methods for Experimentally Measured Pressures in RWIND 2
RWIND 2 and RFEM 6 can now be used to calculate wind loads from experimentally measured wind pressures on surfaces. Basically, two interpolation methods are available to distribute pressures measured in isolated points across the surfaces. The desired pressure distribution can be achieved using the appropriate method and parameter settings.
Validation Example Model
Creating a validation example for Computational Fluid Dynamics (CFD) is a critical step in ensuring the accuracy and reliability of simulation results. This process involves comparing the outcomes of CFD simulations with experimental or analytical data from real-world scenarios. The objective is to establish that the CFD model can faithfully replicate the physical phenomena it is intended to simulate.
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Product Features
Feature 002819 | Flow Field Quantities

In RFEM and RSTAB, you can visualize the flow field quantities of pressure, velocity, turbulence kinetic energy, and turbulence dissipation rate for the wind simulation.

The clipping planes are aligned with the respective wind direction.

Feature 002746 | Application of Wind Loads from Experimentally Determined Pressure Values

If you have experimentally determined surface pressures available for a model, you can apply them to a structural model in RFEM 6, process them in RWIND 2, and use them as wind loads in the structural analysis of RFEM 6.

You can find out how to apply the experimentally determined values in this Knowledge Base article: Static Analysis with Wind Loads from Experimentally Measured Pressures Using RWIND 2 and RFEM 6

Feature 002649 | Displaying RWIND Results Directly in RFEM 6

You can display the RWIND results directly in the main program. In the Navigator - Results, select the Wind Simulation Analysis result type from the list above.

Currently, the following results are available, which refer to the RWIND computational mesh:

  • Surface pressure
  • Surface cp coefficient
  • Wall distance y+ (steady flow)
Go to Explanatory Video
Feature 002554 | Editor for Mesh Refinement Control

Do you already know the editor for mesh refinement control? It is a great help for your work! Why? It's easy – it gives you the following options:

  • Graphic visualization of the areas with mesh refinements
  • Mesh refinement of zones
  • Deactivating the standard 3D solid mesh refinement with transversion into the corresponding manual 3D mesh refinements.

These options help you to formulate a suitable rule for meshing the entire model, even for the models with unusual dimensions. Use the editor to efficiently define small model details on large buildings or detailed meshing areas in the coating area of the model. You will be amazed!

Frequently Asked Questions (FAQ)

How can I find RWIND results such as forces data in ParaView?

How can I obtain wind force coefficient in RWIND?
My results of the line probe in RWIND seem implausible. Why?
My results in RWIND have changed or seem implausible. Why?
Computational Fluid Dynamics (CFD) is a powerful tool in modern engineering practice. However, as with all simulation methods, the question arises: how reliable are the results?
When importing a model to RWIND, I get a message about overlapping triangles. What should I pay attention to?
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