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Dipl.-Ing. (FH) Gerhard Rehm
2019-04-10

Calculation of Double Rectangular Cross-Sections in TIMBER Pro

I cannot calculate members with double rectangular cross-sections and linearly variable cross-section height in TIMBER Pro. What can be the cause?

Answer:

In the RF‑/TIMBER Pro add-on module, you can design double rectangular cross-sections ("H‑2B" cross-section) with a constant cross-section height over the member length. Tapered H‑2B cross-sections are excluded from the design.

In this case, it is useful to display the H‑2B cross-section using two separate rectangular cross-sections. You can either model the two members geometrically separately and couple them with rigid members, for example, or you can activate the "Allow double members" option in the "Edit" menu and assign the corresponding eccentricities to the two members, which initially lie on top of each other. These members can then be designed in RF‑/TIMBER Pro.

Under "Downloads" below, you can find an example file.

Double Rectangular Cross-Section and Modeling Options
Double Rectangular Cross-Section and Modeling Options
Author

Mr. Rehm is responsible for developing products for timber structures, and he provides technical support for customers.

Downloads
Model File | Variants for Modeling Tapered Members with Double Rectangular Cross-Section
520 KB
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Models to Download
Knowledge Base Articles
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This article describes and explains the influence of bending stiffness of cables on their internal forces. Furthermore, the text provides information on how this influence can be reduced.
KB 001848 | Timber Column Design as per 2018 NDS Standard in RFEM 6
Using the Timber Design add-on, timber column design is possible according to the 2018 NDS standard ASD method. Accurately calculating timber member compressive capacity and adjustment factors is important for safety considerations and design. The following article will verify the maximum critical buckling strength calculated by the Timber Design add-on using step-by-step analytical equations as per the NDS 2018 standard including the compressive adjustment factors, adjusted compressive design value, and final design ratio.
Conversion to Parametric Section
Rolled sections, the most common cross‑section type in RFEM and RSTAB, can also have user‑defined parameters. To do this, select the cross‑section to be modified in the cross‑section library and click the [Parametric Input...] button.
Timber Beam-Column
In this article, the adequacy of a 2x4 dimension lumber subject to combined biaxial bending and axial compression is verified using the RF-/TIMBER AWC add-on module. The beam-column properties and loading are based on example E1.8 of AWC Structural Wood Design Examples 2015/2018.
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Product Features
Export RFEM or RSTAB Models to *.glb or *.glTF Format

RFEM and RSTAB models can be saved as 3D glTF models (*.glb and *.glTF formats). View the models in 3D in detail with a 3D viewer from Google or Babylon. Take your VR glasses, such as Oculus, to "walk" through the structure.

You can integrate the 3D glTF models into your own websites using JavaScript according to the instructions (as on the Dlubal website Models to Download): "Easily display interactive 3D models on the web & in AR" .

Activation of Camera Flight Mode in RFEM

With the Camera Fly Mode view option, you can fly through your RFEM and RSTAB structure. Control the direction and speed of the flight with your keyboard. Additionally, you can save the flight through your structure as a video.

"Update only Materials, Thicknesses, and Cross-Sections" Export Option

The direct interface with Revit allows you to update the Revit model according to the changes you have made in RFEM or RSTAB. Depending on the modification, the Revit objects may have to be regenerated (deleting the object and subsequent regeneration). The regeneration is performed on the basis of the RFEM/RSTAB model.

If you want to avoid this regeneration, activate the check box 'Update only materials, thicknesses, and sections'. In this case, only the properties of the objects will be adjusted. Changes different from those in material, surface thickness, and section are, however, not considered in this case.

Transfer of Reinforcement from RFEM/RSTAB (Top) to Revit (Bottom)

The reinforcement proposal from RF-/CONCRETE Members can be exported to Revit. The rectangular and circular cross-sections are currently supported.

The reinforcement bars can be modified retroactively in Revit.

Frequently Asked Questions (FAQ)

Where can I find the update reports for RFEM 5, RSTAB 8, SHAPE-THIN, SHAPE-MASSIVE, RX-TIMBER, CRANEWAY, PLATE-BUCKLING, COMPOSITE-BEAM?

For my NVIDIA graphics card, I need to select between a driver from the "Production Branch" and a "New Feature Branch." Which driver is best suited for RFEM/RSTAB?
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Can I display node coordinates in my model?
Can I use SHAPE-THIN 9 in combination with RSTAB 8?
Has the RF-TOWER add-on module for RFEM 5 already been added to RFEM 6?
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