#### Further Information

In addition to our technical support (e.g. via chat), you’ll find resources on our website that may help you with your design using Dlubal Software.

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New FAQ 004218 EN

Basically, all cross-sections of the solid and hybrid cross-section groups can be designed in the RF-/TIMBER Pro program. In Figure 01, they are shown on the right.

For more complex unsymmetric cross-section shapes, it may be necessary to adjust the allowable principal axis angle in the add-on module on a user-defined basis (see Figure 02).

• ### What is the meaning of 'Shear Failure in Glued Contact Surface' in the details of the RF-LAMINATE add-on module?

New FAQ 004206 EN

In the case of cross laminated timber panels not glued to the narrow sides and a wall-like structural behaviour, the torsion stress in the glued joints is often decisive. This design is performed according to the explanations in the literature reference below according to the following equation.

$\eta_x=\frac{\tau_{tor,x}}{f_{v,tor}}+\frac{\tau_x+\tau_{xz}}{f_R}=\frac{\displaystyle\frac{3\ast n_{xy}}{b(n-1)}}{f_{v,tor}}+\frac{{\displaystyle\frac{\frac{\partial n_x}{\partial x}}{n-1}}+\tau_{xz}}{f_R}\leq1$

Values:
• b board width
• n number of board layers
• nxy shear in pane plane
• $\frac{\partial n_x}{\partial x}$ shear of board layers
• $\tau_{xz}$ shear in thickness direction
• fR rolling shear strength
• fv,tor torsion shear resistance
For the y-direction, the design is analogous but with the values for the y-direction.
• ### Is it possible to save a file in a previous version of RSTAB 8 or RFEM 5?

New FAQ 004203 EN

No, this is unfortunately not possible.

If you save the last version of your model in RSTAB or RFEM, it is done in the currently used version.

However, you can also open RSTAB 8 files in RSTAB 7 and RSTAB 5 files in RFEM 4. Please pay attention to the notes in FAQ004112 in the link below.
• ### What is the note 40162 saying regarding the shear strengths of Binderholz company?

New FAQ 004191 EN

For the superstructures of the manufacturer Binderholz, as soon as the slabs are defined without glue at narrow sides and design of shear failure is calculated in the wall plane, the shear strengths are calculated according to the following equation.

$f_{v,k}=\left\{\begin{array}{l}\begin{array}{c}3,5\\8,0\frac{D_{net}}D\\\end{array}\\2,5\frac{(n-1)(a²+b²)}{6Db}\end{array}\right.$

Values:
D element thickness
Dnet sum of longitudinal and transverse layer thicknesses in the element
n number of board layers
a = b width of the boards in the longitudinal or transverse layers

All values in N/mm². For more detailed information, check the manufacturer's approval.
• ### Which hardware and system requirements exist for the program RWIND Simulation?

New FAQ 004176 EN

The minimum computer configuration for RWIND Simulation is as folllows:

• Working Memory (RAM): 4 GB
• Processor CPU: x64
• Free mass storage: 10 GB
• Screen and graphics card resolution: 1280 x 800 px
• Operating system: Microsoft Windows 10 64-bit
To use all program capacities, the following computer configuration is recommended:

• Working Memory (RAM): 64 GB
• Processor CPU: Intel Core i9-9900K with 8 physical cores or better.
The number of cores has a positive effect on the calculation time and the respective single core power on the pure program operation and preparation of the graphics data.
• Free mass storage: 100 GB
• Graphics card: A modern ATI or NVIDIA graphics card with OpenGL support (for example, NVIDIA GeForce RTX 2070 or better).
The built-in GPU is not affected by the calculation.
• Screen resolution: 1920x1200 px
• Operating system: Microsoft Windows 10 64-bit

• ### I have the stiffnesses of my members numerically. How can I assign the stiffnesses to a member without having to create a virtual material and a cross-section?

New FAQ 004142 EN

In this case, there is the member type called 'Stiffnesses', and the member stiffnesses can be specified directly in a dialog box that you open with the  button. Thus, the assignment of a cross-section is unnecessary.
• ### I have the problem with my Dlubal programs that umlauts and special characters cannot be displayed. How to change it?

New FAQ 004140 EN

In our programs, we use the fonts of the operating system.

It is necessary to change the region in the Control Panel of the operating system. Then, restart the computer. The texts should then be displayed correctly.

• ### Using the 'Import Support Reactions as Load' function, I get the message 'No surface has been selected upon which the load is to be applied'. What is the reason of the message?

New FAQ 004137 EN

According to the default setting in the program, it is defined that the loads act on all surfaces.

However, if there is no surface available in the file, the load cannot act and a warning will be displayed. If the message is confirmed by clicking 'OK', the load is still imported into the model but not applied to any surface. However, as soon as a surface is subsequently defined, the imported loads can act on it.
• ### Is it possible to set values of the standard user-specifically in RF-GLASS?

New FAQ 004135 EN

Yes, it is possible to create a new standard for which all values can be modified.
This user-defined standard is saved so that it can be used again at any time.
• ### How can I open an RSTAB 8 file in RSTAB 7?

New FAQ 004112 EN

For this, use the 'Open' command of the 'File' menu in RSTAB 7.

In the 'Open' dialog box, you cannot see the RSTAB 8 files at first because only files for the program versions RSTAB 7 (and previous) are displayed.

In order to be able to see all files (including the RSTAB 8 files) in a specific directory or folder, you have to change the file type to 'All Files' in the lower part of the dialog box. Then, you will also see the newer files for RSTAB 8 and can open them in RSTAB 7.

Important: We do not guarantee compatibility when opening an RSTAB 8 file in RSTAB 7. Thus, it is possible that the file or the model contained inside will be damaged. The module data and the results will also be deleted.

The same procedure is also possible in RFEM 4.

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If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

#### First Steps

We provide hints and tips to help you get started with the main programs RFEM and RSTAB.

#### Wind Simulation & Wind Load Generation

With the stand-alone program RWIND Simulation, wind flows around simple or complex structures can be simulated by means of a digital wind tunnel.

The generated wind loads acting on these objects can be imported to RFEM or RSTAB.

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