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  • Answer

    It might be advisable to (de)activate the hardware acceleration.

    In RFEM and RSTAB, you can activate or deactivate the hardware acceleration (OpenGL) by using the menu "Options" → "Program Options" in the "Graphics" tab of the dialog box.
    In addition, you can set the improved smoothing (antialiasing) in the same dialog box to prevent the edge effect. Both options are only activated after restarting the program.

    There could also be the problem that the graphics card driver is outdated. Under certain circumstances, this may lead to problems when using RFEM and RSTAB. Therefore, please update the driver.



  • Answer

    This problem is not caused by RFEM nor RSTAB, but by the clipboard capacity of Word.
    When printing the graphics to the clipboard, the maximum resolution of 4000x4000 pixels is possible. The maximum image dimension (that is, the height or width) is governing and the smaller side dimension is scaled down.
    Thus, if there is a nearly square graphic that is then to be saved with the maximum resolution, the result is a file size of 4000*4000*3 = 48,000,000 bytes = 48 MB.
    In general, Word can "remember" up to 24 elements in the clipboard.
    Thus, the clipboard capacity of Word can be reached quickly and the other images are no longer recorded.
    To be able to insert further graphics into Word, it should be closed and restarted.

         
  • Answer

    Yes, it is possible.


    You can "Lock all picture" in the printout report by using the corresponding button in the toolbar.


    Furthermore, you can select the "Lock graphic picture (without update)" option directly when printing the graphic into the printout report.


    A graphic already contained in the printout report can also be locked retroactively. To do this, right-click the graphic and open "Properties ..." In the "Graphic Printout" dialog box, you can select the "Lock graphic picture (without update)" option.


    The locked graphics are indicated by a small lock symbol in the navigator of the printout report.


  • Answer

    In Project Navigator - Display, select the option Colors in Graphics According to -> Visibility (see Figure 01).
    Then, select the visibility for Surfaces by Support in Project Navigator - Views (see Figure 02).
    In the printout report, you can then display the table with the surface supports as well as the colored display of the surface supports including the legend (see Figure 03).
  • Answer

    3d objects in the format "3ds" can be easily loaded in the program via Insert → visual objects in the existing model (see image). In the mask "new visual object" the scale, the insertion point and the rotation angle can be adjusted.
  • Answer

    If you want to print graphics in a report, the corresponding subitem must be active in the selection of the printout report in the "Global Selection" tab, see Figure 1. As a result, the tables are also displayed.

    If you only want to print pictures in the printout report, it is necessary to deactivate the tables in the tabs, see Figure 2.

    Afterwards, it is also possible to save report templates so that they can be used again in other positions. New templates can be defined in the printout report menu:
    Settings → Printout Report Template → New or New from Current Printout Report, Figure 3.

  • Answer

    Basically, it is difficult to make a general statement about the optimal hardware. It always depends on what kind of models you want to calculate. The following information helps you to configure a computer that is best suited for your purposes.

    Processor

    The calculation of RFEM benefits from several calculation kernels. However, it is not always true that more cores are better.

    If the calculation is distributed over a large number of cores, the traffic increases and the connections between the cores and the storages become more and more bottleneck.

    Research has shown that the maximum of 10 to 12 cores are reasonable for the calculation in RFEM.

    A good compromise between the performance and price are the current eight-cores.

    XEON CPUs have no advantage over desktop CPUs in our software, quite the contrary. In many situations, RFEM can only use one core. The RSTAB kernel also uses one core only. In order to achieve a good performance, a high turbo cycle frequency is important. For XEON processors, it tends to be lower than for desktop processors.

    Specifically, we recommend using one of the following processors:

    • Intel® Core™ i9-10920X
    • Intel® Core™ i9-10900X
    • Intel® Core™ i9-9900K
    • Intel® Core™ i9-9900KS
    • Intel® Core™ i7-9700K

    Basically, processors from Intel are recommended. We do not yet have any experience of our own with the Ryzen processors.

    The modern processors have a sophisticated temperature management. The cycle frequency is adjusted dynamically depending on the temperature in the processor. This means that a good cooling of the processor can improve the performance. Therefore, we recommend a generously dimensioned computer case and a good cooling fan for the processor.

    RAM

    It is important for the speed to quickly connect the random access memory. Therefore, it is recommended to use DDR4 RAM.

    In RFEM, the optimal RAM size depends on the FE mesh of the model or, in RSTAB, on the number of members. Unfortunately, it is not possible to directly deduce the size of the required memory from the number of FE nodes or members. It only helps testing.

    We recommend to initially equip the computer with 16 GB of RAM. It is useful to equip the mainboard with RAM so that a simple upgrade is possible.

    Make sure that all memory channels are used.

    ECC memory, as offered in some workstations, has no speed-related advantages for RFEM and RSTAB.

    Graphics Card

    For the graphics card, we recommend to use a graphics chip from Nvidia. The integrated graphics processors from Intel are not suitable.

    We advise against using Quadro boards and recommend a "game board" of the GTX series with Pascal architecture (GTX 10XX) or the RTX series with Turing architecture (RTX 20XX) instead. Games and Quadro boards hardly differ in hardware. The game card drivers are known to be more problem-free in terms of RFEM/RSTAB and are cheaper than the Quadro cards.

    The size of the memory on the map is not relevant for RFEM/RSTAB.

    It is important to install the current driver for the graphics card.

    In order to avoid complications, it would be good to deactivate the graphics chip integrated in the main processor right in the BIOS. Otherwise, you have to assign the NVIDIA chip in the NVIDIA control panel of RFEM/RSTAB.

    Mass Storage

    A quickly connected SSD (possibly NVMe) is useful. However, this only provides an advantage for the computing speed in exceptional cases. But opening and saving large files is faster.

    Software

    The software that is otherwise running in the background can be decisive for the computing speed.

    An antivirus software running in the background can considerably slow down the calculation. During the calculation, RFEM and RSTAB have to write many files into the working folder and read them again. It may have a positive effect on the computing speed if you exclude this folder from the real-time monitoring of your antivirus software (see Figure 02).

    BIOS Update

    Customer experience has shown that the firmware on the motherboard did not run optimally on a computer with a lot of RAM. This resulted in a significantly reduced computing speed. If you are using a very new board, you should check if a BIOS update is available.

  • Answer

    Unfortunately, no. In our experience, the quality of the printout depends on the printer driver. In case of problems, please try to find the solution there first.

    If the rendering is already jagged in RSTAB or RFEM, this is due to the graphics card. The rendering is represented by means of the OpenGL functions. You can influence these by selecting "Options" → "Program Options" in the "Graphics" tab (see the figure). Another graphics card driver could also improve the display (download, for example, via www.treiber.de ).

    When plotting, huge amounts of data are processed. Thus, the limits of the operating systems are sometimes exceeded. The plot output in size ISO A0 with very good quality is therefore u. May be problematic. RFEM does not use its own drivers to control the plotter, but the drivers supplied by Windows. Tests have shown that these drivers are unstable and incorrect. Therefore, it is absolutely necessary to use the original drivers of the plotter manufacturer. The plotter should not be set as the default printer in Windows, but should be selected when printing.

    Many plotter drivers offer alternatives to prepare the graphic in the plotter or in the computer. The preparation in the plotter is faster, but because the plotter has only a very small amount of memory, parts of the image may be lost. This leads to missing labels, lines or fillings. Often, the plotter also displays a corresponding message, for example, For example, HP "Data Lost".

  • Answer

    If you want to rotate graphics by 90° in the printout report, you can do this using the properties of the graphics.

    To do this, it is best to right-click the graphic in the report. In the shortcut menu that appears, select 'Properties'.

    You can then enter the desired angle for rotating the graphic in the 'Properties' tab (see figure).

  • Answer

    Unfortunately, the graphics cannot be directly exported in JPG or BMP format. With the print option via the clipboard, you can paste graphics into other programs that allow editing and saving as a BMP or PNG file. However, a changed background color is not applied.

    Windows provides the "Snipping Tool" accessory. This is a screen-printing program that allows you to create graphics in GIF, PNG, and JPG format.

    There are, of course, also professional programs such as Snagit®. When inserting graphics, e.g. in PowerPoint, you should not change the size by dragging the edges, otherwise, the display will become pixelated. If you want to have it in a different size, you can adjust it in the image editor (pixels, etc.) or print the image again with a different view.

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First Steps

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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