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  • Answer

    Cross-sections that are not contained in the cross-section library can be entered in RFEM / RSTAB in two ways.

    1. Cross-section programs SHAPE-THIN and SHAPE-MASSIVE

    User-defined cross-sections can be created with the cross-section programs SHAPE-THIN or SHAPE-MASSIVE. The SHAPE-THIN or SHAPE-MASSIVE profiles can be imported via the cross-section library. To do this, click the "Import cross-section from program SHAPE-THIN" or "Import cross-section from program SHAPE MORE" in the "New Cross-Section" dialog box (Figure 1). In this dialog box, you can select and import the desired cross-section. Please note that the cross-sections must be calculated and stored in SHAPE-THIN or SHAPE-MASSIVE before the cross-section values can be imported. It is only possible to import each cross-section individually.

    2. Create user-defined cross-section in RFEM / RSTAB
    If the cross-section values of the manufacturer are known, they can be created in the cross-section database of RFEM / RSTAB by using the option "Create new user-defined cross-section" (Figure 2). In contrast to the cross-sections created with SHAPE-THIN or SHAPE-MASSIVE, these user-defined cross-sections can not be designed in add-on modules such as RF- / STEEL EC3, because the data necessary for the design, such as c / t-parts, is missing.

    To access the user-defined profiles, click the "Load saved user-defined cross-sections" button in the cross-section library (Figure 3).

    User-defined cross-sections are stored cross-position-independent in the EigProf.dat file. Even with a version jump (for example from X.19.XXXX to X.20.XXXX), these cross-sections are imported. The storage location of the user-defined cross-section library can be determined with the Program Options (Figure 4). It is possible to copy a user-defined profile database already created on a work center and paste it into the respective directory of the other work center. The user-defined profiles are thus also available on the other work station without having to import them again.
  • Answer

    It is possible that the user-defined profile database EigProf.dat is missing on your computer or it is damaged. Please open the "Data Directories" tab of the program options and select the "User-Defined Cross-Section Library" category.

    Open the displayed directory and check whether the EigProf.dat file is available. If the file is available, please rename it.


    If the path including the file does not correspond to the default path for RFEM 5.20 'C:\ProgramData\Dlubal\RFEM 5.20\General Data\EigProf.dat' in the program options, set this default path in the program options.

  • Answer

    Yes, the problem might also be caused by RFEM. Previewing RFEM files in Windows Explorer may cause Explorer to react more slowly.

    For a possible solution, proceed as follows:

    Open the file ThmShellEx64.dll in C:\Program Files\Common Files\Dlubal, and rename it to BACKUP-ThmShellEx64.dll.

    In case of working with 32Bit version, open the ThmShellEx.dll file in C:\Program Files (x86)\Common Files\Dlubal, and rename it to BACKUP-ThmShellEx.dll

    Afterwards, a restart of the PC is required

  • Answer

    The data of an RFEM/RSTAB structure is saved as packed by default. If this packing process is interrupted or disturbed by another software, a faulty archive may occur.

    You can upload your RFEM/RSTAB file via our website and we will try to save the data. Please see the link below.

    To avoid this problem in the future, please save very large files locally on your PC and then move them to a network path, if necessary.
    Pay attention to the correct settings in your antivirus software, as they may also cause problems when reading and writing data.

  • Answer

    Depending on the geometric requirements of the bricks, these are integrated into classes 1 - 4. All geometric requirements for the brick classes are listed in Table 3.1 of the EN 1996-1-1. An example of assigning the classes according to the total percentage of the brick holes (% of the gross volume) is as follows:

    Class 1 (all stones)
    ≤ 25

    Class 2
    vertical hole ratio> 25; ≤ 55

    Class 3
    vertical hole ratio ≥ 25; ≤ 70

    Class 4
    horizontal hole ratio> 25; ≤ 70

  • Answer

    A mortar joint is applied when the bricks of a wall are not laid on one mortar strip but on two. In this case, the mortar has to be applied to the outer edges of the support surfaces of the bricks. By using a mortar joint, it is necessary to consider restrictions in the ultimate limit state, because unfavorable stress gradients occur in the wall.

    The application of the mortar joint is governed by the current version of the National Annex in each European country. In the German National Annex, the construction of masonry by a mortar joint is not allowed. In Germany, the interstices of support have to be mortared over the entire surface each time.

  • Answer

    Yes, this is possible with a combination scheme. This can be used to create user-defined templates.

    The Combination Schema dialog box can be accessed via the "Tools" menu. A scheme defined there can be used as template for your load data. You can create a combination scheme in any model and access it from any model.

    In a combination scheme, you specify the load cases, load and result combinations to be created with the relevant key data and the basic settings. In addition to the number of load cases, load combinations and result combinations, you can also define the factors and the type of superposition in a combination scheme.

    Then, when creating a new model, you can quickly access these settings so that you only have to enter the contents of the load cases (member loads, etc.). If you have already created several schemes, you can select one of them from the pull-down list.

    Click the [New Scheme] button to create another combination scheme. In doing so, you can copy the existing load cases and combinations of the current model.

    The button [Create Load Cases, Load Combinations, and Result Combinations Defined in Tables] transfers the current combination scheme to the model.

    The combination diagrams can also be exported to Excel and reimported.

    The user-defined combination diagrams are stored in the KombinSchema.dat file, which is located in the master data folder "C:\ProgramData\Dlubal\Global\Root File" by default. If you copy this file to another computer, you can also use the combination diagrams there.
  • Answer

    This cross-section is a Parameterized I-Section; it can be entered in the cross-section library. In addition to the parametric thin-walled cross-sections (see Figure 1), for which information about the weld is generally required, the parametrized cross-sections are oriented to the rolled cross-sections.

    Parametrization is possible for some of the rolled cross-sections (see Figure 2). This allows you to define e.g. parameters for the fillet radius, the flange thickness, and for the web thickness. To avoid opening the graphical user interface of the cross-section parameters in case of changes, it is also possible to adjust the cross-section dimensions directly in the text box of the cross-section. If a change was made, the cross-section is updated immediately in the background.
  • Answer

    For lightweight structures, there are many technical membranes.

    • Polyester fabric (PES) coated with polyvinyl chloride (PVC) → PES/PVC
    • Polyester coating covered with Polyvinyl Chloride (PVC)
    • Glass fabric → Glass/PTFE, coated with polytetrafluoroethylene (PTFE)
    • Polyester Fabric (PES) coated with Polyolefin
    • Polyester fabric (PES) coated with fluoroplastic 
    • Glass fabric coated with silicone
    • Open and closed mesh fabrics
    • Uncoated and natural fabrics
    • Ethylene-tetrafluoroethylene foils → ETFE
    Depending on the various properties, RFEM selects these materials for the respective project for each structural task. With regard to the structural analysis, all products have different load-bearing properties, some of which can vary with each production batch.

    In RFEM, you have to enter these different values in material table 1.3 in connection with an appropriate material model.

    There are model templates for the recurring use of materials in different models. Any selected list of membrane materials can be stored and loaded directly when opening a new model. 

    In most cases, membrane materials always consist of an interaction of solid material values and a material law. Since the existing material library only organizes materials with the material law “Isotropic Linear Elastic”, this database is not applicable for orthotropic membrane materials.

  • Answer

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