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  1. Deformations as the First Result of an FEM Calculation

    Internal Forces Diagram/Surface Stresses - Smoothing Options

    The deformations of the FE nodes are always the first result of an FE calculation. Based on these deformations and the stiffness of the elements, it is possible to calculate strains, internal forces, and stresses.

  2. Figure 01 - Hall Frame as Basis for Surface Model

    Modeling Joints as Surface Model

    With RF-/FRAME-JOINT Pro, it is possible to design frame joints according to DIN 18800 or Eurocode 3. When considering non-standardized joints or taking a closer look at the joint and its behavior, it is recommended to use a modeling as surface model. The following article will show how such a model is created in principle.
  3. Figure 01 - Simplified Joint Diagram

    Modeling Prestressed Bolt Connection

    When modeling surface models, such as a frame joint or similar structures, there is always the question of how to model a prestressed bolt connection. In this case, it is always necessary to find a compromise between the practicable and detailed solution. The following article describes the modeling procedure of such a connection based on the joint diagram calculation method.

  4. Figure 01 - Structural System

    COM interface in VBA | 4.2 Frame Optimization

    Part 4.1 of this article series described the connection of the RF‑/STEEL EC3 add‑on module and the members and load combinations to be designed were already defined. This part will focus on the optimization of cross‑sections in the module and the transfer to RFEM. The elements already explained in the previous parts are not described again.

  5. Figure 01 - System

    COM Interface in VBA | 4.1 Frame Optimization

    Part 4.1 and 4.2 of this article series describes the optimization of a frame using the RF‑/STEEL EC3 add-on module. The fifth part explains how to link the module and get the relevant members. The elements already explained in the previous parts are not described again.

  6. Figure 01 - Individually Created EXCEL Tool in RFEM

    COM Interface in VBA | 3. Creating Tool

    Part 2.2 of the article series about the COM interface described creating and modifying nodal supports, loads, load cases, load combinations, and result combinations on an example of a member. This part explains creating individual tools.

  7. Eccentric Nodal Loads in RF-/FE-LTB

    Eccentric Nodal Loads

    There are two ways to specify eccentric nodal loads in RF‑/FE‑LTB. First, the nodal load has to be applied in the right direction. Then, you can assign either the resulting torsional moment or the eccentricity.

  8. COM Interface in VBA 1: Opening RFEM, Creating and Saving Model, Closing RFEM

    COM Interface in VBA | 1. Opening RFEM, Creating and Saving Model, Closing RFEM

    The first part of the post about the COM interface describes opening and closing RFEM. The programming language VBA is used in Excel, however the program sequence is the same as for programming with C#. First, it is necessary to add the corresponding reference in VBA to recognize the commands for the interface. The figure on the left shows the example of RFEM 5.

  9. Software Development Kit (SDK COM) as of Version X.06

    As of RFEM 5.06 and RSTAB 8.06, the examples and help files for programming the COM interface are not only available on the Internet but they are also included in the installation. For this, there is the ‘SDK’ folder in the project directory (usually C:\Users\Public\Documents\Dlubal).

  10. Figure 01 - System

    COM Interface in VBA | 2.2 Creating Member

    Part 2.1 of the article series about the COM interface described creating and modifying elements on an example of a member. In the third part, these core elements are used again to create nodal supports, loads, load combinations, and result combinations. Thus, the model created in the second part will be extended. Therefore, the elements explained in Part 1 and Part 2.1 are not described again.

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