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  • Answer

    If you are using members with cross-sections, which are not known be the interface, you should use the mapping file for cross-sections. The mapping file can be easily filled with the names of the cross-sections. In the left column of the table write the names of cross-section used in TEKLA and in the right column you write the DLUBAL names or select them from the library.
    Please check the attached video.

    In TEKLA you have to have loaded the right environment. In the video Chinese cross-sections should be transferred, so the Chinese environment has to be used in TEKLA.
  • Answer

    Define a suitable load case to correctly combine the planned prestress with the other load cases and apply a "pulling" strain to the members affected. A pulling strain load can, for. B.

    • a negative temperature load T c distributed uniformly over the cross-section,
    • a negative change in length ε,
    • a negative longitudinal displacement Δl,
    • a positive initial prestress V or
    • its positive final prestress V only in RFEM.

    Input via a Longitudinal Displacement is the most comprehensible input because you can directly measure the offset on the turnbuckle of a tension member.

  • Answer

    The logs or log files of an installation can be found under the following path:

    C: \ Users \ Public \ Documents \ Dlubal \ Logs

  • Answer

    For this case, the "Stiffnesses" member type is available. You can specify the member stiffnesses directly in a dialog box that you open with the [Edit] button. Thus, the assignment of a cross-section is unnecessary.
  • Answer

    In our programs, we use the operating system's fonts.

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

  • Answer

    For irregular member structures, the load generators "From Area Load on Members via Plane" or with "Cells" can be helpful. However, both functions assume that the nodes of the members lie in one plane. In the settings of the load generators, you can increase tolerances for the nodes to also detect nodes that lie outside the plane (see Figure 01). In interaction with the "fictitious lines", it is possible to load even more complex structures.
  • Answer

    You can adjust the column individually according to your wishes.
    Go to the toolbar and right-click in the empty gray area. Then, go to "Customize".
    Now, click the Load Case Description window and it will be highlighted in black.
    Now you can go to the right edge of the window and extend it.

  • Answer

    Friction represents a nonlinearity and can therefore only be modified via the interface to the member end release hinge.

    For this purpose, the member end release must be created first, if not already available. Then, the IMemberHinge interface is brought to the member end release and then to the nonlinearity (here IFriction ). Then , you can use the methods GetData and SetData to modify the data (here Friction ):

    Sub SetMemberHingeFriction ()

    Dim model As RFEM5.model
    Set model = GetObject (, "RFEM5.Model")

    On Error GoTo e

    Dim data As IModelData
    Set data = model.GetModelData

    Dim hinge (0 To 0) As RFEM5.MemberHinge

    hinge (0) .No = 1
    hinge (0) .RotationalConstantX = 1
    hinge (0) .RotationalConstantY = 2
    hinge (0) .RotationalConstantZ = 3
    hinge (0) .TranslationalConstantX = 4
    hinge (0) .TranslationalConstantY = 5
    hinge (0) .TranslationalConstantZ = 6
    hinge (0) .Comment = "Member Hinge 1"
    hinge (0) .TranslationalNonlinearityX = FrictionAType

    data.SetMemberHinges hing
    'get interface for member'
    Dim imemhing As IMemberHinge
    Set imemhing = data.GetMemberHinge (1, AtNo)
    'get interface for nonlinearity'
    Dim iFric As IFriction
    Set iFric = imemhing.GetNonlinearity (AlongAxisX)
    'get friction data'
    Dim fric As Friction
    fric = iFric.GetData
    fric.Coefficient1 = 0.3
    'set friction data
    iFric.SetData fric
    e: If Err.Number <> 0 Then MsgBox Err.Description,, Err.Source

    Set data = Nothing
    Set model = Nothing

    End Sub

    For Coefficient Vy + Vz, Coeffcient2 is used to set the second coefficient. The translational spring in the Friction dialog box is controlled by the translational spring of the Member-End Hinge. In the concrete case, this is TranslationalConstantX for the x-direction (see Figure 01).

  • Answer

    The new standalone program RWIND Simulation provides you with the options for wind simulation and for generating wind loads. The possibilities can be optimally utilized in conjunction with the FEM structural analysis software RFEM or the structural frame analysis software RSTAB .

    By directly importing models from RFEM or RSTAB , you can define relevant parameters of the wind directions to be analyzed with height-dependent wind profiles on the basis of a wind standard. This results in the corresponding load cases with globally defined parameters.

    Without RFEM or RSTAB, RWIND Simulation can be run manually. For this, the data can be imported from STL vector graphics.

    The import of terrain and buildings of the environment into the simulation is also possible from STL files.

    By exchanging data between RFEM or RSTAB and RWIND Simulation , you can easily use the wind analysis results as load cases in your familiar RFEM or RSTAB work environment.

    Services of RWIND Simulation
    • 3D incompressible wind flow analysis with OpenFoam solvers
    • Direct model import of RFEM or RSTAB or STL files
    • Simple model changes using drag and drop and graphical adjustment aids
    • Automatic corrections of the model topology with shrink wrap interconnections
    • Option to add objects from the environment (buildings, terrain, ...)
    • Height-dependent velocity profiles according to the standard
    • K-epsilon and K-omega turbulence models
    • Automatic meshing adjusted to the selected depth of detail
    • Parallel calculation with optimal utilization of the performance of multicore computers
    • Results in just minutes for low-resolution simulations (up to 1 million cells)
    • Results within a few hours for simulations with medium/high resolution (1-10 million cells)
    • Graphical display of results on the Clipper/Slicer planes (scalar and vector fields)
    • Graphical representation of streamlines as well as streamline animation
    If you need more information, please contact the sales department.
  • Answer

    In the "Global Calculation Parameters", there is the setting "Number of divisions of members for result diagrams."

    By default, this value is preset to "10".

    If members with greatly differing lengths are used in a model, it may happen that the preset value of "10" is too small. This is then, for example, the case that the parabolic moment diagram is not displayed correctly for the shorter members.

    To avoid the problem, enter a higher value, for example: Enter "50", for example.

    Thus, a parabolic moment diagram is also displayed on the shorter members.

    The length of the sections is obtained from the length of the longest member in the structure divided by the set number of member divisions. The finer division of members applies to all members of the model.

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