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.
Frequently Asked Questions (FAQ)
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AnswerIf a member is splitted into surfaces, it is necessary to connect the newly created surfaces with the existing members. This can be done, for example, with a rigid surface (option 'Create Frontal Plates on Both Edges' in the settings, see Image and Video).
AnswerWith the time history monitor, you can view all results over a period of time. In this case, it is also possible to select several parts of the structure and then export the results directly to Excel.
The plasticity for 1D elements currently only works in relation to the normal stresses in a member. This means that only interaction between axial force and moment is possible. The shear force interaction is not taken into account. In addition, the stresses from shear force are only calculated elastically.
When applying a plastic material model, it is also important to ensure a sufficient division of the elements, because a cross-section is internally generated at each Gauss point on the member element where the stress is calculated and a reduction of the stiffness to the re-distribution of the internal forces is performed, if necessary. If, for example, the number of divisions is increased, the model may become unstable because the redistributions of stresses can no longer be carried out and thus the cross-section's loading is too high.
It is generally recommended to use a division of '50' for member elements when using the plastic material model (see the figure).
AnswerUnfortunately, there is no automated function for this. In this case, you can use the drag-and-drop function to move the node to one of the corner nodes and then create the crossing members again.
When using a diagram in the program, the first strain is always given. (Initial strain). It depends on the output modulus of elasticity and cannot be controlled directly. There is a trick in the program to nevertheless adjust the first strain to the desired value. To do this, you have to calculate the initial modulus of elasticity and enter it in the material parameter. In this case, the following procedure would be used.
In the results tables of the RF-DYNAM Pro module, the stresses for solids are not displayed. To be able to display the stresses and internal forces, it is necessary to export the results to a load case or to a result combination. Then, you can look at the results in a load case or a result combination as usual.
AnswerYes, it is possible to resize them by right-clicking next to the symbol area.
AnswerUnfortunately, such a possibility does not exist in the program. There is only the option to edit the existing load and redefine it, if necessary.
AnswerWith the FE mesh refinement, it is also possible to create an aligned FE mesh in the program. Thus, the automatic FE mesh generator can be controlled to a certain extent. However, it is not possible to use it for setting of a specified mesh geometry.
In RFEM, it is possible to define a surface grid for the results output. The grid can be related locally to the surface or to a global point in the coordinate system. Thus, it is possible to refer the grid to the same origin for each surface. However, you have to define this setting individually for each surface.
The video illustrates the procedure.
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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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