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Frequently Asked Questions (FAQ)
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AnswerYou can either define the nodal support or the intermediate restraint in RF- / STEEL EC3.If you already have nodes in your actual RFEM or RSTAB model, we recommend directly entering the nodal support in the 1.7 dialog box, because you can select the nodes directly in the model. See Figure 01.If you want to consider intermediate storage at a point in a horizontal beam where you do not have a node available in your actual system, you can use the intermediate support and select the intermediate support (for example Preload (lateral / torsional restraint)). See Figure 02.
AnswerRF-PUNCH Pro uses the support forces only for the punch supports for nodal supports.For the punching shear design on wall corners and ends, the member behavior is not used as the support force from the line supports but as the shear force in the critical perimeter. This has the advantage that a punching load can also be determined if a wall was entered in a 3D model instead of a line support. Thus, this approach in the add-on module is more general and can be applied regardless of the type of modeling.You can also find additional information about determining the punching load for wall corners and wall ends in an article on our homepage that you can open by clicking the following link.
AnswerWhen you design glass with the RF-Glass add-on module, the layer structure is defined in the add-on module (Window 1.2). The layer structure in the main window of RFEM is irrelevant here, because the add-on module creates a temporary calculation model during the calculation. It is only important that the surface stiffness is set as glass (see Figure 1).The same applies to the support of the wall. It is also performed completely in RF glass.We already have an interesting webinar about RF glass with the topic "Design of Glass Structures in RFEM" on our website.
AnswerYes, this is possible.On the one hand, you can determine the rotation about the Z-, Y-, or X-axis by selecting 2 or 3 nodes. Find the command in the button to the right of the input field for the angle of rotation. See Figure 01.If you have entered a member that has been rotated about its own axis (for example a purlin on an inclined roof), you can use the "member rotation ß" to rotate the nodal support. See Figure 02.
AnswerThe main reason for this is the FE mesh size as well as the different smoothing of the results. The results should be aligned with each other with an increasingly finer FE mesh. Figure 01 shows a comparison with a relatively coarse FE mesh. The support resultant is 16.84 kN. However, the resultant of the surface results is only 14.41 kN. If the FE mesh is refined at this point (see Figure 02), the results are similar. In Figure 03, the FE mesh has been refined further. The results are now exactly equal. The deviation at the start can be explained by the singular location and by the internal force size smoothing.
AnswerIn this case you should first check the result panel. Sometimes the display factor for the bearing forces is "0". Once this is increased, the arrows should be displayed again.
AnswerFE-BEUL offers in the details the choice between a rigid and deformable support stiffness for determining the reduction factor for shear bumps (see Figure 1).
AnswerYes, it works. For this, it requires the activation of the elastic bearing in the mask "Edit nodal bearing". On the basis of some input parameters such as type of bearing, column shape, material and the column height, the program determines the springs of the column (see Fig. 1).
AnswerPlease define bearings in the model, which contain the loads, otherwise no calculation is possible. In RSTAB you can, for example, provide node storage, in RFEM node, line and area storage.
AnswerFor a vault-free cross-section, a proof of the complete system is recommended using theory II. Order - internal forces and local imperfections. The entry of the effective lengths and nodal bearings (with staff sets) can thus be omitted. However, please activate gamma_M1 for cross-section verification.
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