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)
Customer Support 24/7
AnswerA collapse or tear-resistance according to DIN EN 1992-1-1, 9.4.1 (3) is not output separately in RF-PUNCH Pro and must be additionally taken into account by the designer.
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.
AnswerThe individual members of a set of members must have an identical orientation. Furthermore, the orientation of the members and the set of members must match.Solution:In the Display navigator, you can display and check the orientation of members and sets of members. Use the shortcut menu to invert the Orientation of a member or set of members (see Figure 03)
AnswerUnfortunately, the add-on module RF-CONCRETE Surfaces for RFEM 5 is not designed for the design of sandwich elements. Therefore, there are no essential designs for structural components like For example, the shear joint check. Regardless of whether it is a wall or a slab.The bending design, and in particular the check of the shear force resistance, is designed for constant cross-sections.You can model the sandwich elements as surfaces with a constant thickness and perform the design in RF-CONCRETE Surfaces. If necessary Additionally required designs would have to be performed separately.
AnswerThe add-on module RF-CONCRETE Deflect is available for the calculation of state II deformations in RF-CONCRETE Surfaces.For the analytical calculation of deformations in state II, RF-CONCRETE Deflect requires a unique load situation, which is given only by using the load combinations (COs). Result combinations do not offer a clear load situation, whether additive or as an enveloped OR combination. Therefore, when applying the RC for the calculation of deformations in RF-CONCRETE Surfaces by RF-CONCRETE Deflect, you receive the mentioned error message. See Figure 01.To avoid this problem, you can simply generate load combinations (COs) instead of result combinations (RCs). If you still want to perform the ultimate limit state design with RC's, you can create a CC for each in addition to the existing RCs for which you want to calculate the deformations by means of RF-CONCRETE Deflect. See Figure 02.It is important that RF-CONCRETE Surfaces calculates the loads from the quasi-permanent design situation by default for the calculation of the deformations. See Figure 03. This means that the CO for which the deformations are to be calculated must be defined as "quasi-permanent." Alternatively, the check boxes for the settings of the design situations (see Figure 03) can be user-defined.
AnswerThe option to control how new structural elements are applied to the already existing, deformed structure in the design states.Starting position:The new elements are applied with orientation to the initial position, that is, the provided geometry. The deformations are compensated throughout the construction process. Theoretically, there is a buckling in the geometry (Figure 02 1.)Tangential:The new elements are applied with the orientation of already deformed elements that are already existing, that is, tangent to them. Deformations are not compensated during the construction process. Theoretically, there is no buckling in the geometry (Figure 02 2.)
AnswerThe sets of members to be designed in the add-on module must be based on the same or uniformly running cross-section.A special feature is a set of members consisting of ribs. This results in an identical cross-section only if the integration width of the rib is selected to be the same. Thus, there must be a uniform rib type for the entire set of members.Tapered sets of members are only designed if the entire set of members is linear
Has cross-sectional shape.
AnswerIn RF-LAMINATE, it is important whether you design a result combination or the load combinations in it. If you select the load combinations for design in the general data, they are displayed with the shortest load duration of the included load cases. However, if you select the corresponding result combination for the design, RFEM does not calculate the envelopes of the result combination. Since it is unclear from which load cases the maximum or minimum value results from an enveloping, the load duration of "permanent" is used for the design on the safe side for this result combination. However, you can change this input in Window 1.4.The advantage when designing the result combination is the faster calculation and is especially advantageous for a preliminary design in the case of a very large structure. If the governing load cases are known, it is recommended to modify the Load Duration class in window 1.4.If you want to perform a more precise calculation, please select the corresponding load combination for the design in the general data.
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.
AnswerBy default, the compute core of the cross-section program SHAPE-THIN is used in the RF- / ALUMINUM add-on module to determine the stresses of the effective cross-section in an iterative procedure. This method is precise because all vertices and edges of the cross-section are considered, but can be very time-consuming for complex sections.Alternatively, it is possible to determine the effective cross-section by means of a simplified analytical method (see Figure 01) that runs much faster. In this approach, corners, fillets, etc. are neglected and subsequently compensated by a factor. No iterative calculation is performed. Therefore, the effective cross-section values may be higher than with the SHAPE-THIN calculation.In such a case, it is recommended to carry out the calculation with the analytical method and then to design only the governing structural component with the governing load combination with the SHAPE-THIN solution.
Did you find your question?
If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.
Your support is by far the best
“Thank you very much for the useful information.
I would like to pay a compliment to your support team. I am always impressed how quickly and professionally the questions are answered. In the industry of structural analysis, I use several software including service contract, but your support is by far the best.”