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 non-designable situation like this is displayed if the shear resistance without shear reinforcement VRd,c is arithmetically smaller than zero.A VRd,c value of less than zero is caused by large tensile axial forces. In this context, the cross-section is completely under tension or completely cracked, and no shear force resistance can be created.For coated cross-sections with planned shear reinforcement, the following situation results:In RF-CONCRETE Surfaces, if VRd,c < 0, no further shear check is performed, and message 13) is displayed. This approach is conservative.In this context, there was a request (194) for the interpretation of the standard, which allows the truss model to be used even with a completely cracked cross-section.If a shear reinforcement is designed as planned, the message about the non-designable situation in the program can be ignored. In this case, it should be ensured that VEd is smaller than VRd,max and VRd,s.
AnswerThe default settings of the printout report are based on the default printer saved in Windows. When creating a new printout report, the default paper size of the default printer is used.If a paper size of less than A4 is set for the default printer, texts are displayed overlapping with the preset font size (see Figure 01)In the Current Printout Report, you can adjust the page size using the 'Set Printer ...' option in 'File' (see Figure 02).One possibility to change the default setting is to change the properties of the default printer or to select a different printer as the default printer (see Video).
AnswerYes, for the nonlinear calculation in RF-CONCRETE Members, it is possible to select the high-strength steel SAS 670 for the design. In this way, you can perform stability analysis for columns, among other things.The steel can be selected in the Materials section of the module (see Figure 01). Since DIN EN 1992-1-1 only allows fyk = 500 N/mm² by default, this limit must be adjusted when using SAS 670.In the general data, you can create a user-defined National Annex where the maximum value of yield strength is increased to fyk ≥ 670 N/mm² in Point 3.2 (see Figure 02).
AnswerIn order to consider smooth ranges in the design in RF‑STEEL Surfaces, they must always be activated in the detail settings of the add-on module. See Figure 01 with the detail settings in RF‑STEEL Surfaces.
AnswerYes, it is also possible to use the RF‑CONCRETE Surfaces add-on module to design bidirectional ribbed plates, bidirectional ribbed plates, or hollow core slabs. The design is possible for the ultimate limit state.
The plates can be created as orthotropic surfaces in RFEM (see Figure 01).
AnswerYou will find the corresponding option under "Settings" of the add-on module (see Figure 01).
AnswerThe option controls whether to determine the minimum shear reinforcement based on the dimensions of the structural component for a slab (b/h < 5) or for a beam (b/h > 4). The height or the thickness of the surface corresponds to h, and the smallest edge length of the structural component corresponds to b (see Figure 02).
AnswerAccording to the default setting in the program, it is defined that the loads act on all surfaces.However, if there is no surface available in the file, the load cannot act and a warning will be displayed. If you click "OK" to confirm the message, the load will be imported into the model anyhow, but not applied to any surface. However, as soon as you define a surface , the imported loads can act on it.
AnswerIn this case, the Calculation Method and the type of the 2D model are important.When using the analytical method (RF‑CONCRETE Deflect), it is possible to perform the calculation in 2D models. When using the nonlinear method (RF‑CONCRETE NL), the calculation for 2D XY (uZ/φX/φY) is not possible. In the nonlinear calculation, shrinkage is represented internally as strain load, which is not possible in this type of 2D model due to the limited degrees of freedom.Convert 2D to 3D ModelIn General Data, you can simply convert a 2D model into a 3D model. For the supports, all degrees of freedom not contained in the 2D model are fixed when converting to a 3D model (see the video).
AnswerIn SHAPE-MASSIVE, it is necessary to activate the reinforced concrete design in General Data. As soon as the design is active, you can make the corresponding settings for the design in a separate tab (Figure 01).There are three types of the design:Stress-Strain Distribution (Example 01):It is possible to determine the existing design ratio by specifying the internal forces.Design Safety (Example 02):The program determines the state of failure (ratio = 100%) and, related to this, the available safety.Design (Example 03):By specifying the maximum and the minimum diameter, or the minimum and the maximum reinforcement, it is possible to increase the reinforcement within the design.Irrespective of which one of these three methods is used, it is necessary to specify the reinforcement position and the acting internal force (Figure 02).
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.
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.
“Thank you for the valuable information.
I would like to pay a compliment to your support team. I am always impressed how quickly and professionally the questions are answered. I have used a lot of software with a support contract in the field of structural analysis, but your support is by far the best. ”