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Frequently Asked Questions (FAQ)
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AnswerThe error message indicates that no option was found to define the required reinforcement for the mats and rebars selected from you.After clicking OK, you will automatically be redirected to Window 1.3. Here, please select additional mats and/or rebars and then perform the design again.
Yes, it makes because this affects the stiffness of the entire system.
When entering a level-floor downstand beam as a ‘Rib’, you will add the stiffness of the defined rectangular cross-section to the area of the line.
For the result beam, however, you have only to define the integration width. The entered rectangular cross-section does not influence the stiffness of the entire system but is only applied as a design cross-section in the add-on modules (e.g. RF-CONCRETE Members).
AnswerA thread cannot be created using a function in the program. In such a case, you have to create this geometrically via nodes and lines. In the program, there is an option to create the windings through trajectory surfaces. However, you have the option to reach your target relatively quickly when using Copy and Rotate.
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.
Please check the definition of the scissor hinges in the RSTAB 8 file.
To properly consider the function of the scissor hinge, the scissor hinge of the same type must be specified on the member ends of both members ‘touching’ at a node. If this is not the case, you receive the described error message.
If you have got this error message displayed when opening an RSTAB 8 file in RFEM 5, this may lead to problems in the calculation, for example, the structure becomes unstable due to incorrect hinge definition (already in RSTAB 8).
The problem should, therefore, be adjusted either already in the RSTAB 8 file or the RFEM model after import.
AnswerTo display the isosurfaces of the results in monochrome, you have to edit the color scale. To do this, simply double-click the color scale or edit the color scale with the right mouse button (see Figure 01). The slider can then be pushed down so far that only one color remains. This can be changed by double-clicking the color. Then, the maximum value can be transferred manually to the penultimate input field (see Figure 02). If you want a colorless display, define a very small number for the penultimate value. It is also recommended to activate the ‘Outlines of Deformed Surfaces’ option (see Fig. 03).
You can connect a rib member to a line on two surfaces with different thicknesses.
To determine the stiffness or internal forces, the eccentricity of the rectangular cross-section is determined using the mean value of both connected surfaces in RFEM.
For designing in RF-CONCRETE Members, the add-on module determines its cross-section, which is displayed in the input dialog box ‘1.4 Ribs’ of the add-on module.
By clicking the ‘i’ button (see Figure 02), it is possible to open an info dialog box for the generated rib cross-section, where all cross-section properties applied for the design in the module, like the position of the shear center and centroid, etc., can be viewed.
If the ‘Effective Width’ is adjusted in the ‘1.4 Ribs’ dialog box (e.g. to 0.50 m) this has influences on the cross-section applied in RF-CONCRETE Members and its cross-section properties.
However, this does not influence the stiffness or the determination of internal forces in the 3D model in RFEM.
This setting can be made in the RF-LOAD-HISTORY add-on module under ‘Details’ → ‘Options’ → ‘Deformation Type’, see Figure 01.
The deformation type 'In Particular Load Step' displays the deformations of each individual load step separately, the deformation type 'On Undeformed Structure' shows the sum of all load steps.
AnswerYes, in the global selection, it is possible to select the chapters that you want to get displayed in the printout report. To access this function, use the menu 'Edit' → 'Selection'.The four checkboxes in the "Display of" section at the bottom left control whether a cover sheet, a table of contents, small info pictures, and large headings should be displayed in the report margin.
AnswerYes, that is possible. Simply select the structure to be copied. Make sure that the line releases and all released objects are also selected. Now you can create a copy with the 'Move and Copy' function.
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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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