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Frequently Asked Questions (FAQ)
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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)
If one or more members with a circular cross-section have been dimensioned, A s, above and A s, are no longer indicated below: "Top" and "bottom" can not be defined for this cross-section; the reinforcement is inserted "peripherally".
Solution: Create a separate design case for the circular cross-sections (select the "File → Add New Case" module menu) and design the corresponding members separately. In the other design case, you delete the members with circular cross-sections. After the design, A s, top and A s are displayed at the bottom of the Results navigator.
AnswerIt is possible that the module determines a high required reinforcement for SLS if it is not possible to fit the provided reinforcement in the cross-section or rather in the reinforcement layer. It is also possible that the deflection analysis leads to high required reinforcement.SolutionIt could be a solution to increase the maximal number of reinforcement layers. With a higher number of reinforcement layers it is possible to provide a higher reinforcement (picture 1).For deflection analysis it could be a solution to disable the automatically increasing of the longitudinal reinforcement for serviceability limit state design and define a minimal reinforcement (picture 2). In combination with other SLS checks it could be useful to calculate the deflection analysis in a separate case.
AnswerThe input of the standard according to which the structural component is to be dimensioned is entered in window 1.1 of the add-on module. To display and hide old standards, use the "Only display valid standards / National Annexes" button in the list. They are marked in red.
AnswerPlease note that in the context of the nonlinear calculation, the reinforcement is not increased automatically. A nonlinear calculation is based on an already provided reinforcement. This provided reinforcement can result, for example, from the ultimate limit state designs or a defined ground reinforcement. The reinforcement applied for the SLS designs can be displayed graphically (see Figure 2).Cause of issue:If no reinforcement results from the ULS or the basic reinforcement in some areas, the serviceability limit state design is carried out without the applied reinforcement, and very high results may result, for example in the crack width.Solution to the problem:It should be ensured that there is a reinforcement in each zone of the structure. This can be implemented by applying a basic reinforcement (see Figure 3).
AnswerYes, it is.Open the table "1.2 Materials" and the material library for the reinforcing steel. See figure 01.In this material library you can create a new "user-defined" material and edit the standard presets for example for the yield strength. See figure 02.Afterwards you can select this user-defined material for design in table 1.2 in RF-CONCRETE Members and RF-CONCRETE Columns.It is the same for the RSTAB-modules CONCRETE and CONCRETE Columns.
AnswerPresumably, a material was already selected in RFEM whose standard does not match the design standard. Z B. a material according to DIN 1045-1 was selected, the design according to DIN EN 1992-1-1. The different material standards often provide different parameters.For this reason, it is preferable to select the material standard already in RFEM, which also applies to the design standard.
AnswerUnfortunately, there is currently no way to export the reinforcement from RF / CONCRETE Members into a CAD format. In RFEM, however, the design results from RF-BETON surfaces can be exported to a DXF file.
AnswerYes, this is possible, but this material must be created in the corresponding filter via the material library, so that all relevant information for the module is available. In addition, the standard group or standard must be selected so that it fits the design standard in the module.It is best to go to the material library and select the material category and group as well as the corresponding standard there. Create a new material after selection (see figure 1)Afterwards, a corresponding dialog opens by selecting a material name and the corresponding parameters (see Figure 2). The material should then be usable in the design.
AnswerThe deduction of the precamber in the serviceability limit state design is actually not regulated in steel structures. However, in response to customer requests, we have adopted the corresponding add-on module according to the timber or concrete add-on module. However, according to the standard specification, this value should only be considered in the quasi-permanent design combination.This does not apply to the characteristic and frequent design situation. Thus, as soon as the design situation in the add-on module is adjusted accordingly (see figure), the applied precamber is also subtracted from the resulting deformation.
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