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Frequently Asked Questions (FAQ)
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AnswerNo, this is not possible.A member or a set of members is designed as a 'Structural Component' by the model column method.This means that the longitudinal reinforcement is constant over the entire length of the structural component.The design is carried out by means of the governing internal forces at the governing location of the structural component (member or set of members).A stability analysis involving a graded reinforcement situated over the column can be done by means of the nonlinear design for compression elements in RF-CONCRETE Members (RFEM) or CONCRETE (RSTAB).
AnswerThe RF-CONCRETE Columns add-on module uses the model column method with the nominal curvature or the nominal curvature method according to EN 1992-1-1.You can also find more information about the program features of RF-CONCRETE Columns on the product homepage via the following link. See links below.
AnswerIn the add-on module, the shear design is performed in the following sequence:1. VEd/VRd,c
3. VEd/VRd,pIn the course of VEd/VRd,max, the inclination of the concrete strut is determined and in the course of VEd/VRd,s, the reinforcement amount is determined iteratively.If VEd/VRd,max is not fulfilled in the design process, the subsequent design of VEd/VRd,s is not performed and the design criterion VEd/VRd,c is displayed.
AnswerIt is difficult to enumerate one or particular reasons for the deviations. Basically, the design in RF-CONCRETE Columns is an analytical method, the nominal curvature method according to EN 1992-1-1 5.8.8. One advantage here is that it is a standardized method and that all intermediate values of the calculation are output in the add-on module.By means of the intermediate values, it is possible to search for the cause of a deviation between different design programs.If you cannot find the cause, please contact our hotline. In this context, however, we need a printout including the input and intermediate values from the program used for the comparison.
Currently, there is no option to perform a stability analysis in the RF-CONCRETE Surfaces add-on module. However, it may be possible to perform a simplified design by means of a result beam by means of the nominal curvature method in RF-CONCRETE Columns.
AnswerYou can usually set the standard and the National Annex in the top right corner of an add‑on module (see Figure 01). In most cases, it is also possible to display the factors of the National Annex and edit them, if necessary (see Figure 02).
AnswerThe add-on module determines the required reinforcement for the ultimate limit state. The fire resistance design is performed as design based on the determined reinforcement. The reinforcement will not be increased in this context. If the design is not fulfilled, you can either define a higher reinforcement manually or adjust the concrete cover to prevent the applied reinforcement from being damaged too much by the effects of fire.
AnswerThe standard, which is used for the desing of a structural component, is specified in Window 1.1 of the add‑on module. To display and hide old standards, use the "Show Only Valid Standards / National Annexes" button in the list. They are marked in red.
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.In the settings for the national annex, there are limits defined for the maximum value of the yield strength. See figure 03. To change this limit, you need to create a new user defined national annex. See figure 04.
Presumably, the material was already selected in RFEM whose standard does not match the design standard. For example, 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.
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