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Frequently Asked Questions (FAQ)
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AnswerThe Steel Type used is carried out in window 1.1 General Data of the CRANEWAY program (except in the RSTAB8 user interface). The list contains the types of steel that depend on the selected standard.You can select steel St 37 if you select the design standard "DIN 4132" (see Figure 1).When you select EN1993-6, you can also create your own User-defined material and use it for the design (see Figure 2).
AnswerIn most cases, only the material's name is transferred. If the name differs from the Dlubal Material Database name, the base parameters (modulus of elasticity, shear modulus, etc.) or the additional properties (yield strengths, tensile strengths, limit strains, etc.) are not defined. In such cases, it is not even possible to determine the internal forces of the structure.Some interfaces (for example Revit) are able to transfer the basic properties. However, the design modules present problems because they require additional material properties. However, these are only available as information in the databases specific to Dlubal.We can resolve this topic by linking the name of the imported material with the unique name of the Dlubal material library. This linking can be done in the conversion tables. To open the tables, click "File" - "Import" in the "Details" tab. The handling is relatively simple. On the left, enter the material name from the export file or the CAD application. On the right, the name according to the Dlubal Material Database. It can also be called directly.If you have several entries with a similar notation, you can use so-called "regular expressions". Further help can be found in the conversion file itself. The path is shown in the detail settings.The user is requested to create own tables. Dlubal can not provide any tables due to the multitude of programs and notations.
AnswerIn the Detail setting when inserting the block, you can select what is to be done for identical materials and cross-sections. If you want to combine them, activate the Options shown in Figure 01. Then, the new materials and cross-sections are combined with those available in RSTAB or RFEM.If the blocks are already inserted, it is possible to combine the cross-sections and materials later (see Figure 02). It is only important that the materials are combined first, and then the cross-sections, because a material is always assigned to a cross-section. To open the shortcut menu with the option "Merge identical materials", first click with the left mouse button into one of the cells in column A and then start the shortcut menu by clicking the right mouse button.
Finite elements with plastic material are divided into 10 layers. First, a normal elastic analysis is performed in the first iteration. Then, the stress in each element is calculated according to the set strength hypothesis in each individual layer. If the limit stress in one of the layers is exceeded, the stiffness of this layer is reduced. Based on the reduced stiffnesses of the 10 layers, an overall stiffness is determined for each element. With this new stiffness, we start a new calculation iteration.
Iterates until the changes are only small.
The total stress is converted into the stresses of the individual layers by means of the laminate theory. This theory is also applied for the conversion between the stiffnesses of the layers and the total stiffness.
4 different strength models can be used as the limit stress:
- Shape Change Energy Hypothesis (von Mises-tension)
- Shear stress hypothesis (Tresca stress)
- Failure hypothesis according to Drucker-Prager
- Failure hypothesis after Mohr-Coloumb
The choice of the failure hypothesis is shown in Figure 1.
The von Mises hypothesis is preset because it is the most frequently used strength theory.
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.
AnswerThe limits can not be modified in ALUMINUM. However, you can create a new material with modified boundaries based on the required material. Figure 1 shows the mask of the material library. Select a suitable base material here and then click on "Create new material ...". In the following dialog you can give the material a new name and change all parameters of the material.
AnswerThe easiest way is to start RFEM or the laminates module and create at least. an area and min. a load case. After you have selected the surface and defined the load case for dimensioning, open the manufacturer library (see Figure 1). There you can choose a structure.Afterwards you can check the material characteristics as well as the strengths (see picture 1 and picture 2).There is also an interesting webinar on " Designing Cross Laminated Wood Panels in RF-LAMINATE " on our website.
AnswerIf the colors are set according to the "Material" setting in the Display Navigator, then the full material name is displayed in the panel by default, ie Material Name + Standard (see Fig. 01). The full material designation is also displayed in the tables (Table 1.3) of RSTAB and RFEM.If you only want the material designations in the panel and tables, you can deactivate the full material designation in the "Program Options" dialog (see Fig. 02).
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 add-on module RF-MAT NL is already integrated in RFEM 5. It is assumed that the following material models can be used:Isotropic Plastic 1DIsotropic Plastic 2D/3DIsotropic Nonlinear Elastic 1DIsotropic Nonlinear Elastic 2D/3DOrthotropic plastic 2DOrthotropic 3D plasticIsotropic Masonry 2DIsotropic damage 2D / 3D
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