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Frequently Asked Questions (FAQ)
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The setting of the load application in the Details refers to the principal axes of the respective cross-section. For a Z-profile as an example, a box with the 9 edge nodes is put around the profile. The load application is then always related to the rotated principal axis angle and the corresponding eccentricities.
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The programs of Dlubal Software GmbH are subject to a continuous improvement process so that an improvement executed in this module is not unlikely over a period of about 18 years. It should be noted, however, that a design according to DIN 18800 is not up-to-date anymore, but that it is better to work with the current add-on module for steel design, i.e. RF-/STEEL EC3, according to Eurocode 3.
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Yes, that is possible. In the input window "Loads" of the add-on module, you can modify the loads by using the "Show Generated Loads..." or "Define Additional Loads..." button (see Figure 1).
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For cross-section and stability designs, the Eurocode provides for different partial safety factors. It is important to note if stability analyzes are carried out by applying the second-order analysis and applying imperfections as cross-section designs. In this case, reduce the resistances with γM1.
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Contrary to RSTAB and RFEM, you can find the language setting of the RX-TIMBER add-on module in the project manager of the program. The corresponding setting can be found under "Edit" in the menu bar (see Figure 1).
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In addition to the predefined supports "fixed" and "free", you can define a restraint in the RX-TIMBER BSH using the "Column" function. Spring stiffnesses are calculated analytically and displayed in the bottom right corner of the window (see Figure 1), whereby the relationships referring to height, cross-section and the definition going from "Hinged" to "Restrained" is used. These are considered for the later calculation. If you want to connect the beam rigidly to the column, you can make use of this function.
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The standard 1993-1-8 specifies, which kind of cross-sections can be considered. The designs are interpreted in such a way that only one wall thickness is possible per cross-section. If an invalid cross-section is detected, a corresponding message is displayed (see Figure 1). Therefore, the question about the extension for such cross-sections should be answered in the negative. The standard is largely based on tests/research. Therefore, the focus is on hot-formed hollow sections according to EN 10210 and cold-formed hollow sections according to EN 10219. -
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For the “Cable ...” material, there are no specifications for yield strength and tension capabilities stored in the database (see Figure 2). Therefore, the add-on module for these members is missing the calculation basis. For being able to design such materials, it would be necessary to create own material and, if the manufacturer information is known, add the missing parameters manually. -
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The defined stiffness modifications are only considered in the RF-STABILITY Stability Analysis if the option “Activate Stiffness Modifications from RFEM” in “Options” of the menu “1.1 General Data” is activated.
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You can either define the nodal support or the intermediate restraint in RF-/STEEL EC3.
If you already have nodes in your actual RFEM or RSTAB model, we recommend directly entering the nodal support in the 1.7 dialog box, because you can select the nodes directly in the model. See Figure 01.If you want to consider intermediate storage at a point in a horizontal beam where you do not have a node available in your actual system, you can use the intermediate support and specify the position of the intermediate support (for example, lateral and torsional restraint) there. See Figure 02.
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