In addition to our technical support (e.g. via chat), you’ll find resources on our website that may help you with your design using Dlubal Software.
Frequently Asked Questions (FAQ)
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The RF‑/FRAME‑JOINT Pro add-on module designs rigid bolt connections between columns and horizontal beams, and classifies these connections. The rigid bolt connections are designed with the ultimate load method according to Eurocode 3 or DIN 18800.
The dimensions of an end plate can be defined in the add-on module. However, the bolts in the extensions are only possible in the extended top.
A bolt row in the extended bottom is not provided, and therefore the error message appears.
You can check the minimum dimension under the design hints in the add-on module.
The desired geometry can be entered in the RF‑/JOINTS Steel - Rigid add-on module.
Check the cross-sections of your frame joint or your connection.
The program checks whether the assignment of members is allowed for the calculation. If this is not the case, a footnote is displayed, which is explained in the "Comment" column. You have probably used a cross-section that is not intended for the connection design.
In our example, Note 23 is displayed and then the left beam is assigned manually: "Left Beam: Cross-section is not an I-section."
In Window 1.2 Cross-Sections, you can open the cross-section library to check which cross-sections can be selected for the frame joint type (activate the manual definition of geometry in Window 1.1 "General Data").
AnswerDuring the development of the FRAME‑JOINT Pro add on module, the bottom end plate extension was introduced as it causes an improved load transfer of the compression force into the column.
It is not possible to deactivate the extension and the minimum dimension of it is defined as follows:
uu = max
- End plate thickness
- √2 * bottom flange weld
- for end plate height < 200 mm → min 10 mm
- for end plate height > 200 < 400 mm → min 20 mm
- for end plate height > 400 → min 30 mm
AnswerThe design of a rigid connection of this type without a web stiffener or an end plate is only possible with the JOINTS Steel - Rigid add-on module. You can find an example under Downloads below.
AnswerFrom the formulae of EC 3‑1‑8, it is obvious that the ultimate tensile forces of the beam end plate are introduced into the column flange, and thus directly into the column web.
Therefore, the upper end plate is not fully stressed by these forces.
For purely structural reasons, the column head plate is available for stiffening and the buckling panel limit, and in case of the required diagonal stiffener, it is used for the transmission of the proportional force that goes into the stiffener.
AnswerThe easiest way is to change to the design notes after the calculation or after the note appears in the design notes (see Figure 02). In that case, this shows that the width of the end plate is not correct. From the input window 1.4.2, it is possible to quickly recognize in the graphic that the value is not within the valid range.This can be corrected very quickly by adjusting the horizontal bolt spacings (see Figure 03).
AnswerEspecially in the case of the "Column web, Compression Force, Bottom" design, a specified web stiffener is only applied to the design if it is actually required, or if the design cannot be performed without the web stiffener. In the latter case, the comment "Web stiffener required" appears in the last column of the result table.It is also important to note whether a continuous or a partial rib is applied.In the case of the partial rib, the compressive force is divided into a web and a rib and designed in this way.If a continuous rib is used, the column web is first fully loaded and the excess load is applied to the rib. In the case of T-joints and cross joints, this approach prevents the rib from being overloaded.
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).
AnswerThis message is usually displayed in the case that the member dimensions do not correspond.In the example model, the beam has a flange width of 200 mm and the column support of 160 mm.This joint is not valid in the add-on module as the flange width of the column should be at least as large as the flange width of the structural element to be connected. As soon as the cross-sections are defined according to this rule, the connection design can also be performed.
The difference may be caused by the standard wrench dimensions, which require minimum dimensions at several locations. Thus, the exact recalculation is difficult.
RF-/FRAME-JOINT Pro checks whether the wrench dimensions allow for the assembly of the connection. For this, it is possible to use standard dimensions or user specification. In order to ensure screwability, the dimensions D and L of a common socket wrench as well as b and h of a torque wrench, are specified.
However, you can change these spacings to reach the desired dimensions. To open the corresponding dialog box, use the "Details" button and the "Wrench Dimensions" button there (see Figure 01).
Did you find your question?
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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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