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)
Customer Support 24/7
AnswerDuring the development of the FRAME-JOINT Pro add on module, the lower end plate extension was fixed because it results in an improved load transfer of the compressive force into the column.
It is not possible to deactivate the extension and its minimum dimension is defined as follows:
uu = max
- End plate thickness
- √2 * bottom flange weld
- for end plate depths < 200 mm → min 10 mm
- for end plate depths > 200 <400 mm → min 20 mm
- for end plate depths > 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 RF-JOINTS Rigid add-on module. Find an example in the download section
AnswerFrom the formula of EC 3-1-8, it is obvious that the ultimate tension forces of the beam's 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 end plate is available for the stiffening and the panel boundary and serves for the transmission of the proportional force flowing into the stiffener in case of a required diagonal stiffener.
AnswerThe easiest way is to change to the design notes after having made the calculation or when the note appears in the design notes (see Figure 2). In this case, it is demonstrated there that the width of the end plate is not correct. When changing to the input window 1.4.2, it is possible to quickly recognize in the graphic that the value is not within the allowable range.This can be corrected very quickly by adjusting the horizontal bolt spacings (see Figure 3).
AnswerSpecifically, for 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 without web stiffener cannot be performed. In the latter case, the comment "Web Stiffener Needed" appears in the last column of the results table.It is also important to note whether a continuous rib or a partial rib is applied.In the case of the partial rib, the compressive force is divided into web and rib and thus designed.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.
AnswerIt is often the case that the member dimensions do not match.In the example model, the beam has a flange width of 200 mm and the column support of 160 mm.This joint is not allowed in the add-on module because 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 is also satisfactory.
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).
AnswerAs soon as a new node is selected for the design, the geometry is reimported from the main program RFEM or RSTAB, and the default values of the connection are preset.It is recommended to copy the design case in the case that there will be another modification of the previously defined connection considered. If you want to design 2 nodes with the same geometry, they should both be selected at the start.
AnswerThe auxiliary values λ1 and λ2 are required to determine the effective lengths.
These two values are used to determine an α value from Figure 6.19 of EN 1993-1-8, which is then used to calculate the effective lengths (for non-circular flow lines) of the T-stub flanges.
The maximum value for λ1 is 0.9 and the maximum value for λ2 is 1.4 -> see Figure 6.11 of EN 1993-1-8
Based on your geometry, however, the result is, for example, a λ2 of> 1.4 for the end plate
α can only be calculated with the maximum value of 1.4.
Did you find your question?
If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.
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.
Your support is by far the best
“Thank you very much for the useful information.
I would like to pay a compliment to your support team. I am always impressed how quickly and professionally the questions are answered. In the industry of structural analysis, I use several software including service contract, but your support is by far the best.”