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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AnswerDuring the development of the FRAME-JOINT Pro add on module, the lower end plate overhang was fixed because it results in an improved load transfer of the compression force into the column.
It is not possible to deactivate the overhang 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 the web rib or the end plate is only possible with the JOINTS Steel - Rigid module. You can find an example in the download area.
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).
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).
AnswerTo perform a design for several connection nodes, the following points must match:
Deviations in the connection nodes may be as follows:
- the different connection nodes must use the same geometry type, for example, the knee crack
- The beam and the column (s) of the different connection nodes must be the same length
- the material of the column cross-sections and the cross-section material must match respectively
- The horizontal beam and the column (s) of the different connection nodes must have the same cross-sections
- Beams of different connection nodes must have the same inclination
- You can use different cross-section and material numbers
- the number of connected elements, such as tension diagonals, may deviate
- Different types of hinges can be used
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.
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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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