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Frequently Asked Questions (FAQ)
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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.
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).
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.
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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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