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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AnswerIn the case of the "Main member only" joint type, the member can be cut at any angle. The cutting angle δ can be adjusted under the geometry properties (see the figure).
AnswerTo define a dowel connection, the add-on module requires the minimum member length. This is 42 cm. If a member is shorter, the text "Member is too short" appears in Window "1.2 Nodes and Members" (see Figure 01). However, the structural component is often broken by intermediate nodes, and consists of several members. In such cases, the structural component can remain as a member in RFEM and the nodes can be used with the "Create Node 'On Line'" feature (see Figure 02). Thus, the member is not divided. All members connected to these nodes are then connected to each other, even if the member is not divided. As an alternative, it is possible to use the "Divide Member" feature with the "Place new nodes on the line without dividing it" option (see Figure 03).
AnswerThe design of wood joints with pin-shaped fasteners is currently limited to steel-wood joints according to Chapter 8.2.3. Pure wood-wood compounds on shear under consideration of the Johansen theory are therefore currently not possible. Direct wood-wood connections by means of full-thread screws are possible with the module RF- / JOINTS wood - wood to wood with which main secondary beam connections can be calculated.
AnswerIn the current standards, fasteners or connections are always designed in one plane only. The reason for this is that the designs for shear etc. can only be analyzed in the 2D plane. The hole design, for example, is not possible for a failure from the plane.Since internal forces in v y and v z can always occur in a three-dimensional calculation, it has been proven in practice to allow a small proportion of internal forces in secondary direction and not fully utilize the connection. However, if the ratio of shear force in secondary direction is too high, a detailed analysis with an FE simulation might be necessary.
The easiest way to find the internal forces at these nodes is to print graphics of the members in the printout report.
In the event that this solution is not an option, you can also take the values from the result table 4.1 in the printout report. Since the extreme values are only activated by default, it is still necessary to activate nodal values in the selection.
It is usually not reasonable to include the internal forces of all member in the printout report. Therefore, you can only select the members that are relevant to you.
In the RF‑/JOINTS add-on module, you can export result graphics as DXF files. The corresponding button is below the graphic in Window 4.1 (see Figure 01).
After you click the button, the Windows dialog box "Save as" appears where you can enter the name and the file path of the DXF file.
RF-/JOINTS is divided into several joint groups. Each of these joint groups requires a separate license key. If RF‑/JOINTS detects a key, the joint group is marked with a green circle.
In your case, you have probably selected a joint group that is not licensed. Therefore, please set the joint group that you have purchased. The message about the demo version should disappear then.
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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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