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Frequently Asked Questions (FAQ)
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Yes, this is possible with the RF‑/JOINTS Timber - Steel to Timber add-on module. You can design the connection of two diagonals if they are connected with steel plates and dowels, for example. For this, it is reasonable to use the "Main member only" joint type.
After selecting the node in the program, the connection is still marked as insufficiently defined due to the steel bottom flange.
You can now deactivate both steel members to perform the design for the connection of the two diagonals only.
This design is possible in the add-on module.
Yes, it is possible - but only in RFEM . Unfortunately, this function does not exist in RSTAB.
To use the export of stiffnesses, it is necessary to activate the options shown in Figure 01 in Details. Thus, the stiffnesses are exported to RFEM before the calculation and the internal forces are calculated taking into account the flexible connections. However, no further static model is created, but the existing model is modified.
When you start the RF-JOINTS calculation, the eccentricity and connection are transferred to RFEM as member properties, and nodal releases are also generated in RFEM. This information can be found in the RFEM tables "1.14 Member Hinges", "1.15 Member Eccentricities", "1.24 Nodal Releases" and "1.30 Connections". The internal forces for the designs are then determined with the modified model.
There are export options for all members you can define eccentricities and hinges for. If there are already members with hinges or if there are trusses in the model, the additional connection hinges would lead to instabilities in the calculation. Therefore, a corresponding message appears before the dialog box is closed.
In the downloads at the end of this FAQ, you can find an example where the stiffness export is only shown for the eaves node. If you want to consider the flexibility of the fasteners, you should define all connections.
In order to perform a smooth calculation, the program defines a maximum number of connected members as well as a minimum angle between members. The geometric conditions are defined as follows:
- Maximum number of connected members: 8
- Minimum length of a member: 42 cm
- Minimum angle between members: 15°
If these boundary conditions are not met, a further calculation is not possible.
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).
AnswerThe easiest way to consider this is to use the RF‑/JOINTS Timber - Steel to Timber add-on module. For this purpose, the module decomposes the original connection, and creates a new structural system that considers the flexibility accordingly. In this case, the ultimate limit state, the serviceability limit state, and the accidental design situations are considered separately.
AnswerThe RF-/JOINTS add-on module is divided into several joint groups. For this, see the following FAQ.Therefore, there is no straightforward answer to the special aspects of the design as in this FAQ.In contrast to the RF‑/TIMBER Pro add-on module described in the mentioned FAQ, however, it is obvious that the RF‑/JOINTS add-on modules cannot design EC2, even if manually changing the LDC, for example in the RF‑/JOINTS Timber - Steel to Timber add-on module (see Image 01).Furthermore, this also applies to the add‑on modules RF̩GLASS and RF‑/CONCRETE NL.The reason for this is that there are stiffnesses exported in the program in the case of some joint groups of the RF‑/JOINTS add‑on module. For nonlinear calculations, the superposition with result combinations is not allowed. In the case of the second result combination mentioned above, there is the special feature that the superposition is no longer conservative, even in the case of simple structures. The design cannot be also performed correctly by manually changing the LDC.Nevertheless, if a result combination should be superimposed with constant and alternative additive, it is necessary to split EC2 in the attached file into load combinations as follows.
- RC2*=CO1 or CO2
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 timber connections with pin-shaped fasteners is currently limited to steel-timber connections according to Chapter 8.2.3. Pure wood-wood compounds on shear under consideration of the Johansen theory are therefore currently not possible. Direct connections between timber and timber using fully threaded screws are possible with the RF-/JOINTS Timber-Timber add-on module which is used for calculations of the main secondary beam connections.
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.
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Wind Simulation & Wind Load Generation
With the stand -alone program RWIND Simulation, you can simulate wind flows around simple or complex structures 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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