In order to use internal forces from average regions also for design of concrete surfaces, you have to activate them in the module. For this, click the [Details] button in the “Tools” tab and select the option “Apply the averaged internal forces in the defined average region for the ULS calculation and for the analytic method of SLS calculation”.
In RFEM and RSTAB, it is possible to add user-defined dimension lines to a structural model. When creating these dimension lines, click the objects (for example end nodes of a line, members, etc.) which represent the reference points of the dimension. If you want to add a dimension line free from the structure previously defined in the model, you have to create an additional free “help node” which acts as a reference object for the new dimension.
As of the program version x.06.3039 of RFEM 5 and RSTAB 8, you can generate these help nodes for the dimension directly when entering the dimensions. To create a help node for the dimension, you can select the relevant option “Generate help node” in the dialog box for a new dimension. In the graphic window, you can then click the location on which the help node is to be generated.
The generated help nodes are listed in Table “1.1 Nodes” provided with the corresponding comment and can be selected by using the “Select Special…” function, if required.
For example, this option is useful when you need to create chain dimensioning for free surface reinforcement defined in RF-CONCRETE Surfaces (see figure). It is not possible to use the corner points of the individual reinforcement areas for the definition of a new dimension without creating a help node.
The RF-STABILITY and RSBUCK add-on modules for RFEM and RSTAB allows you to perform eigenvalue analysis for frame structures in order to determine critical load factors including the buckling modes. It is possible to determine several buckling modes. They provide information about the model areas bearing stability risks.
The critical load factor is always determined for the entire structure. Based on this, the corresponding critical loads of the individual members, effective lengths, and effective length factors are calculated.
A simple example of a rigid column with load introduction on the head (for example roof loads) and on the top third (for example crane loads) exemplifies the procedure in detail.
For the structural system, the critical load factor of 8.591 has been determined. This is to be multiplied by the normal forces of members to obtain the critical loads.
Member 1: Ncr,1 = 8.591 * 550 kN = 4725 kN
Member 2: Ncr,2 = 8.591 * 200 kN = 1718 kN
The corresponding effective lengths for buckling about both axes are calculated by using the adjusted formula Ncr = E x I x pi² / Lcr. Finally, the effective load factors are determined from the relation kcr = Lcr / L.
Now, it is possible to perform equivalent member design according to EN 1993-1-1. The critical load factors calculated in RF-STABILITY or RSBUCK can be transferred directly into the RF-/STEEL EC3 add-on module. Depending on the model complexity and loading, you should always check whether the stability design using imperfections and internal forces according to the second-order analysis would be a better alternative.
In order to use the working window area for graphical input of model data or for result evaluation in an optimum way, there are various options for arranging the Project Navigator, the table and the result panel.
1. You can hide them completely by clicking the corresponding button in the toolbar or by [X] in the title bar of the dialog box.
2. You can dock them onto any screen edge by dragging and dropping the title bar of the dialog box. For this, there are the icons for docking in the middle of the screen. If you drag the dialog box to one of these docking points, it is adapted automatically between the existing dialog boxes. If you drag the dialog box to the docking icon on the screen edge, it is placed over the entire width of the screen.
3. If there are two screens available, it is possible to undock the elements from the program interface and place them on the second screen by using drag & drop.
4. Furthermore, you can combine the Project Navigator, the table and the result panel in a single dialog box where a dialog box is dragged on the title bar of another one.
The network licenses of Dlubal Software provide a very convenient solution for an engineering office as well as for a user who is often on the move. It can be helpful if you are on a consulting meeting with the building owner and want to directly apply the current changes and show the solution immediately. You only need the Internet and VPN connection in your office and you can access all your purchased licenses.
In order to quickly find the license server, you can save the IP address of the network dongle computer in Admin Control Center (available on http://localhost:1947) under “Remote License Search Parameters” that can be found under “Configuration” in the “Access to Remote License Managers” tab.
As of the program version RFEM 5.06, it is possible to edit several tendons in the RF-TENDON add-on module at the same time. For this, it is necessary to select the corresponding tendons in the table of tendon arrangement.
This can be done by
~ constantly pressing the left mouse button and marking the tendon numbers,
~ pressing the Shift key and selecting the first and the last tendon number,
~ pressing the Ctrl key and selecting the desired tendon numbers by clicking the left mouse button.
RFEM and RSTAB provide the option to create national annexes with user-defined partial safety factors and combination coefficients. It is also possible to transfer them to other computers.
The user-defined national annexes are stored in the “KombiNorm.dat” file. In the case of the default installation of RFEM or RSTAB, you can find the file in the following directory:
C:\ProgramData\Dlubal\RFEM 5.xx\General Data
C:\ProgramData\Dlubal\RSTAB 8.xx\General Data
If you copy this file into the relevant directory on the target computer, it will be possible to use the user-defined national annexes there, too.