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Frequently Asked Questions (FAQ)
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It is not possible to display support forces. However, you can perform a design with RF- / FE-LTB: It contains the output of support forces.
To get the result of the MAX/MIN support reactions with the associated values on different crane runway girders, the design of both girders in CRANEWAY is required. For this, select the option "Both Girders" (Rmax and Rmin) in Window 1.4 Loading (see Figure 01).
Then, select the Only max/min option in the result window 2.3 Support Forces at Bottom Edge. The results are then displayed for both girders (girders with Rmax and girders with Rmin) sorted by the individual load components and the supports. There are two lines with results for each support and load component.
Figure 02 shows the following values for Support 1:
- max Pz = 84.66 kN (for the crane position LC 20 on the girder with Rmax)
- max Pz = 20.51 kN (for the crane position LC 100 on the girder with Rmin) = associated
The problem is the minimal inaccuracies in both models. If the support reactions are transferred from one model to another, they are exported as "free loads" with fixed coordinates. If the coordinates do not match for 100%, it may happen in edge areas that the support reactions are not considered if the corresponding objects are located slightly shifted next to the surface. The geometric relations can be quickly checked by displaying the "Full Precision" for the nodes and loads (see Figure 01 and Figure 02).
It is often helpful to regenerate the model and to round the nodal coordinates to six decimal places, for example. This function can be accessed using the menu "Tools → Regenerate Model" (see Figure 03).
Another solution would be to move the border lines of the surfaces, into which the loads are to be imported, a few millimeters from the outside. This ensures that all free loads are within the surfaces to be loaded.
First, open the result diagram of a member, line support, section or line. Then select the desired internal forces and deformations.
Finally, right-click the navigator and select Save Check Boxes State.
Use Refresh Check Boxes State (this button is now available) to cancel your settings.
The resulting support forces are characteristic values including redurec dynamic factors and therefore, you can use them directly for further analysis.
AnswerIn RFEM, you have the option to import loads as support loads from other models.
Support loads can be imported to the current load case from other RFEM models as nodal and line support forces. To do this, select on the menu "Tools" -> "Import Support Reactions As Load."
A dialog box appear, where you define the model, from which you want to import the loads. Furthermore, you need to specify the LC, CO, or RC numbers and the corresponding surfaces, nodes, and lines, whose support reactions are relevant.
You can also determine the load position. Please note that the other model has to be calculated and saved (optional).
Please note that it is not possible to import from a 3D to a 2D plate.
AnswerThe maximum support force of a RC is zero because the load combinations included in the combination are defined as Variable (potentially). Since all support forces of these LCs have the negative sign, the resulting RC has only a negative value. Thus, the other value is zero because it is possible that no LC is acting (therefore "potentially"). Zero as a maximum is greater than any negative value.
To solve this problem, you have to define the load combinations included in the RC as Permanent:
RC1 = RC1/permanent or RC2/permanent or RC3/permanent.
In this way, the load combinations 1 to 3 will be compared. The most unfavorable value always gives the minimum and the maximum result.
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