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• ### For a defined free rectangular load, the selected projection plane of the load does not correspond to the load direction visible in the graphic.

New FAQ 003186 EN-US

The projection plane and the load direction are different parameters and independent of each other.

While the load direction represents the actual direction of the acting load, the projection plane, together with the corresponding coordinates of the load position, describes the plane from which the load's position is projected onto the loaded surfaces.

The graphic to the right in the "Edit Free Rectangular Load" dialog box is used for information purposes, see Figure 1.

• ### In RF-/DYNAM Pro, I get the error message No. 10040: "It was not possible to calculate the eigenvalues for the entered precision [...]". How can I fix this error?

New FAQ 003162 EN-US

In a dynamic analysis, you can only calculate the eigen modes as many degrees of freedom as the system has. With degrees of freedom, the number of mass points multiplied by the number of directions into which the masses act is meant.

Example

A cantilever that is not split by the FE mesh has a mass point at the end. The action direction of the masses in RF-/DYNAM Pro is limited to the X and Y direction. Thus, the system has 2 degrees of freedom, so only 2 eigen-modes can be calculated.

Caution: In this case, the choice of the solution method is very important. In contrast to the "Root of Characteristic Polynomial" method, the Lanczos method can not calculate all eigenvalues of the system, but only n -1, which means in this example only 1 eigenvalue.

• ### Which degrees of freedom are considered in the eigenvalue solver to determine the elastic critical moment for lateral-torsional buckling (Mcr) in the RF-/STEEL EC3 add-on module?

New FAQ 003116 EN-US

For the design with the equivalent member method and the general method, four degrees of freedom are considered in the eigenvalue solver. These are as follows:

• uY' (displacement from plane)
• φX' (rotation about the X'-axis)
• φZ' (rotation about the Z'-axis)
• ω (warping)
When the add-on module RF-/STEEL Warping Torsion is activated, there are seven degrees of freedom:

• ux (displacement in x)
• uy (displacement in y)
• uz (displacement in z)
• φx (rotation about the x-axis)
• φy (rotation about the y-axis)
• φz (rotation about the z-axis)
• ω (warping)

• ### Is it possible to design flat floors in RF-TENDON and RF-TENDON Design?

New FAQ 003025 EN-US

The module is designed for prestress in the immediate or subsequent composite. The templates for the tendon geometry are based on parabolic diagrams. This means that the modules are not explicitly designed for the calculation of flat slabs.

Possible Figure:

The geometric distribution for the free span of the tendon can not be determined automatically by the add-on modules. However, it is possible to use a user-defined tendon diagram as a basis. A prestress without bond could be set by adjusting the friction factors.

The deformation analysis can not be performed in the RF-TENDON and RF-TENDON Design add-on modules . However, a deformation analysis on the side of RFEM in conjunction with RF-CONCRETE NL or RF-CONCRETE Deflect and applying the equivalent prestressing loads could be carried out here. The equivalent prestressing loads are exported without influence of long-term losses and would have to be reduced by a factor corresponding to these losses in RFEM.

• ### After importing a .stp file, there is a free node near each bar. Why are these nodes created?

FAQ 002987 EN-US

The trigger for this is due to the rod rotation of a rod. A rod rotation can be defined in RFEM and RSTAB via two options:

• Option 1: Rotation by means of angle
• Option 2: Rotation by means of auxiliary nodes

These options can be set in the detail settings for importing the .stp file. If the function shown in Fig. 02 is activated, the first option is used with an angle. If this function is deactivated, an auxiliary node is automatically created, via which the rod rotation is defined.
• ### I would like to participate for the first time in a Dlubal webinar. What do I have to consider after I have registered?

FAQ 002871 EN-US

After you have registered, you will receive a confirmation e-mail with a link that allows you to participate free of charge in the webinar. Please open this link a few minutes before the start of the webinar and follow the instructions.

To participate in the webinar, you need a computer with Internet access as well as speakers, headphones, a headset or similar to hear the sound. Alternatively, you can receive the sound over a telephone (normal landline costs).

Your microphone is muted during the webinar. However, you have the option to ask questions by Chat.

FAQ 002860 EN-US

We record all our webinars and then post them for free on our website and YouTube .

• ### How can I display the free loads only within a certain area?

FAQ 002797 EN-US

Unlike the structural elements, it is generally not possible to mark and hide loads by means of selection.

In the Display navigator, only loads of the same type (such as Node Loads, Member Loads, Free Polygon Loads, ...) can be activated or deactivated for displaying.
Loads are always object-related. If a part of the structure is hidden, the corresponding loads are also hidden.

A special feature is the free loads. If they are not explicitly assigned to specific surfaces, they are always displayed - even if the loaded surfaces are hidden. Therefore, it is recommended to assign the free loads only to the corresponding surfaces.
The quickest way to do this is to use tables 3.6 - 3.11.

Note: For the 2D model types, it is not possible to assign the free loads to special surfaces and they are thus always displayed for the entire structure.
• ### Can I also use the wind load generator for open buildings?

FAQ 002780 EN-US

With the load generator it is not yet possible to generate the loads for open buildings.
You could generate the loads for a closed hall and then manually fill in the missing loads.

For free-standing roofs there are other assumptions according to the standard, which are not yet covered in the load generator. There is already an interesting article on the wind load on a freestanding roof on our website.

• ### I get the warning 11006 "The free load is not used on any surface" although the load is exactly on a surface edge, what can I do?

FAQ 002724 EN-US

Free line loads have no tolerance to surface boundaries. This means that the coordinates of the line load must match those of the line except for the last decimal place, or the line load must be shifted inwards by 1mm, for example.
In the example shown in Figure 1, the line load runs exactly between two nodes, which do not have the absolutely same coordinates in the x-direction. Here you can select exactly the nodes via the picking tool in the last dialog.

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