#### Further Information

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• ### I would like to use surface releases to model a bolt connection, which can only absorb compressive stresses from the support. Unfortunately, I cannot do this because my model is always unstable. Is there a model as a template?

The best way is to create the bolt as a single solid and not from several partial solids (within the hole). Then, you can arrange the surface release between the contact surfaces of the solids. In the case of a bolt connection, the setting for the surface release type would have to be defined with a nonlinearity in the uz direction.

As an alternative, you can also enter releases and spring stiffnesses for the other directions.

• ### Are silos/tanks possible to export from RFEM into Revit?

Yes, this is possible. Silos/tanks are usually made up of one curved 2D surface. This 2D surface needs to be split into two separate 2D surfaces for the cylinder to be exported into Revit. If it is only made up of one surface, then only half of the cylinder will be exported.

To do this, create a cylinder with one single surface. Then draw a line exactly adjacent to the original line that was create perpendicular to the top and bottom of the cylinder.

Next, delete the surface and recreate two surfaces using the quadrangle tool.

This process is also demonstrated in the attached video.

• ### Does the nonlinearity that can be activated for a surface support in the z‑direction refer to the entire supported surface, or only to the areas that correspond to the nonlinearity?

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The nonlinearity of surface supports, that is, "Failure if positive/negative contact stress in z," see Figure 01, only refers to the relevant area.

In the remaining area, the surface support acts accordingly, see Figure 02.

• ### How can I display the result values on surfaces in the middle of a finite element?

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The values on surfaces can be displayed in the surface grid. Please note the following points:

• Dialog box "Edit Surface," tab "Grid": Activate "User-defined" and check the distance and the grid origin, see Figure 01.

• Results navigator: Activate "Values on Surfaces," deactivate "Extreme Values," activate "In Surface Grid," see Figure 02.

• ### Is it sufficient to use a line hinge between two surfaces?

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Yes, a line hinge between two surfaces is sufficient, see Figure 01.

However, if the two surfaces have different geometries, you should pay attention to the information in the technical article Arrangement of Line Releases Between Surfaces of Different Sizes.

• ### In my structure, a channel section runs flush with a surface. How can I display the welded connection in detail?

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For a detailed display, it is useful to model a contact solid.

For this, it is first necessary to divide the channel section into surfaces (right-click the member → Generate Surfaces from Member). Then, the web surface or the surface of the channel section to be welded must be projected into the steel surface:

• Copy nodes and lines into the plane.
• Divide the steel surface using integrated lines (right-click the member → Divide Surface).
• Define null surfaces as boundary surfaces of the contact solid.
Now you can create a contact solid between the two surfaces lying on top of each other (click "New Solid" → Contact Solid → select boundary surfaces), see Figure 01.

• ### In my structure, a channel section runs flush with a surface. What is the easiest way to simulate a welded connection?

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In this case, the simplest solution is the connection between the member and the surface by means of rigid members at certain distances, see Figure 01.

If necessary, you can previously divide the member by right-clicking the member and selecting "Divide Member."

• ### In RF-PUNCH Pro, I get an error message saying that the selected edges of the surface do not converge to a corner. What does it mean? How can I fix the error?

The program is not always able to automatically find the position of a punching node or the nearest edge. In this context, the error message mentioned above appears.

The problem can be solved by manual definition of the edge in the respective node.

• ### What is the meaning of "Common Surfaces" in RF‑PUNCH Pro? Do I have to set anything here?

The "common surfaces" (Column I in Window 1.5) have an informative character.

In theory, you can select or deselect the surfaces to be considered in the punching shear design, and thus shorten the critical perimeter (see the video).

It is usually not necessary to make any changes here.

• ### I have two solids that are adjacent to each other, but not congruent. What should be considered in the modeling?

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Two solids adjacent to each other share the common boundary surface in the contact area. Apart from it, that is, where no other solid is adjacent, the boundary lines of the other connected surfaces are defined, see Figure 01.

When modeling, it is necessary to divide the side surface of the larger solid.

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#### First Steps

We provide hints and tips to help you get started with the main programs RFEM and RSTAB.

#### 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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