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This example shows you how to quickly determine the buoyancy or the uplift limit state of a vessel in RFEM.
RFEM and RSTAB offer the possibility to edit or check the combinations directly by entering text.
If you want to import a block with previously saved loads into an existing model, the load cases are not integrated into the existing load cases, but are added to the existing ones.
With the "Info About Object..." function available in the menu under "Tools", you can display all the information about an object by placing the cursor on it in the graphical window.
In RFEM and RSTAB, you can apply various visibilities in the Views project navigator.
In addition to the geometry and shape of a flat roof, you can also take into account the formation of an eaves area when generating the loading.
Occasionally, it is necessary to consider in a model that some beams only lie loosely on top of one another without screwing or welding.
In RFEM and RSTAB, you can generate loads from multilayer composition.
Warning Regarding Connection to Project
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When opening a model immediately after opening the program, there is a message window asking if you want to create a new project for the model in the Project Manager.
In RFEM and RSTAB, you can create add-on modules as favorites.
For free loads, RFEM allows you to display the intersections at the respective surface.
You can use the elastic support option to avoid singularities due to a fixed nodal support in RFEM. This can be defined directly in the dialog box of the nodal support as a column in Z. It is necessary to take into account the geometry of the column, the material, and the support conditions. Here, we want to look at the option of modeling the column as a surface foundation.
Often, it happens that stress peaks occur on a nodal support that is attached to a surface. You can avoid such singularities by modeling the nodal support as a column.
In RFEM and RSTAB, snow drift is considered according to 5.3.4(3) of DIN EN 1991‑1‑3 for saw-tooth roofs.
If, after defining the generated loads belonging together, you switch to the visibility mode, the loads are also shown on the hidden structural elements.
When you finish modeling a structure, it can often happen that some unused nodes remain in the model.
In many cases, it is necessary to filter the results for the display of values on surfaces so as not to show all the numbers. In displaying the reinforcement arrangement, you can, for example, hide values that are below the already used basic reinforcement.
In RFEM 5 and RSTAB 8, it is possible to consider the roof overhang when generating the loads automatically.
The load generator in RFEM and RSTAB provides a powerful tool for determining wind loads.
The "Tangent to Circles or Arcs" function can make modeling easier for you. You can find the appropriate command in the "Tools" menu.
When modeling in RFEM, double lines may be created. To quickly find and delete them, if necessary, RFEM 5 allows you to export overlapping lines. This is possible, for example, in Excel or in a separate group of sections.
The simplest way to model a bolt connection in RFEM 5 is to define a node in the center of a hole, then connect it by means of internal members to the surface.
If you want to orient a nodal support to the member axes of the connecting member, the easiest way to do this is to use the "Pick Member and Import its Rotation" function.
From time to time, it may happen that the axis systems of some surfaces in the model do not correspond to each other.
If you want to split a surface limited by four sides into several surfaces, the easiest way to do this is to use the "Split Surface" function.
Settlement within a structural system can also affect the surrounding structures. The adjacent settlement of separated slabs can be considered with RF-SOILIN using a small trick.
In the existing standard, there were no regulations for the distribution of snow loads for elevated solar thermal and photovoltaic systems on roofs. Only distribution of the loads was advised. It was only with the National Annex DIN EN 1991-1-3/NA: 2019-04 that specific regulations were made for this.
Buildings often have extensions. If the roof levels are not at the same height, this height difference (if more than 0.5 m) must additionally be considered for the snow load assumption.
Wind blowing parallel to the surfaces of a structure can generate friction forces on these surfaces. This effect is important mainly for very large structures.
The wind loads are regulated according to Eurocode 1 - Actions on Structures - Part 1-4: General actions - Wind loads. The nationally determined parameters of a respective country can be found in the National Annexes.