- In most cases, these differences can be attributed to a lack of convergence. Increasing the number of iterations and increments in the calculation parameters and FE mesh settings should help (see Image 01).
- High jumps in stiffness result in numerical problems, which lead to errors in the results evaluation. In RSTAB, this is not a major problem for a complete and analytical approach function. In RFEM, on the other hand, approximation approaches are used, which are more likely to prevent high stiffness changes. An example of this are rigid members (very high stiffness) that are connected to softer surfaces or members. In this case, the rigid member can be replaced by a beam member with a stiff cross-section or by means of stiffness members with high stiffness.
- In case of members with elastic foundations, deviations may occur as well. If the members are not divided or only roughly divided, convergence problems occur. A practical solution is to select a "finer" distribution of members in the FE mesh settings (see Image 02).
- In the case of non-linear systems, changing the type of calculation can also help (see Image 03).
Question
Why is the sum of the loads different from the sum of the support forces? What is the cause of this?
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RFEM and RSTAB models can be saved as 3D glTF models (*.glb and *.glTF formats). View the models in 3D in detail with a 3D viewer from Google or Babylon. Take your VR glasses, such as Oculus, to "walk" through the structure.
You can integrate the 3D glTF models into your own websites using JavaScript according to these instructions (as on the Dlubal website Models to Download).
With the Camera Fly Mode view option, you can fly through your RFEM and RSTAB structure. Control the direction and speed of the flight with your keyboard. Additionally, you can save the flight through your structure as a video.
The direct interface with Revit allows you to update the Revit model according to the changes you have made in RFEM or RSTAB. Depending on the modification, the Revit objects may have to be regenerated (deleting the object and subsequent regeneration). The regeneration is performed on the basis of the RFEM/RSTAB model.
If you want to avoid this regeneration, activate the check box 'Update only materials, thicknesses, and sections'. In this case, only the properties of the objects will be adjusted. Changes different from those in material, surface thickness, and section are, however, not considered in this case.
The reinforcement proposal from RF-/CONCRETE Members can be exported to Revit. The rectangular and circular cross-sections are currently supported.
The reinforcement bars can be modified retroactively in Revit.