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2019-09-18

Question

The sum of the support forces in my model differs from the internal forces in a result beam. What can be the reason?

Answer:
When modeling walls using surfaces in particular, there may be a deviation between the sum of the support forces and shear forces in the result beam. The reason is that the surface internal forces are integrated into the member internal forces. Depending on the size of the FE mesh, the results may be distorted or inaccurate.

You can use the following procedure to improve the results:

  • Reduce the size of the FE mesh. The deviations between the support forces and the shear forces should then approximate 0.
  • Increase the division for result diagrams in the calculation parameters. This also leads to an approximation of the results.

In the result diagrams, you can display a smooth line that smears the internal forces of the result beam over the entire length.

In the example file, the results were calculated for an FE mesh length of 1 m, a length of 0.25 m, and a division of 100. The sum of the loads is 885.3 kN.



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