Why do the foundation base pressure values ​​not look the same as the values ​​in the report and the 3D visualization?

Owned by Zeynep Aladağ
Last updated: Oct 21, 2024
2 min read

The maximum foundation base pressure is given in the report. I look at the analysis model foundation pressure control to see where this value is on the raft foundation, I cannot see the same values?

Situation

There is a rigid basement story in the building and in the Analysis settings, the calculation method of the buildings with 4.8.5 basement "Separate analysis for basements (as explained in 4.8.5.1, 4.8.5.2, 4.8.5.3)" has been selected.

Reason

The foundation pressure values ​​given in the 3D visualization are only intermediate values ​​found from the superstructure solution. The foundation pressure values ​​given in the report are the results of increasing and joining. In this case, you cannot see the foundation pressure values ​​printed in the report in the analysis model window.

Recommendation 1

In the calculation of 4.8.5 basement buildings in the Analysis Settings, when the "Separate analysis for basements" is selected, the foundation base pressure values ​​given in the report are the final values ​​combined after two loads. The soil stresses controls are combined and made with the values ​​given in the report.

image-20241021-121018.png

Do not consider the base pressure values ​​given in the 3D visualization as final values.

Recommendation 2

Instead of the separate analysis for basements calculation method, choose the single modal analysis calculation method and repeat the analysis.

image-20241021-121058.png

After the analysis, the base pressure values ​​for any loading condition shown in the 3D visualization and the values ​​given in the report look the same.

Next Topic

If a wall is drawn with the wall command on the beam and the wall load is entered in the beam settings, which one is taken into consider?

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