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Hedi Boukraa, B.Sc.
2024-07-11
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Loads with large eccentricities

According to EN 1997-1 [1] 6.5.4, no special measures are to be taken if the following applies in general for a rectangular base:

ex,max=wx3
ey,max=wy3
Loads with Large Eccentricities According to EN 1997-1 6.5.4

The formulas refer to the limitation of 2. Core width, which is elliptical in shape. Dabei werden die Exzentrizitäten ex und ey separat betrachtet.

Bei Rechteckfundamenten darf demnach die Ausmittigkeit der Lastresultierenden 1/3 der Seitenlänge, bei Kreisfundamenten 0,6 des Radius nicht überschreiten. Liegt die Ausmittigkeit jenseits der genannten Grenzwerte, sind gemäß Abschnitt 2.4.2 besondere Vorkehrungen zu treffen.

Technical illustration explaining maximum allowable eccentricities to maintain core widths for geotechnical proof.
Illustration of 1st and 2nd Shear Span

Mark 1 : The limitation of the first The core width is represented by a rhombus.

Mark 2 : The limitation of the second Core width is represented by ellipse.

Mark 3 : The resultant's point of application is the point at which the entire resulting load acts on the foundation base.

References
  1. European Committee for Standardization (CEN). (2014). Eurocode 7: Geotechnical Design – Part 1: General Rules, EN 1997-1:2014-03. Berlin: Beuth Verlag GmbH.
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