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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. The eccentricities ex and ey are considered separately.

In the case of rectangular foundations, the eccentricity of the load resultant may not exceed 1/3 of the side length; in the case of circular foundations, it may not exceed 0.6 of the radius. If the eccentricity is beyond the mentioned limit values, special precautions must be taken according to Clause 2.4.2.

A technical illustration to explain the maximum allowable eccentricities for maintaining the core widths for geotechnical design.
Illustration of 1st and 2nd Core Widths

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

Mark 2: The limitation of the second core width is represented by an 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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