Structural design

EN 1997-1 provides a short section on the structural design of spread foundations. It provides no guidance on the procedures for assessing the required amount or detailing of reinforcement in the concrete - this is dealt with by Eurocode 2.22

For stiff footings, Eurocode 7 recommends a linear distribution of ground stresses may be used to calculate bending moments and shear stresses in the foundation. For flexible rafts and strip foundations, an analysis based on a deforming continuum or an equivalent spring model is recommended.

When soil structure interaction is significant, numerical methods are likely to be required to assess total and differential settlements.

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