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3. Definition of forces applied to foundations
The ductility principle is based on the fact that, during a given earthquake, the displacements obtained when the structure undergoes plastic deformation are of the same order as those obtained from an elastic analysis (isodisplacement hypothesis). It is then possible to opt for plastic (non-linear) behavior by dividing the forces obtained from the elastic analysis by a coefficient q, known as the "behavior" coefficient, the value of which depends on the element's capacity to deform in the plastic domain. When q is between 1 and 1.5, the structure is designed to remain in the limited post-elastic domain.
In common cases, the load descent is determined by considering supports locked in translation in all three directions, using q = 1.5. In this case, the design engineer is asked to supply the force torsorsors at the head of the foundation in all directions, calculated...
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Definition of forces applied to foundations
Justification of shallow foundations
Bibliography
Standards and norms
- Eurocode 7: geotechnical design – Part 1: General rules (Classification number: P94-251-1). - NF EN 1997-1 - (juin 2005)
- Eurocode 7 – Geotechnical calculations – Part 1: General rules – National Annex to NF EN 1997-1:2005 (Classification number: P94-251-1/NA). - NF EN 1997-1/NA - (septembre 2006)
- Eurocode 7: geotechnical design – Part 2: Site reconnaissance and testing (Classification number: P94-252)....
Regulations
Arrêté du 22 octobre 2010 and Arrêté du 19 juillet 2011 modifiant l'arrêté du 22 octobre 2010 relatif à la classification et aux règles de construction parasismique applicables aux bâtiments de la classe dite " à risque normal ".
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