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6. Modification of the site effect
Seismic protection of structures is usually achieved by sizing them to withstand the stresses caused by earthquakes. Another way of meeting seismic protection objectives for a structure is to act on the seismic movement to which it is subjected.
The aim of reducing the site effect is not necessarily to build a non-seismic building in a zone where seismic movement would be rendered zero. It is more important to consider situations where the design conditions of a structure or its equipment are slightly exceeded, and where it is more economical to act on the site effect than to adapt the structure or equipment.
This may be particularly the case for new structures built on a standardized basis, or for the re-evaluation of existing structures. Depending on the situation (figure
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Modification of the site effect
Conclusion
Bibliography
Software tools
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Cyberquake – This software models the response of soils to seismic shocks.
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Code-Aster – This is a free software package for numerical simulation of structural mechanics.
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Standards and norms
- Calcul des structures pour leur résistance au séisme. Partie 5 : Fondations, ouvrages de soutènements et aspects géotechnique. - NF EN 1998-5 AFNOR - septembre 2005
Regulations
Decree no. 2010-1254 of October 22, 2010 on seismic risk prevention.
Décret n° 2010-1255 du 22 octobre 2010 portant délimitation des zones de sismicité du territoire français.
Arrêté du 22 octobre 2010 relative à la classification et aux règles de constructions parasismiques applicables aux bâtiments de la classe dite "à risque normal" (Order of October 22, 2010 on the classification...
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