translate English to French: The seismic loading provisions included in the 1985 edition of the National Building Code of Canada simulate the dynamic response of structures using a seismic response factor, which has three branches depending upon the relationship between the velocity-related seismic zone Zv and the acceleration-related zone Za.
Les exigences relatives aux charges sismiques de l'édition 1985 du Code national du bâtiment du Canada simulent la réponse dynamique des structures en utilisant un coefficient de réponse sismique ayant trois composantes, selon la relation entre la zone sismique de vitesse Zv et la zone sismique d'accélération Za.