Force reduction factors for the seismic provisions of the National Building Code of Canada

Abstract

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur.Canadian Journal of Civil Engineering, 14, 4, pp. 447-454, 1987-08 Force reduction factors for the seismic provisions of the National Building Code of Canada Rainer, J. H. Ser TH1 N21dNatlonal Research Consell natlonal A derivation of force reduction factors for the seismic provisions of the National Building Code of Canada (NBCC), 1985, is presented. This includes the following: classification of seismic actions, applicable limit states, change in load factor, derivation of force reduction factors, and classification of structural configurations. Quantitative comparisons are made between the derived force reduction factors and the response modification factors of the Applied Technology Council and good agreement was found. It is suggested that seismic requirements should be considered as accidental actions with a load factor a, = 1.0. These results can form the basis for possible modifications to the 1985 NBCC seismic provisions.Key words: earthquake resistant structures, building code, loads, load factors.Une dCrivation des facteurs de rkduction de la force pour fes exigences du Code national du bltiment (1985) relatives aux sCismes est prCsentCe. Ceci inclut : classification de I'activitC sismique, Ctats limites applicables, modification du coefficient de charge, dCrivation des facteurs de rkduction de la force et classification des configurations des structures. Des comparaisons quantitatives sont effectuCes entre les facteurs de rkduction de la force dCrivCs et les facteurs de modification de la rCponse proposCs par le Applied Technology Council, et on a constat6 une bonne correspondance entre les deux. L'auteur suggbre de considCrer les exigences relatives aux sCismes comme des Cvtnements accidentels avec un coefficient de cx~ = 1.0. Ces rksultats peuvent servir de base k des modifications possibles des exigences du Code national du bltiment (1985)