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The 1975 Canadian Building Code for the design of reinforced concrete shear wall buildings in high seismic risk areas includes provisions that are new and significant. This paper critically examines some of these provisions, especially as they apply to cantilever shear walls. Clarifications in the definitions of curvature, member, and system ductilities are attempted. The relationship between curvature and system ductility is examined. Code provisions on allowable shear stress in the wall in the plastic hinge region and the provisions for the classification of the walls are discussed. Attention of the designer is drawn to some aspects of the code and the commentary that may result in structures of doubtful safety.

After briefly reviewing the need for earthquake resistant construction in Canada, this paper summarizes the development of the Canadian code provisions for seismic design 'loads.' Canadian code provisions for detailing earthquake resistant concrete buildings and the manner in which some of these provisions are applied in practice are then described. A statement of the specific Canadian problems that still need to be sulved conclude the paper.Apr6s un bref expose sur la nicessite de construire en vue de resister aux seismes au Canada, I'a~.ticle passe en revue les phases d'elaboration des prescriptions canadiennes relativesh I'evaluation des charges d'origine sismiqi~e il prendre encompte dans les calculs. Les auteurs decrivent alors d'abord les prescriptions des reglements touchant le fa~onnage et la disposition des armatures dans les b%tirnents B structure de beton antisismique, puis I'application de quelques-unes de ces prescriptions. L'article se termine par un inonce des probltmes proprcment canadiens qui attendent encore une solution en ce domaine.[Tmdui t par la revue]Can. J. Civ. Eng., 5,427-441 (1978)