Seismic level of protection for building structures

Abstract

The seismic level of protection of building structures is concerned with the performance of the structures during strong seismic shaking. Performance expectations, for both functionality and life-safety objectives, are related to structural response parameters such as deflection, interstorey drift, and damage. This article describes a research framework for the evaluation of the level of protection and its potential application to the evaluation of the level of protection provided by the seismic provisions of the National Building Code of Canada (NBCC). This framework is described in terms of four distinct facets or dimensions, namely seismic hazard, seismic design, response and damage, and vulnerability. The evaluation of the NBCC level of protection for a variety of building types is discussed, including a detailed description of a pilot project on a six-storey reinforced concrete office frame structure. A brief description is given of other potential applications of the framework, including rehabilitation strategies for existing buildings, repair and replacement costs, and seismic design for low to moderate seismic hazard regions.