Development of a Period Database for Buildings in Montreal Using Ambient Vibrations

Abstract eng:
The fundamental period formulae in the National Building Code of Canada 2005 (NBCC 2005) are based on a database comprised of structures in California whose fundamental periods were measured during several earthquakes. Since each earthquake produced ground motions of different amplitudes at each site, and since the fundamental period varies with the excitation amplitude, this database is somewhat inconsistent. Further, the empirical formulae fit these data quite poorly, and past research has suggested that care be exercised before using the California period data in other parts of the world. This paper will discuss an ongoing research project which aims to develop a period database for the city of Montreal, Canada, using ambient vibration measurements and the Frequency Domain Decomposition method. This database will represent a consistent data set for the low-amplitude fundamental periods of buildings in Montreal, which will be used to evaluate the NBCC 2005 formulae, and develop improved period equations. This database will also be used for seismic vulnerability studies in Montreal and as a pre-damage benchmark for the measured buildings.

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