1 Professor, Department of Construction Engineering, École de technologie supérieure, Université du Québec, Montréal, QC, H3C 1K3, Canada, marie-jose.nollet@etsmtl.ca
2 Ph.D. Candidate, Department of Construction Engineering, École de technologie supérieure, Université du Québec, Montréal, QC, H3C 1K3, Canada,
ahmad.abo-el-ezz.1@ens.etsmtl.ca
3 Research Scientist, Geological Survey of Canada, Natural Resources Canada, 490, Rue de la Couronne, Québec, QC, G1K 9A9, Canada, miroslav.nastev@RNCan-NRCan.gc.ca
ABSTRACT
During the 1988 magnitude 5.9 (Mw) Saguenay Earthquake, most of the damages were observed to unreinforced masonry structures even in Québec City and Montréal, located more than 340 km from the epicenter. Recent earthquakes, such as the Canterbury earthquake, have emphasized the need for pre-disaster seismic risk assessment of existing unreinforced masonry. This paper presents a review of observed typical damages to unreinforced masonry from past earthquakes in the province of Québec and an inventory and structural characterisation of existing typical unreinforced stone masonry structures. This characterisation was used to develop fragility functions for typical stone masonry buildings for quantitative assessment of earthquake risk at regional scale. It also presents the results of the seismic vulnerability assessment of 1220 buildings, mainly pre-code unreinforced brick and stone masonry, in Old Québec City, a UNESCO heritage city. Results for a scenario event of magnitude 6.2 at distance 15 km (M6.2R15) indicate that approximately 39% of the stone masonry buildings and 33% of the brick masonry buildings would suffer various levels of damage.
KEYWORDS: unreinforced masonry, stone, seismic risk, uncertainties
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