2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference


Title
The use of HazCan to assess the earthquake risk of residential buildings in Montreal, Canada


Author(s)
Dr. Philippe Rosset, McGill University
Mr. Morley Kert, University McGill
Mrs. Youance Suze, Département de génie de la construction, École de technologie supérieure, Université du Québec
Dr. Nollet Marie-José, École de technologie supérieure (Presenter)
Dr. Luc Chouinard, McGill University
Abstract

Montreal is the second most vulnerable city for earthquakes, after Vancouver, considering the level of the seismic hazard level and the population. A study, supported by the Ministère de la Sécurité Publique du Québec, has been conducted to assess the losses to residential buildings for several earthquake scenarios. Population and building data have been collected for each of the 3'201 dissemination areas forming the Montreal Island. Inventory of the buildings in terms of occupancy and construction types uses mainly the information for about 350'000 buildings available in the 2016 municipal property roll of Montreal. Wood-frame buildings counts for 79% of the total, masonry for 18%, steel frame and reinforced concrete sharing the last 3%. Ground motion prediction equations for Eastern North America are applied for the different seismic scenarios taking into account microzonation in terms of Vs30 derived soil classes. Depending on the scenario, damage ranges from 25 to 60% of the building stock, severely damaged and collapsed buildings representing 2 to 12% of the total. Non-structural damage accounts for 80% of the total losses. Generally, masonry houses built before the 20th century account for most of the damage as wood-frame structure perform best. The total losses vary between 1 and 12% of the portfolio for residential houses depending on the selected scenario. Preliminary estimates of the amount of debris generated by scenario earthquakes range from 0.6 to 6 million tons, with brick and wood debris representing approximately 60% of the total.