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TitleMethodology for rapid assessment of seismic damage to buildings in Canadian settings
AuthorAbo-El-Ezz, A; Nollet, M J; Nastev, M
SourceGeological Survey of Canada, Open File 7450, 2014, 41 pages,
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
File formatpdf
ProvinceBritish Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Lat/Long WENS-141.0000 -50.0000 90.0000 41.7500
Subjectsgeophysics; engineering geology; seismicity; seismic zones; seismic risk; earthquakes; earthquake risk; earthquake studies; earthquake damage; health hazards; building codes; Hazus; geological hazards
Illustrationstables; flow charts; plots; histograms
Natural Resources Canada Library - Ottawa (Earth Sciences)
ProgramQuantitative risk assessment, Public Safety Geoscience
Released2014 04 17
AbstractA framework for rapid risk assessment is proposed considering local inventory of the building stock, definition of the seismic hazard and evaluation of the respective structural vulnerabilities. Structural vulnerability represents the central component of the framework and is based on the concept of fragility functions which combine the intensity of the seismic motion to the expected damage for a given structural type. This report documents the development of a rapid procedure for the seismic risk assessment of buildings. The procedure was first developed using the structural characteristics of the existing buildings in Old Quebec City with an emphasis to historic stone masonry buildings. Still it can be applied to existing or planned buildings of any structural type incorporating respective: (1) capacity curves which characterize the nonlinear behaviour of a building (exposure); (2) displacement fragility curves which represent the probability of exceedance of specified damage state under various levels of structural response (vulnerability); and (3) site specific response spectra used to estimate the structural demand for a series of earthquake magnitude-distance combinations (hazard). A modified approach to the capacity spectrum method is proposed for evaluation of the expected damage as opposed to the usual iterative procedure for the displacement response, e.g., the one implemented in the well known U.S. Federal Emergency Management Agency - FEMA's Hazus software. The developed methodology revealed to be a powerful tool for rapid assessment of seismic risk of a single building type or a regional risk assessment as it significantly reduces the computation time. It was validated through seismic damage assessment of 1220 buildings in Old Quebec City for a scenario event of M6.2 and distance 15km. The results were compared to those obtained by applying the Hazus software for the same input parameters (capacity curves and displacement based fragility functions) and showed negligible differences.
Summary(Plain Language Summary, not published)
Earthquake hazards are low-probability events that occur without notice. The seismic risk assessment process considers hypothetical or already occurred historic hazard scenarios, inventory of the exposure and respective vulnerabilities in the study area. The created risk libraries are used for long term mitigation through adequate land use planning and for emergency management through actions that could be taken immediately to minimize loss of life and property. However, the standard risk assessment tools, such as Hazus, take time to implement and show results, and highly trained professionals are essential. In addition, the multiple combinations of potential earthquakes, ever growing exposure and vulnerabilities impose regular updating of the conducted scenarios. Hence the need to perform a rapid risk assessment following an earthquake disaster so that the emergency managers can inform their decision-making in real time.