Seismic fragility assessment of nonstructural components in unreinforced clay brick masonry buildings

Summary The results of an investigation of the probability of earthquake damage to nonstructural unreinforced masonry (URM) components are presented. The components include parapets, chimneys, and out‐of‐plane loaded facades typical of low‐rise pre‐1940 construction in Australia and New Zealand. The...

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Bibliographic Details
Published in:Earthquake engineering & structural dynamics 2020-03, Vol.49 (3), p.285-300
Main Authors: Derakhshan, Hossein, Walsh, Kevin Q., Ingham, Jason M., Griffith, Michael C., Thambiratnam, David P.
Format: Article
Language:English
Subjects:
Aseismic buildings
Assessments
Brickwork
Buildings
chimney
Chimneys
Clay
clay brick
Collapse
Components
Data
Earthquake damage
Earthquakes
Fragility
Guidelines
HAZUS
Masonry
nonstructural
parapet
Probability theory
Qualitative analysis
rapid assessment
Risk assessment
Seismic activity
Seismic hazard
seismic risk
Stochasticity
Surveying
unreinforced masonry
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Summary:Summary The results of an investigation of the probability of earthquake damage to nonstructural unreinforced masonry (URM) components are presented. The components include parapets, chimneys, and out‐of‐plane loaded facades typical of low‐rise pre‐1940 construction in Australia and New Zealand. The study is based on a street survey of component geometry, in situ data on material strength, and simplified mechanical models. Uncertainties in capacity and demand were quantified based on, respectively, stochastic and deterministic approaches. The damage probabilities were compared with relevant guidelines and empirical damage data from three earthquakes. The study established a link between the qualitative damage states reported in existing guidelines and the quantitative URM component damage states. While some median damage state thresholds correlated well with the data from the guidelines, a larger dispersion value was found in the current study due to the large variations in component properties. Comparisons with empirical data suggest that the developed fragility data provide a realistic estimate of nonstructural component damage that occurred in similar buildings, with a reasonable level of conservatism. The outcome is useful in rapid assessment of the seismic risks due to nonstructural component collapse in URM precincts.
ISSN:0098-8847
1096-9845
DOI:10.1002/eqe.3238