@article {bnh-6336, title = {Seismic fragility assessment of nonstructural components in unreinforced clay brick masonry buildings}, journal = {Earthquake Engineering and Structural Dynamics}, year = {2019}, month = {12/2019}, abstract = {

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.

}, keywords = {Damage, earthquake, seismic risk, unreinforced masonry}, doi = { https://doi.org/10.1002/eqe.3238}, url = {https://onlinelibrary.wiley.com/doi/pdf/10.1002/eqe.3238}, author = {Hossein Derakhshan and Kevin Walsh and Jason Ingham and Michael Griffith and David Thambiratnam} } @article {bnh-6054, title = {Fragility and climate impact assessment of contemporary housing roof sheeting failure due to extreme wind}, journal = {Engineering Structures}, volume = {117}, year = {2018}, month = {09/2018}, pages = {464-475}, abstract = {

The paper describes a risk analysis of the economic impact of damage to metal roofing of a typical contemporary (new) Australian house subject to extreme wind loading. The failure modes considered are roof cladding and batten-to-truss connection failures, with the effect of defective construction also considered. Monte-Carlo simulation and structural reliability methods are used to stochastically model spatially varying pressure coefficients, roof component failure, and load re-distribution across the roof. This spatial reliability analysis enables fragility curves to be developed that relate likelihood and extent of roof cover loss to gust wind speed. The annual economic risk is up to 0.3\% of house replacement value. A typical house with construction defects increases economic risk more than sixfold when compared to the defect-free house. There is a 10\% chance that a changing climate will increase expected losses for houses in Brisbane and Melbourne by 6{\textendash}18\% over the next 50 years.

}, keywords = {Climate change, Damage, Fragility, Housing, Reliability, Wind load}, doi = {https://doi.org/10.1016/j.engstruct.2018.05.125}, url = {https://www.sciencedirect.com/science/article/pii/S0141029618302499}, author = {Mark Stewart and John Ginger and David Henderson and Paraic Ryan} }