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.

中文翻译：

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无筋粘土砖砌体建筑非结构构件的抗震脆弱性评估

介绍了对非结构无钢筋砌体 (URM) 组件发生地震损坏概率的调查结果。这些组件包括护墙、烟囱和平面外加载的外墙，这些外墙是澳大利亚和新西兰 1940 年前低层建筑的典型特征。该研究基于部件几何形状的街道调查、材料强度的原位数据和简化的机械模型。容量和需求的不确定性分别基于随机和确定性方法进行量化。将损坏概率与相关指南和来自三个地震的经验损坏数据进行了比较。该研究在现有指南中报告的定性损坏状态与定量 URM 组件损坏状态之间建立了联系。虽然一些中值损伤状态阈值与指南中的数据相关性很好，但由于组件特性的巨大变化，在当前的研究中发现了更大的离散值。与经验数据的比较表明，开发的脆弱性数据提供了对类似建筑物中发生的非结构部件损坏的现实估计，具有合理的保守性。该结果可用于快速评估 URM 区域非结构组件倒塌引起的地震风险。具有合理的保守性。该结果可用于快速评估 URM 区域非结构组件倒塌引起的地震风险。具有合理的保守性。该结果可用于快速评估 URM 区域非结构组件倒塌引起的地震风险。