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Wind and rain losses for metal-roofed contemporary houses subjected to non-cyclonic windstorms
Structural Safety ( IF 5.8 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.strusafe.2020.101979
Hao Qin , Mark G. Stewart

Abstract Severe windstorms cause millions in losses annually for housing in Southeast Australia that has more than half of Australia’s population. The risk assessment for housing in these non-cyclonic regions is the key to assessing the cost-effectiveness of relevant wind mitigation measures to reduce economic losses. This study develops a probabilistic risk assessment framework to evaluate the wind and rain losses for new Australian contemporary houses correctly built and inspected to current standards that are subjected to non-cyclonic windstorms, which integrates the hazard modelling for extreme wind and associated rainfall, reliability-based wind damage assessment, rainwater intrusion evaluation and economic loss modelling. The risk analysis was conducted for metal-roofed contemporary houses in Brisbane and Melbourne, and the efficacy of the proposed risk assessment framework was demonstrated by comparing with inferred insurance loss data. It was found that rainwater damage to building interior and contents is the major contributor to annual expected economic losses associated with windstorms, whereas wind damage to roof cladding and windows comprises a small portion of annual losses. Preliminary model outputs also indicate that houses in Brisbane are generally subject to more losses than houses in Melbourne. However, modelling assumptions that lead to these results have yet been fully validated.

中文翻译:

受非气旋风暴影响的金属屋顶现代房屋的风和雨损失

摘要 澳大利亚东南部拥有超过一半的澳大利亚人口,严重的风暴每年都会造成数百万的住房损失。对这些非气旋地区的住房进行风险评估是评估相关减风措施的成本效益以减少经济损失的关键。本研究开发了一个概率风险评估框架,以评估正确建造并按照当前标准进行检查的新澳大利亚现代房屋的风和雨损失,这些房屋受到非气旋风暴的影响,该框架集成了极端风和相关降雨的危害模型、可靠性-基于风害评估、雨水入侵评估和经济损失建模。风险分析是针对布里斯班和墨尔本的金属屋顶现代房屋进行的,通过与推断的保险损失数据进行比较,证明了所提出的风险评估框架的有效性。研究发现,雨水对建筑物内部和内容物的破坏是与风暴相关的年度预期经济损失的主要原因,而对屋顶覆层和窗户的风破坏只占年度损失的一小部分。初步模型输出还表明,布里斯班的房屋通常比墨尔本的房屋遭受更多损失。然而,导致这些结果的建模假设尚未得到充分验证。而屋顶覆层和窗户的风损只占年度损失的一小部分。初步模型输出还表明,布里斯班的房屋通常比墨尔本的房屋遭受更多损失。然而,导致这些结果的建模假设尚未得到充分验证。而屋顶覆层和窗户的风损只占年度损失的一小部分。初步模型输出还表明,布里斯班的房屋通常比墨尔本的房屋遭受更多损失。然而,导致这些结果的建模假设尚未得到充分验证。
更新日期:2020-09-01
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