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首页> 外文期刊>Journal of structural engineering >Quantitative Insight into Rational Tornado Design Wind Speeds for Residential Wood-Frame Structures Using Fragility Approach
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Quantitative Insight into Rational Tornado Design Wind Speeds for Residential Wood-Frame Structures Using Fragility Approach

机译：使用易碎性方法定量分析住宅木结构合理的龙卷风设计风速

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摘要

Tornadoes are an extremely devastating natural hazard that have significant consequences but are currently not considered in the structural design codes due to their low probability of occurrence. These low-occurrence high-consequence events have been studied but not to the extent of other natural hazards. This paper presents the results of a study whose objective was to provide quantitative insight into a rational design wind speed for tornadoes considering the current state-of-practice in construction methods. Five archetype buildings were selected to be representative of the typical residential structure design space in tornado-prone regions of the United States. Wind analysis was performed using the ASCE standard loading in combination with modification factors for tornadic winds developed from the available literature. Fragilities were developed for the main components along the vertical load path that included roof sheathing and roof-to-wall connection. Then, system fragilities for the combined load path of these two potential failure modes were formulated as a series system. The results of the fragility analysis were compared with the Enhanced Fujita (EF) scale ratings for residential construction and were then used to identify which critical component had a greater effect on system performance. Finally, it was concluded that, if proper foundation anchorage is provided, it is possible to design a residential wood-frame structure for winds from an EF1 tornado, possibly an EF2, but not an EF3, using conventional construction methods including hurricane clips.
机译：龙卷风是一种极具破坏性的自然灾害，具有重大后果，但由于其发生的可能性低，因此目前未在结构设计规范中予以考虑。这些低发生率高后果事件已得到研究，但未达到其他自然灾害的程度。本文介绍了一项研究的结果，该研究的目的是考虑到当前施工方法的实际情况，为龙卷风的合理设计风速提供定量的见解。选择了五座原型建筑来代表美国龙卷风多发地区的典型住宅结构设计空间。风速分析是使用ASCE标准载荷结合从现有文献中得出的针对飓风的修正因子进行的。沿垂直载荷路径的主要零部件开发了易碎性，包括屋顶覆层和屋顶到墙壁的连接。然后，将这两种潜在故障模式的组合载荷路径的系统脆弱性表述为串联系统。将脆弱性分析的结果与住宅建筑的增强藤田（EF）等级评定进行比较，然后将其用于确定哪个关键组件对系统性能的影响更大。最后，得出的结论是，如果提供适当的地基锚固，则可以使用包括飓风夹在内的常规施工方法，为来自EF1龙卷风（可能是EF2，而不是EF3）的风设计住宅木结构。

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