Tornadoes cause damage to buildings and infrastructure. Providing the spatially varying tornado activities or tornado occurrence rate alone does not facilitate the tasks of checking and evaluating structures subjected to the tornado wind velocity hazard. In the present study, the estimation of the quantile of the tornado wind velocity hazard along the height for southern Ontario – a tornado-prone region in Canada – is carried out. For the assessment, a tornado occurrence rate model is developed by considering the reporting bias due to population density and by using the cloud-to-ground lightning flash density and thunderstorm days per year as the explanatory variables. Also, a simple equivalent along height tornado design wind profile for a vertical line-like structure is proposed by considering the bending moment and shear force along the height of the structure. Moreover, the concept of disaggregation analysis is employed to identify the scenario tornado wind profiles. The results indicate that the identified scenario wind profiles could be crudely bounded by using the rectangular wind profile and the power-law wind profile for synoptic winds, which are all hinged at the return period value of the tornado wind velocity at 10 ​m height.

龙卷风会损坏建筑物和基础设施。仅提供空间上变化的龙卷风活动或龙卷风发生率并不能促进检查和评估遭受龙卷风风速危害的结构的任务。在本研究中，对安大略省南部（加拿大容易发生龙卷风的地区）沿高度的龙卷风风速危害的分位数进行了估算。为了进行评估，通过考虑由于人口密度引起的报告偏差并以每年的云对地闪电闪光密度和每年的雷暴天数为解释变量，建立了龙卷风发生率模型。还，通过考虑沿结构高度的弯矩和剪切力，提出了一种用于垂直线状结构的沿高度龙卷风设计风廓线的简单等效方法。此外，采用分解分析的概念来识别龙卷风风廓线。结果表明，通过使用天气风的矩形风廓线和幂律风廓线可以粗略地确定所识别的情景风廓线，这些风廓线和风律风廓线都取决于10 m高度的龙卷风风速的返回期值。