Tornado community-level spatial damage prediction including pressure deficit modeling
Tornado community-level spatial damage prediction including pressure deficit modeling
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DOI：
10.1080/23789689.2017.1345254
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发表时间：
2017-01-01
影响因子：
5.9
通讯作者：
van de Lindt, John W.
中科院分区：
文献类型：
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作者：
Masoomi, Hassan;van de Lindt, John W.
根据以往龙卷风造成的破坏观察，龙卷风强度往往在中心最高，向外逐渐减弱，这与朗肯涡旋模型一致。在这项研究中，应用朗肯涡旋模型来模拟龙卷风产生的压力赤字，然后结合风速产生的压力来生成代表社区中典型住宅建筑存量的建筑的易损面。在缺乏数据的情况下，本文使用一个附加系数来考虑参与建筑物风荷载的不同压力亏损量，以便进行社区复原力研究。然而，值得注意的是，在单个建筑物的水平上，ASCE-7中使用的内部压力系数应该根据数据进行调整，以与美国目前的风工程方法保持一致。此外，基于美国近40年来龙卷风的历史统计数据，使用平均值模拟了情景龙卷风路径，并调查了代表社区住宅分区的木结构建筑群的空间破坏。本文提出的方法可以在空间上提供社区的损害信息，这是在社区水平上研究复原力的关键。
Based on the observation of damage from past tornadoes, tornado intensity is frequently the highest at the center and gradually decreases outward, which is consistent with a Rankine vortex model. In this study, the Rankine vortex model was applied to model the pressure deficit resulting from a tornado, and then combined with pressures resulting from wind velocity to develop fragility surfaces for buildings representative of the typical residential building stock in a community. In the absence of data, an additional coefficient is used herein to consider different amount of pressure deficit participating in wind loads on buildings to enable community resilience studies. However, it is duly noted that at the individual building level the internal pressure coefficient used in ASCE-7 should be adjusted based on data to be consistent with current wind engineering methods in the United States. Moreover, a scenario tornado path was modeled based on historical statistics of U.S. tornadoes over almost four decades using mean values, and spatial damage to a cluster of wood-frame buildings representative of a residential subdivision of a community was investigated. The methodology presented herein can provide damage information spatially over a community which is a key to studying resilience at the community-level.