Early Access Reconnaissance Report (EARR)

In the early morning hours of March 3, 2020, a strong tornado struck the City of Nashville and the surrounding metropolitan region with estimated maximum wind speeds of 165 mph. The tornado passed through Nashville and continued east for 53 miles, impacting the communities of Donelson, Mt. Juliet and Lebanon before lifting. The same storm system then produced a second tornado that struck Cookeville, TN with estimated wind speeds of 175 mph. The Nashville tornado was the third tornado that passed through the Five Points area of Nashville. Damage was reported across a diverse cross-section of buildings spanning a number of communities: Camden, Germantown/North Nashville, East Nashville/Five Points, Donelson, Mt. Juliet, Lebanon and Cookeville. Exposure of an urban metro area to this series of tornadoes resulted in significant impacts to power infrastructure and building performance ranging from loss of roof cover and broken windows to complete destruction. Affected typologies and building classes include single and multi-family wood framed homes, commercial construction (ranging from big box stores down to smaller restaurants/retail shops), airport and industrial buildings, and a number of schools. More gravely, these nocturnal tornadoes claimed two dozen lives and injured hundreds more. Given the loss of life and property in this event and the fact that the Nashville tornado sequence impacted an urban area with diverse building classes and typologies, this event offers an opportunity to advance our knowledge of structural resistance to strong winds, particularly given that new construction was among the inventory significantly damaged. This project encompasses the products of StEER's response to this event: Preliminary Virtual Reconnaissance Report (PVRR), Early Access Reconnaissance Report (EARR) and Curated Dataset.

2020年3月3日凌晨，一场强龙卷风袭击纳什维尔市及周边大都市区，经测算其最大风速达165英里每小时。该龙卷风途经纳什维尔后向东行进53英里，先后影响多纳尔森、朱丽叶山及黎巴嫩地区后消散。同一风暴系统随后催生了第二场龙卷风，袭击田纳西州库克维尔地区，经测算风速达175英里每小时。此次袭击纳什维尔的龙卷风是途经该市五点区的第三场龙卷风。据报告，卡姆登、日耳曼敦/北纳什维尔、东纳什维尔/五点区、多纳尔森、朱丽叶山、黎巴嫩及库克维尔等多个社区的各类建筑均出现不同程度损毁。这座城市大都市区遭遇系列龙卷风袭击后，电力基础设施与建筑性能均遭受严重影响，受损情形涵盖屋面脱落、玻璃窗破碎直至完全损毁等不同程度。受影响的建筑类型与类别包括独栋与多户木结构住宅、商业建筑（涵盖大型量贩店至小型餐厅/零售商铺）、机场及工业建筑，以及多所学校。更为严峻的是，这些夜间龙卷风造成24人死亡、数百人受伤。鉴于此次事件造成的生命与财产损失，以及纳什维尔系列龙卷风袭击了建筑类型与类别多样的城区这一背景，该事件为我们深化强风作用下结构抗灾性能的认知提供了契机，尤其是在新建建筑同样位列严重受损建筑清单之中的情况下。本项目包含了StEER针对此次事件所产出的成果：初步虚拟侦察报告（Preliminary Virtual Reconnaissance Report，缩写PVRR）、早期获取侦察报告（Early Access Reconnaissance Report，缩写EARR）以及精选数据集。