World Trade Center Post-Disaster Reconnaisance and Perishable Structural Engineering Data Collection

2001年9月11日，世贸中心双子塔因恐怖袭击倒塌。这两座110层的建筑采用钢管钢结构，是世界第五和第六高的建筑，高度约为1365英尺。这一犯罪行为造成的悲剧性坍塌将需要对飞机最初受到撞击的结构以及随后的激烈火灾进行全面分析。毫无疑问，今后将进行这样的分析，以确定坍塌和破坏序列的原因(S)，以改进新建筑的设计和改造现有结构。这项研究将需要关于塔楼、实际建成的钢连接和构件以及楼板系统中使用的材料的机械性能的可靠数据。这个SGER的目标是进行灾后侦察和收集易腐烂的数据。具体地说，将收集稍后可用于确定其属性的材料和结构构件和连接的样本。特别令人感兴趣的是从受到喷气燃料热量和/或飞机撞击严重影响的地区收集钢材样本。PI正在与劳伦斯·利弗莫尔国家实验室的大卫·麦卡伦合作，麦卡伦提供大型结构系统的计算力学、建模和分析方面的专业知识。他还与马里兰大学的弗雷德里克·莫雷尔合作，后者正在收集世贸中心消防工程方面的易腐烂数据。总而言之，在这些项目中获得的数据将对未来对世贸中心倒塌的分析至关重要。

On September 11, 2001, World Trade Center towers collapsed because of a terrorist attack. The twin 110-story buildings had tube steel structures steel and were the fifth and sixth tallest buildings in the world with a height of about 1365 feet. The tragic collapse due to this criminal act will require comprehensive analyses of the structure subjected to initial impact of airplane as well as the intense fire that followed. Such analyses no-doubt will be conducted in the future to establish the cause(s) of the collapse and failure sequence in order to improve design of new buildings and retrofit existing structures. The studies will need reliable data on mechanical properties of materials used in the towers, actual as-built steel connections and members as well as floor systems. The objective of this SGER is to conduct post-disaster reconnaissance and collection of perishable data. Specifically, samples of material and structural members and connections that later can be used to establish their properties will be collected. Of particular interest is to collect samples of steel from areas that were heavily affected by heat of the jet fuel and/or impact of the planes. The PI is collaborating with David McCallen of the Lawrence Livermore National Laboratory, who is providing expertise in computational mechanics, modeling and analysis of large structural systems. He is also collaborating with Frederick Mowrer of the University of Maryland who is collecting perishable data on the fire protection engineering aspects of the WTC. Together, the data obtained in these projects will be of critical importance to future analyses of the WTC collapses.