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而倒塌。这两座110层的建筑采用钢管结构，是世界上第五和第六高的建筑，高度约为1365英尺。由于这一犯罪行为造成的悲剧性倒塌，将需要对遭受飞机最初撞击以及随后的强烈火灾的结构进行全面分析。毫无疑问，未来将进行此类分析，以确定倒塌和破坏顺序的原因，以便改进新建筑物的设计和改造现有结构。这些研究将需要有关塔楼所用材料、实际建成的钢连接和构件以及楼板系统的机械性能的可靠数据。SGER的目标是进行灾后侦察和易腐数据的收集。具体来说，将收集材料和结构成员以及连接的样品，这些样品以后可以用来确定它们的特性。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铁样本。PI与劳伦斯利弗莫尔国家实验室的David McCallen合作，后者在大型结构系统的计算力学、建模和分析方面提供专业知识。他还与马里兰大学的弗雷德里克·莫勒（Frederick Mowrer）合作，后者正在收集世贸中心消防工程方面的易损数据。总之，从这些项目中获得的数据将对未来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.