Can Buildings Be Designed to Resist Terrorist Attack?
In the aftermath of¹ the terrorist attack on the World Trade Center, structural engineers are trying hard to solve a question that a month ago would have been completely unthinkable: Can building be designed to withstand catastrophic blasts inflicted by terrorists?

Ten days after the terrorist attacks on the twin towers, structural engineers from the University at Buffalo and the Multidisciplinary Center for Earthquake Engineering Research (MCEER) headquartered at UB traveled to ground zero² as part of a project funded by the National Science Foundation. Visiting the site as part of MCEER reconnaissance visit, they spent two days beginning the task of formulating ideas about how to design such structures and to search for clues on how to do so in buildings that were damaged, but still are standing³.

“Our objective in visiting ground zero was to go and look at the buildings surrounding the World Trade Center, those buildings that are still standing, but that sustained damage4,” said M. Bruneau, Ph.D. “Our immediate hope is that we can develop a better understanding as to why those buildings remain standing, while our long-term goal is to see whether earthquake engineering technologies can be married to existing technologies5 to achieve enhanced performance of buildings6 in the event of terrorist attacks,” he added.

Photographs taken by the investigators demonstrate in startling detail7 the monumental damage inflicted on the World Trade Center towers and buildings in the vicinity. One building a block away from the towers remains standing, but was badly damaged. “This building is many meters away from the World Trade Center and yet we see a column there that used to be part of that building,” explained A. Whittaker, Ph.D. “The column became a missile that shot across the road, through the window and through the floor.”

The visit to the area also revealed some surprises, according to the engineers. For example, the floor framing8 system in one of the adjacent buildings was quite rugged, allowing floors that were pieced by tons of falling debris to remain intact9. “Highly redundant ductile framing systems may provide a simple, but robust strategy for blast resistance,” he added. Other strategies may include providing alternate paths for gravity loads in the event that a load-bearing column fails. “We also need a better understanding of the mechanism of collapse,” said A. Whittaker. “We need to find out what causes a building to collapse and how you can predict it.”

A. Reinhorn, Ph.D. noted that “earthquake shaking has led to the collapse of many buildings in the past. It induces dynamic response and extremely high stresses and deformations in structural components. Solutions developed for earthquake-resistant design may be directly applicable to blast engineering and terrorist-resistant design. Part of our mission now at UB is to transfer these solutions and to develop new ones where none exist at present.”

词汇 ：

aftermath  n. 后果，结果                     in the vicinity  附近

withstand v. 经受住                              debris n. 碎片

inflict v. 使遭受，施加                        intact adj. 未受损伤的，完整无缺的

reconnaissance n. 勘察，侦察             ductile adj. 可伸展的，易变形的

注释：

1．    In the aftermath of : 在….. （灾难性的事件发生——后的一段时间内。例：

In the aftermath of the Second World War: “二战”结束后的时期

2.       ground zero : 世界贸易中心（双塔）被毁现场

3.       buildings that were damaged, but still are standing. : 那些已损坏但未倒塌的建筑

4.       but that sustained damaged: 但遭到了损坏。Sustain: 蒙受，遭受（伤害或损失）

5.       whether earthquake engineering technologies can be married to existing technologies: 地震工程技术是否可以和现有的技术相结合。Be married to : 与…相结合。

6.       to achieve enhanced performance of buildings: 以提高建筑的性能