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共用题干 Can Buildings Be Designed to Resist Terrorist Attack?In the aftermath o...

admin2020-12-24  30
问题 共用题干
Can Buildings Be Designed to Resist Terrorist Attack?
In the aftermath of 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 buildings be designed to withstand catastrophic blasts（爆炸）inflicted by terrorists?
Ten days after the terrorist attacks on the,twin towers,stmctural engineers from the University at Buffalo and the Multidisciplinary Center for Earthquake Engineering.Research(MCEER)headquartered（总部在某地）atUB traveled to ground zero as part of a project funded场the National Science Foundation.Visiting the site as part of an MCEER reconnaissance（事先考查）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 standing.
"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 damage," 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 technologies to achieve enhanced performance of buildings in the event of terrorist attacks,"he added.
Photographs taken by the investigators demonstrate in startling (惊人的）detail 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 framing system in one of the adjacent buildings was quite rugged,allowing floors that were pierced by tons of falling debris to remain intact." Highly redundant ductile（有延展性的）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."
选项 A surprising discovery made by the investigators during their visit to ground zero is that______.
A:floors in the adjacent building remain undamaged
B:some floor framing systems demonstrate resistance to explosion
C:simple floor framing systems are more blast resistant
D:floors in one of the adjacent buildings were pierced by tons of debris
答案B
解析世贸中心受到恐怖袭击之后，结构工程师努力解决是否能通过设计使建筑具有抵御恐怖袭击的性能这个一个月前人们从未想过的问题。这是第一段的主要内容。由此可见，在恐怖袭击发生前，没有人想过这样的问题。
第三段第一句表明，M.Bruneau一行访查世界贸易中心的遗址，是为了查看世界贸易中心周围的那些虽遭受损坏但依然挺立的建筑；第三段第二句表明，M.Bruneau一行希望能更好地了解那些建筑仍然挺立的原因。由此可知，美国国家科学基金会资助这个项目，目的是找出一些建筑能够经受住爆炸的原因。
第四段第三句“This building is many meters away from the World Trade Center and yet wesee a column there that used to be part of that building…”中的“that building"，指的是上一句中的"One building a block away from the towers”。
选项A不是答案，因为第五段第二句说“…allowing floors that were pierced by …”第五段第三句表明，C项不是文章表达的内容。D项在第五段第二句中被提到，但不是a surprisingdiscovery。根据第五段前三句可知，B项是正确答案。rugged意思是“结实的”。
选项A的内容是正确的，根据是最后一段最后一句“…develop new ones…"。选项B和C的内容也是正确的，根据是本段最后两句（关键词是applicable ) 只有D项表述错误，因为Reinhorn没有提到blast engineering emerges as a new branch of science 。
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