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Award-winning papers in 2021

机译：2021年获奖论文

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The Grade II*-listed 1960s roof to the former Commonwealth Instituteconsists of a central post-tensioned concrete hyperbolic paraboloid shell,typically only 75 mm thick, and is one of the few examples of large-scaleconcrete shell structures in the UK. After being unoccupied for a decade,in 2012, the Design Museum announced its plans to move into and redevelopthe building. In order to make the space functional, the interior andfoundations needed to be demolished and the entire 3100 m2, 2000 t roofheld up 20 m above ground temporarily while the new structure was constructedunderneath. This paper explores in detail the steps taken to assessthe relatively delicate existing roof structure for the change in loading andfuture movements in both the temporary and permanent conditions and theresulting innovative strengthening, repair and temporary works required.Limited historical drawings and papers were available, and therefore, nondestructivetesting and careful intrusive investigations were used to obtainmore information on the as-built details. In order to determine the structuralbehaviour, hand calculations were conducted to back-calculate the originaldesign intent, and computer modelling was used to conduct sensitivityanalyses of the load paths.
机译：前英联邦研究所的 1960 年代二级*屋顶由中央后张混凝土双曲抛物面壳组成，通常只有 75 毫米厚，是英国为数不多的大型混凝土壳结构之一。在无人居住十年后，2012年，设计博物馆宣布计划搬入并重新开发该建筑。为了使空间功能正常，需要拆除内部和地基，整个 3100 m2、2000 t 的屋顶暂时高出地面 20 m，同时在下面建造新结构。本文详细探讨了为评估相对脆弱的现有屋顶结构所采取的步骤，以应对临时和永久条件下的荷载变化和未来运动，以及由此产生的创新加固、维修和临时工程。可用的历史图纸和文件有限，因此，使用无损检测和仔细的侵入性调查来获得有关竣工细节的更多信息。为了确定结构行为，进行了手工计算以反向计算原始设计意图，并使用计算机建模对荷载路径进行敏感性分析。

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