![]() Limited historical drawings and papers were available, and therefore, non-destructive testing and careful intrusive investigations were used to obtain more information on the as-built details. This paper explores in detail the steps taken to assess the relatively delicate existing roof structure for the change in loading and future movements in both the temporary and permanent conditions and the resulting innovative strengthening, repair and temporary works required. In order to make the space functional, the interior and foundations needed to be demolished and the entire 3100 m 2, 2000 t roof held up 20 m above ground temporarily while the new structure was constructed underneath. After being unoccupied for a decade, in 2012, the Design Museum announced its plans to move into and redevelop the building. ![]() ![]() The Grade II*-listed 1960s roof to the former Commonwealth Institute consists of a central post-tensioned concrete hyperbolic paraboloid shell, typically only 75 mm thick, and is one of the few examples of large-scale concrete shell structures in the UK.
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