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Education The rotunda takes shape obviously ruled out as cross bracing would college’s redevelopment; the adding of an steelwork to the original steel was a relatively have obscured the glazed elevations, while extra floor to two teaching wings. Both of straightforward procedure. However the old internally there was no space. these wings are identical and situated either steel was concrete encased and some of this “All beam to column connections are side of the college’s library. Initially the work was stripped away making the old columns moment connections in two directions, and consisted of the old copper roofs being taken lighter, prior to the new frame being added. these are all secreted within the floor zone,” off which then allowed steelwork, to form “It was necessary to remove some of the explains Chris Lyons, Hambleton Partnership a new storey, to be erected. This was then concrete encasement to save weight, while Project Engineer. “This was the only solution, completed with the portal frame roof which the steel frame and portal roof were both of a so as not to spoil the exposed columns with was clad in copper to match the surrounding lightweight design,” adds Mr Lyons. welded or bolted connections.” college rooftops. A timber decking has been used instead of Along the back elevation of the rotunda, Before this a thorough survey of the a more traditional concrete floor, again this which abuts the existing building, there is a existing buildings was undertaken and has minimised the loads being transferred full height atrium containing two scenic lifts. subsequently it was decided that the new down to the original foundations. At each floor level a bridge spans the atrium floors had to be as light as possible. Using The project is scheduled for completion in connecting the rotunda to the rest of the steel was the answer as connecting new February 2011. college. The lift shafts are constructed from The top floor of the 200 × 200 box sections, and these members rotunda steps back to tie-back into the existing building. form a balcony “The rotunda is basically an independent structure, with its own stability - via the moment connections. The lift shafts are the only point where the new steel connects back into the existing building’s steelwork,” explains Mr Lyons. As well as the rotunda, steelwork has played a major role in another aspect of the The old steel was concrete encased and some of this was stripped away making the old columns lighter, prior to the new frame being added October 10 17NSC


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