Aspect House, Bridge Street, Peterborough
In the heart of Peterborough town centre, 130 new residential units have been added above an existing two-storey commercial building which remained operational throughout.
The existing post-war structure uses internal steel framing and load bearing masonry to the perimeter, and has been heavily modified and extended in recent years.
A full historic desk study and extensive site survey were used to form our structural analysis and build a 3D model of Bridge Street.
Access to the ground floor was prohibited and no structure could pass through the existing first floor slab, requiring reuse of the existing foundations which were balanced with historic values. In locations where the load was increased, piles were tested and back analysed.
Converting a historic masonry structure from two- to five-storeys required a novel hanging frame to be designed along one of the perimeter walls in case of disproportionate collapse. Large section sizes were reduced through the design of a two-storey Vierendeel truss being constructed from the existing internal column bays.