This forty storey steel framed composite structure in the heart of London's financial district, has a surprisingly small footprint and access for the delivery of construction materials was available only from a narrow street. Each floor is circular and comprises an outer ring with equally spaced radial beams plus a central service core constructed with irregularly spaced beams, all supporting steel decking based composite floor slabs. The size of the core is constant, but the outer floors vary in diameter at each level.

      Download PDF