The main building structure is composed of a reinforced concrete frame consisting of circular columns and rectangular section main beams located around the floorplate, with post-tensioned rib beams spanning between the main beams. Around the perimeter of the larger floorplates, a series of smaller columns support flat slab floorplates. The main frame was designed to be self-stabilising during the construction period, while stability in the building’s permanent condition is achieved by means of a concrete encased steel stability cage which lines the atria and additionally provides lateral restraint for the cores and atrium glazing.
The offices (served space) and service towers (servant space) are clearly expressed as separate legible elements. The stairwells with yellow steel stairs and the main scenic lifts are fully glazed and are visible from the interior and exterior of the building.
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