Build a 17.3m x 8.5mx 21m hollow box on top of an 80 meter high tower block, easy right……..!
The problem was that’s what most people involved thought early in the project. What was overlooked was, it’s 80 metres up, with no other tall buildings for miles around, the wind load was greater than normal. Also being hollow and not sealed meant that the wind load was operating on both the inside and outside of the wall panel simultaneously, almost doubling the forces on the wall panels.
The consequence of all this the wall panels need more fasteners, at reduces pitches, fixed to a stronger support structure and steelwork frame. All adding extra cost.
You can see from the pictures that there is a single skin roof, this was not part of the original plan, however adding it reduced the internal wind loads on the wall panels, thus the support structure required strength was reduced, as (more importantly) was it’s cost.
