pg 29 – The Cloud Dome and Flower Dome. Paul Baker of Wilkinson Eyre Architects says: “The complementary yet distinct curved forms of the biomes are generated from the geometry of a hyperbolic curve, and so contain a large volume within a relatively small surface area. Not only does this geometry enable the structure to be optimised (allowing a lightweight, column-free interior), it works well environmentally, creating a stack-effect with warm air drawn up to stratify according to temperature within the space. The gentle forward tilt of the Flower Dome towards Marina Bay also shades the north façade so it never receives the full impact of the sun.”
pg 29 – The shape also introduced asymmetry which required some special engineering measures, such as pre-stressing the arches, particularly for the flatter Flower Dome. Here, the nose or apex of the hyperbolic surface was attached to the arches and tensioned, effectively prestressing the arches to form a rigid boundary. Between this boundary and the ground spans the large south gridshell.
The key to this is that the grid shell is braced along the line of the apexes, forming effectively an arched beam at right angles
to the arches, and this beam is then tensioned against the arches forming a ‘rigid’ (n.Q talk about the grid shell of eden)
pg 29 – The glazing was a key factor. Single glazing would be cheap and light, but there was no effective way to keep the solar gain down. The surface temperature of the external surface would frequently be below the dew point of the outdoor air resulting in a
more or less continual layer of condensation which would shroud the external surface. The answer was to create specialist
double-glazed units with a low-emissivity coating on the inner face of the units’ outer sheet of glass to reflect most of the infrared light. The inner sheet is laminated safety glass, with the added advantage that the protective layer of PVB (polyvinyl butyral) within the lamination also reflects most of the ultraviolet light. The units thereby let in about 65% of the incident daylight with only 35%
of the solar heat transferred. (NQ. refer to etfe with eden)