Thursday, March 31, 2011
Sunday, March 27, 2011
section through stands' opening
Since the cladding of the roof behaves only as a shelter, "a raincoat", efficiency is a key aspect to take into account in such a large surface. Also the concrete roof structure asks for light weight material.
We will use single layer ETFE foil to meet the requirements of transparency and light weight, and take advantage of the large span possibilities of the foil to reduce detailing and facilitate water tightness and water evacuation. This will be done by spanning the foil along the radial concrete beams and achieving the tension needed through pretensed strips in an arch shape. The self-cleaning property of ETFE also adds to the efficiency aspect.
The concept for the housing facades is to get a maximum comfort by increasing daylight.
Adaptability_1_The openings will be placed according to the daylight optimization analysis, which is specially relevant in the 3-layer housing (horizontal and twisting parts).
In the vertical housing, the main light source comes from the external surfaces of the ribbon. In the north side, this surfaces will consist of a large glass window in the edge of the housing box to allow a maximum of light inside.
Adaptability_2_In the south side we will have reconfiguration possibilites for energy saving in different climate scenarios still allowing a maximum of daylight. 3 layers: glass, sun shading and single layer ETFE.
operability of second ETFE skin
housing south facade
Friday, March 25, 2011
As u can see all the compressive stresses gradually increase towards a maximum towards the 'inner hoope'
The first image above shows the roof with a more elliptical inner ring, which resulted in a deflection of 850mm, after raising the height of the roof from 7m to 12m. A slight change in geometry, as suggested by Andrew, to make the inner ring as close to a circle as possible, and also a slight change in curvature, reduced the deflection to just 316mm. What a drastic change in deflection by only a small modification in geometry!!