Year of construction
Short description of the replacement or dismantling
The X-Madrid dome is a landmark in the Alcorcón metropolitan landscape and the icon of the shopping center refurbishment. For the covering of the main exterior space an explicitly enthusiastic form is designed, collecting the activity of a public square that is designed as diaphanous, permeable to the breeze and sifted light: a metropolitan agora.
Name of the client/building owner
Function of building
Shops and stores
Degree of enclosure
Mediterranean - mild winters, dry hot summers
Number of layers
Type of application of the membrane
Primary function of the tensile structure
- Daylight gains
- Rain protection
- Space defining elements
- Sun protection
- Wind protection
This new centrality pole landmark is realised with a polygonal structure of steel beams and covered with a membrane of 75 meters in diameter and a free height of 25 meters, offering a leisure oriented technological aesthetic away from the plastic image traditionally associated with shopping malls.
The continuous surface is a membrane formed by 19 conoids tensioned by flying masts and a continuous sinuous perimeter tensioned by cables. The polygonal structure of beams increases the valence of its nodes as it approaches the supports and globally approaches a spherical cap which includes a cantilever beam that acts like a ring beam and extends the membrane as a shed collecting the visitors from the perimeter buildings.
The numerical model included both membrane and steel structure, where results from wind tunnel analysis where mapped.
Description of the environmental conditions
General comments, links
Material of the cover
Main dimensions and form
Covered surface (m2)
Maximum height (m)
Total width (m)
Form single element
Form entire structure
Duration of use
Temporary or permanent structure
Design lifespan in years