“Tensegrity” is the name of a construction principle for stabilising systems that are based on the balance of pressure and pulling forces - with continuous pull coupled with discontinuous push resulting in integrity of tension. 

Used effectively this principle enables architects to push back established  boundaries, achieving structures that apparently defy gravity. A prime example of this is the support-free roof of a new velodrome in Aigle, Switzerland.

The elliptical membrane roof – with a diameter of 70m to 90m and total surface area of approximately 5,000m2 – is supported by a filigree steel construction that forms an imposing three-dimensional structure. Clearly divided into pressure and pulling elements, no reinforcing is used - with the resultant static equilibrium creating the outward impression of an optical illusion.

The membrane roof itself comprises two layers of PES/PVC material and represents one of the largest pneumatic structures of its kind. Through a sensor-controlled change in pressure between the membrane layers, it reacts flexibly to external weather conditions.

Architect: Grand Architects, Lausanne