The invention consists of an ultralight structural element of pneumatic type known in the technical field as Tensairity and introduces as new elements, with respect to state of the art, wire ropes with superelastic and shape memory behavior together with a tensioning control apparatus of the ropes. The resulting structure is active and very damped, able to vary the mechanical properties in real time to support dynamic forcing with high performance. The applications belong to civil, industrial and aerospace context: long-span roofs, bridges, aerostats, airships, stratospheric platforms and space habitat.