Largest dome-shaped tensile structure

The largest dome-shaped tensile structure is The O2 with a diameter of 365 m (1,181 ft), an internal diameter of 320 m (1,050 ft) and a roof height of 50 m (164 ft), in Greenwich, London, UK.

A tensile structure is one in which the bulk of the structural elements are under tension, rather than compression. Although not a true 'dome' in the sense that it is not self-supporting The O2 (formerly known as the Millennium Dome) is the largest dome-shaped tensile structure. The inside of the O2 encloses a volume of 2.2 million m3 (77.7 million cu ft). The dome-shaped roof is what's known as a cable-suspended membrane – a complex web of tensioned cables supported by twelve 95 m (312 ft) steel masts that stick out above the surface of the dome. The O2's spiderweb-like net of cables is then covered with a canopy, made from millimeter-thick sheets of PTFE (polytetraflouroethylene) coated fabric which covers 80,000 m² (861,000 ft²). The O2 was designed by architects the Richard Rogers Partnership (today RSHP) and engineered by Buro Happold (both UK).