Tensegrity

A structural principle of discontinuous compression and continuous tension, named by Buckminster Fuller.

Tensegrity — a portmanteau of "tensional integrity," also called floating compression — is a structural principle in which isolated rigid members held in compression (struts or bars) never touch one another but are instead suspended within a continuous network of tensioned elements (cables or tendons). Because every member carries only pure compression or pure tension, no part experiences bending or shear, allowing such structures to be exceptionally strong and rigid for their mass. Buckminster Fuller coined the term in the 1960s; he held U.S. patent 3,063,521, "Tensile-Integrity Structures" (1962), among others.

The concept emerged from the intersection of Fuller's work and that of the artist Kenneth Snelson, who preferred the name "floating compression." In 1948, after studying at Black Mountain College where Fuller lectured, Snelson produced his innovative "X-Piece." That innovation prompted Fuller to commission a mast from Snelson, and by 1949 Fuller had developed a tensegrity icosahedron, applying the technology with his students to dome-building. Credit for the underlying idea remains contested: some historians trace precedents to the Latvian Constructivist Kārlis Johansons (Karl Ioganson), whose 1921 work appears to foreshadow the principle.

Tensegrity has since spread far beyond sculpture and domes. Architects have used it in stadium roofs such as the Georgia Dome and Seoul's Olympic Gymnastics Arena, and in the Kurilpa Bridge in Brisbane, the world's largest tensegrity bridge. Roboticists build lightweight, impact-resilient machines like NASA's Super Ball Bot on tensegrity frames. In biology, Donald Ingber's cellular models and the broader field of "biotensegrity" apply the principle to cytoskeletons, musculoskeletal systems, and self-assembling molecules — extending Fuller's insight that tensioned members trace the shortest geodesic paths and so resist stress with minimal material.

See Also

• R. Buckminster Fuller (R. Buckminster Fuller) — the central figure
• Kenneth Snelson (Kenneth Snelson) — sculptor whose "floating compression" shaped the idea
• Synergetics (Synergetics) — Fuller's geometric system in which tensegrity is embedded
• Black Mountain College (Black Mountain College) — where Snelson and Fuller intersected

Sources

• Tensegrity