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Tensegrity Structures

Through his extensive research, inventions and structural experiments, Buckminster Fuller coined the term tensegrity to describe "self-tensioning structures composed of rigid structures and cables, with forces of traction and compression, which form an integrated whole". In other words, tensegrity is the property shown by a system that employs cables (traction) and rigidity of other elements (usually steel, wood or bamboo) capable of acting under the intrinsic stresses (traction and compression) together and simultaneously, offering greater resistance and formal stability. It creates an interconnected structure that functions biologically like muscles and bones, where one element strengthens the other.

For Georgia Victor, "It is used today to explain the organization of the elements that make up living beings according to the characteristics of their geometry. This spatial organization forms a continuous field of tensions and compressions in constant equilibrium, in a game of tensions with the force of gravity."

In general, the system works by joining opposing forces and, according to Fuller, it is the "structural basis of nature; capable of, with a minimum of elements, forming a strong structure". American contemporary sculptor Kenneth Snelson - a former student of Buckminster Fuller's - played a key role in the development of the structural system, working with pieces composed of rigid and flexible components.

Snelson's work that best showcases the system is the Needle Tower, a sculpture made in 1968 measuring 18 meters high, 6.18 wide and 5.42 meters long that allowed Fuller to theoretically develop the idea from tensile integrity analysis. The geodesic dome designed by the architect already hinted toward the notion of the tensile structures in 1948, despite the difficulties in the assembly process of the prototype which stood only for a few minutes.

Rigid bars act on compression forces and are arranged in an isolated, non-touching manner, complimenting the steel cables that receive tensile forces. The concept was further expanded, incorporating "structures that may not be self-balanced, but which contemplate the principle, formed by tension cables and compressed bars isolated from each other" like Fuller's geodesics.

The system has been attracting the attention of researchers, as Deifeld and Pauletti say. According to the authors, the largest architectural structure to utilize the system is the roof of the Georgia Dome in Atlanta, Georgia. Recent research, such as that of Kuan-Ting Lai termed "Reconfigurable Tensegrity Systems," seeks to explore the possibilities of using the principles to construct a structural system that can be reconfigured later from a comprehension of the basic rules of the system, with the construction of a prototype of pneumatic cylinders and polycarbonate panels demonstrating this showing the potential.


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