Double-Layer Tensegrity Grids as Deployable Structures

Tensegrity grids are internally prestressed cable networks, in which the cables are prestressed against a disjointed system of bars. These structures are inherently collapsible and deployable in the nonprestressed state. In double-layer tensegirity grids, the bars are relatively short, producing a compact packing in the collapsed state. In the deployed prestressed state, geometrically rigid as well as geometrically flexible configurations are feasible. Flat or curved surfaces can be generated. Deployability and prestress are achieved through the extension of bars, shortening of cables or a combination of both techniques. A description of the system and some analytical results and deployable models are presented.