Double‐Layer Tensegrity Grids: Static Load Response. Part I: Analytical Study

Abstract

Tensegrity structures are freestanding prestressed cable networks in which the cables are prestressed against a discontinuous system of bars. In double‐layer tensegrity grids (DLTGs), the bars are confined between two parallel layers of cables. This paper presents the analytical part of an investigation of a type of DLTG. A first‐order linear analytical model indicates that these structures possess low stiffness and low bar force efficiency. Under full prestress, determined by the condition that no cable is slack under the applied load, the model predicts deflections of approximately 1/20 of the span, and 20% of bar load‐bearing capacity is available for the applied load, the rest being required by prestress. Member forces and deflections are strongly affected by the span, structural depth and level of prestress. Enhancement techniques are discussed.