Deployable double layer tensegrity grid platforms for sea accessibility: Fid-Bau Portal

Deployable double layer tensegrity grid platforms for sea accessibility

Hrazmi, Issam / Averseng, Julien / Quirant, Jérôme / Jamin, Frédéric

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Highlights • A deployable tensegrity structure is developed as solution for sea accessibility. • Structural modules are foldable and reconfigurable through specific mechanical design. • Self-stress level and support conditions are optimized using a numerical model. • Experimental work demonstrates the modularity and feasibility of this solution.

Abstract Tensegrity systems are a class of reticulated space structures composed of compressed bars maintained in equilibrium by a network of tensioned cables. Their stiffness depends both on elements’ mechanical properties and their internal self-stress state. Taking advantage of their structural properties, we respond to the challenge of accessibility for everybody to the sea with a new concept of modular lightweight and deployable platforms. Variable configurations are developed to fit ecologically into the marine environment thanks to the transparency of double layer tensegrity structures. Moreover, allowing practical assembly and disassembly is considered in the design to respect the coastal law. Through a numerical study, we demonstrate in this paper the capability of this solution under various representative load cases and support conditions. After the structural and design optimization of elements constrained by weight and stiffness, we detail the design of the nodes, which are the key components ensuring geometry and foldability of the structure. Finally, on-site setting and interfacing with ground supports is experimented in marine conditions to proof the feasibility of this concept.