3D tensegrity braces with superelastic response for seismic control

Archive ouverte : Article de revue

Santos, Filipe | Caroço, Catarina | Amendola, Ada | Miniaci, M. | Fraternali, Fernando

Edité par HAL CCSD ; Begell House

International audience. Tensegrity structures have recently shown great potential as bracing devices for seismic control due to their unique ability to passively dissipate energy in structures subjected to severe deformations. Indeed, behaving as nonlinear springs, they are able to dissipate a great amount of energy energy during mechanical loading-unloading cycles. Planar tensegrity D-bar systems composed of four bars forming a rhombus, internally stabilized through a set of two perpendicular Shape Memory Alloy (SMA) cables, represent excellent candidates to act as braces for seismically resistant structures. However, although their tapered configuration maximizes in-plane buckling resistance with minimal mass, the out-of-plane buckling of such systems can compromise their overall structural efficiency, potentially engendering damage into adjacent non structural elements. In this paper, the efficiency of three-dimensional D-bar tensegrity structures under compressive loads is examined with the aim of proposing an advantageous design of D-bar-based bracing systems with optimized masses. We show that, by introducing a pre-strain in the superelastic cables, it is possible to achieve a wide shaped hysteresis, which yields to a significant amount of equivalent viscous damping (up to 30%). The presented numerical results on the energy dissipation properties of the examined structures, corroborated by experimental measurements of the buckling response, shed light on the research field of three-dimensional tensegrity structures, as efficient and lightweight bracing devices for seismic control.

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Biographie

Louis Leboucher, dit Georges Mounin, est un linguiste français né le 20 juin 1910 et mort le 10 janvier 1993, professeur de linguistique et de sémiologie à l'Université d'Aix-Marseille. Il s'est souvent déclaré fervent disciple du linguiste français André Martinet. Ses œuvres traitent d'un vaste ensemble de sujets, allant de l'histoire de la linguistique à la définition de celle-ci et de ses branches et problèmes traditionnels (sémiologie, sémantique, traduction...) à sa relation avec d'autres domaines de connaissance (philosophie, littérature, dont la poésie en particulier, société). Marxiste strict dans le domaine social et historique, il fut également un spécialiste de l'Italie de la Renaissance. Selon le critique Gaëtan Picon, Avez-vous lu Char ? de Georges Mounin est le premier commentaire d'ensemble du poète René Char et témoigne de la vénération minutieuse que porte le linguiste au poète. Le bibliste Roland Meynet a fait partie de ses élèves. Il est signataire du Manifeste des 121 sous-titré « Déclaration sur le droit à l’insoumission dans la guerre d’Algérie », paru en septembre 1960.