Mechanical response of tensegrity dissipative devices incorporating shape memory alloys

Narinder Singh, Ada Amendola, Filipe Amarante dos Santos, Gianmario M. Benzoni, Fernando Fraternali

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Abstract

To optimize the seismic performance prescribed by modern structural codes, buildings and infrastructures must provide adequate safety for design level earthquake excitations, with limited levels of damage. This paper deals with the computational modelling of a bracing system with tensegrity architecture, which operates as a lightweight mechanical amplifier of longitudinal displacements in the transverse direction, efficiently limiting the interstory drifts while dissipating energy. The proposed brace is based on a D-bar tensegrity structure with a rhomboidal shape comprising Shape-Memory Alloy (SMA) tendons. The SMA tendons can develop austenitic-martensitic (solid to solid) transformations, which enable them to amplify the signals into wide super elastic hysteresis, while subjected to mechanical cycles, comprising strains up to 6÷8%, with no residual deformations. The enhanced energy dissipation of the proposed SMA-D-bar (SMAD) braces are demonstrated through computational simulations of the response of braced frame to real earthquake events. The efficiency of the intended bracing to minimize the seismic impact of the served structure lays the foundation for the development of novel seismic energy dissipation systems integrating principles of tensegrity with superelasticity.

Original languageEnglish
Article number012001
JournalIOP Conference Series: Materials Science and Engineering
Volume999
Issue number1
DOIs
Publication statusPublished - 18 Dec 2020
Event7th International Conference on Mechanical, Materials and Manufacturing, ICMMM 2020 - Washington, United States
Duration: 25 Sep 202027 Sep 2020

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