In: Métodos e Processos em Biônica e Biomimética: a Revolução Tecnológica pela Natureza. Access >>
G. Victor; M. Seixas; J.L.M. Ripper
Abstract: Ultralight bamboo structures with flexible joints comprise a novel construction system that can meet the global demand for sustainable buildings, such as multi-use pavilions and temporary structures for disaster relief and humanitarian purposes. In this work, modular self-supporting space frames were designed, fabricated, and experimentally analyzed using bamboo culms, textile ropes, and biocomposite rings. Numerical models and a 1:3 scale prototype were used to investigate the structural response under sustained loadings. The mean values of 5.4 GPa for Young's modulus (E), a specific gravity (G) of 8 kN/m³ , and a Poisson's coefficient (ν) of 0.3 were adopted for the bamboo members. The prototype, constructed with two modular space frames, was tested under both symmetric and asymmetric loading conditions during 43-day static tests. A pronounced nonlinear behavior was observed for the symmetric loading of 4.8 kN and the asymmetric loading of 3.5 kN, whereas failure occurred at a total load of 6.5 kN for the asymmetric configuration, 7.5 times the prototype's self-weight. The observed failure of bamboo members was governed by crushing under bending, followed by local buckling of the upper rafters below the load application points. The experimental results were compared with numerical models to determine an effective modeling strategy for reproducing the actual structural behavior. A comparison revealed that the eccentricity of members at the joints must be considered for a reliable prediction and that creep can be accounted for through appropriate reductions in the modulus of elasticity. The observed differences are attributed to the sliding of members at joints under higher loads and due to local second-order effects. The present paper present research results in self-supporting structures employing the tensional integrity structural system applied in the design, architecture, engineering and medicine. Active methods of research and learning developed using experimental models in physical and social environments. Recent advances in research on tensegrity structures have guided the development of prototypes that introduce the biotensegrity system into sustainable architecture and in the design
of didactic models of the human body. The models developed through studies in biomimetics apply textile-based technologies and flexible connections in biomaterials, environmentally compatible and capable of absorbing forces and special loadings, which are similar to the physiological constitution of
vertebrate animals and the human body.
engenharia e medicina. Metodologias ativas de pesquisa e aprendizagem foram desenvolvidas
utilizando modelos experimentais no meio físico e social. Recentes avanços nas pesquisas em
estruturas tensegrity orientaram o desenvolvimento de protótipos que introduzem o sistema
biotensegrity na arquitetura sustentável e no desenho de modelos didáticos do corpo humano. Os
modelos desenvolvidos através de estudos em biomimética aplicam tecnologias têxteis e ligações
flexíveis em biomateriais, apropriados ao ambiente e capazes de absorver esforços e cargas
especiais, que se assemelham à constituição fisiológica dos animais vertebrados e do corpo humano.
