{"id":1258,"date":"2023-07-18T06:00:59","date_gmt":"2023-07-18T06:00:59","guid":{"rendered":"http:\/\/bambutec.com.br\/?p=1258"},"modified":"2023-07-21T21:29:18","modified_gmt":"2023-07-21T21:29:18","slug":"active-bending-and-tensile-pantographic-bamboo-hybrid-amphitheater-structure","status":"publish","type":"publicacao","link":"https:\/\/bambutec.com.br\/en\/publicacao\/active-bending-and-tensile-pantographic-bamboo-hybrid-amphitheater-structure\/","title":{"rendered":"Active bending and tensile pantographic bamboo hybrid amphitheater structure"},"content":{"rendered":"

Journal of the International Association for Shell and Spatial Structure Vol. 58 No. 3, 2017. Access<\/a> >><\/p>\n\n\n\n

M. Seixas; J. Bina; P. Stoffel; J.L.M. Ripper; L.E. Moreira; K. Ghavami<\/p>\n\n\n\n

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\u202fGPa for Young's modulus (E), a specific gravity (G) of 8 kN\/m\u00b3\u202f, and a Poisson's coefficient (\u03bd) 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\u202fkN and the asymmetric loading of 3.5\u202fkN, whereas failure occurred at a total load of 6.5\u202fkN 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.<\/strong> The present paper describes the design process of a textile hybrid bamboo amphitheater dome built in the tropical climate of Brazil, employing a mobile free-form space structure spanning a 17 x 12m area. The structural system is designed applying pantographic gridshells pre-stressed by acrylic membranes and braced by self-stressed active bending beams reinforced by steel cables and strut scissors, avoiding buckling of the members. The structural system consists of an adaptable supporting space structure using hinged bamboo bipods. The connection of the structural modules on a free-form geometry has a self-stabilizing behavior, therefore reducing the use of heavy foundations. Flexible hinged lashed joints with textile-based techniques were developed. A form-finding method based on the developed physical models established the topology of the building site, generating the assembly procedure. The full-scale model was constructed on the inclined site at the banks of the Rainha River at the campus of the Pontifical Catholic University of Rio de Janeiro, PUC-Rio. The modular space structure was mounted in stages on the ground, then erected with the aid of lifting bipods, without the need of cranes and heavy machinery. The 200m\u00b2 built structure had a weight of 14 kN corresponding to 0,07 kN\/m\u00b2, consisting a sustainable ultra-lightweight space structure.<\/p>\n\n\n\n

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Journal of the International Association for Shell and Spatial Structure Vol. 58 No. 3, 2017. Clique para acessar >> M. Seixas; J. Bina; P. Stoffel; J.L.M. Ripper; L.E. Moreira; K. Ghavami Resumo: The present paper describes the design process of a textile hybrid bamboo amphitheater dome built in the tropical climate of Brazil, employing a mobile free-form space […]<\/p>","protected":false},"featured_media":1335,"template":"","format":"standard","categories":[52],"tags":[35,16,82,38,81,37,47,71],"class_list":["post-1258","publicacao","type-publicacao","status-publish","format-standard","has-post-thumbnail","hentry","category-publicacoes","tag-active-bending","tag-bamboo","tag-biomaterials","tag-deployable","tag-gridshells","tag-pantographic","tag-space-structure","tag-textile-hybrid"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/publicacao\/1258","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/publicacao"}],"about":[{"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/types\/publicacao"}],"version-history":[{"count":14,"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/publicacao\/1258\/revisions"}],"predecessor-version":[{"id":1879,"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/publicacao\/1258\/revisions\/1879"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/media\/1335"}],"wp:attachment":[{"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/media?parent=1258"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/categories?post=1258"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/tags?post=1258"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}