Análise teórica e experimental de treliças metálicas espaciais constituídas por barras com extremidades estampadas

Maiola, Carlos Henrique

doi:10.11606/d.18.2017.tde-11122017-113502

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…Research by Maiola (1999) shows, with experimental analysis, why flat end bars should be avoided, although they do provide a simple solution for reticulated metallic structures.…”

Section: State-of-the-artmentioning

confidence: 99%

“…It is, however, known to be quite expensive, especially in Brazil, turning some constructions unfeasible. The flat-end bars, shown in Figure 15a, that are joined with a bolt is inexpensive, however, structural safety uncertainties surround this type of system (Maiola 1999). It is only natural that, with the ever more available manufacturing techniques, new types of systems will be developed.…”

Section: Connectionsmentioning

confidence: 99%

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Development of a new connection system for reticulated shell structures using parametric modeling and digital fabrication.

Oliveira¹

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Lightweight structures in grid form made of bar elements joined together with nodes are called reticulated shells, or gridshells. Different gridshell structural systems are studied, and a new connection system and method for generating this system are proposed. The connection system applies to structures with surfaces that have a high variability of curvature and connection parameters. Prior to the development of such a connection, the choices of materials, existing types of connections, grid patterns, cladding systems, optimization methods, and structural analysis evaluation are presented. Each enumerated aspect enables a well-reasoned development of the connection. The connection uses standardized hub geometries and interconnecting parts. The bars of the structure connect to the hubs through these interconnecting parts, which absorb varying parameters of the connection, such as incidence angle, twist angle, adjacency angles, and the fabrication tolerance of bar lengths and bolted connections. The aim is to provide a system that can be assembled quickly, disassembled and reused. A parametric modeling environment is used to model global and local geometry of meshes and nodes. Inputs for the programmed parametric definition include a mesh, geometry of the hub notch, and bars cross-sections; outputs include bar lengths, interconnecting parts geometries, and assembly information. A structural stability analysis is conducted with parametric finite element software. A small-scale physical model is presented, serving as a proof of the concept developed within the computational modeling environment. The scalability of the model is discussed, taking as a starting point the experience of the production of the small-scale model. Tensile tests results of the printed material and connection are provided.

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“…Research by Maiola (1999) shows, with experimental analysis, why flat end bars should be avoided, although they do provide a simple solution for reticulated metallic structures.…”

Section: State-of-the-artmentioning

confidence: 99%

Section: Connectionsmentioning

confidence: 99%

Development of a new connection system for reticulated shell structures using parametric modeling and digital fabrication.

Oliveira¹

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Análise numérica, via MEF, de ligações em treliças metálicas espaciais

Sampaio¹

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As treliças espaciais vêm sendo freqüentemente utilizadas, de forma bastante diversificada, mas seu principal uso é como cobertura de grande vãos.Recentemente, vários acidentes com este tipo de estrutura têm acontecido, principalmente devido a uma série de considerações adotadas para dimensionamento, as quais não condizem com a realidade. Neste contexto, foi feito um estudo do comportamento seguido por estas estruturas. Este trabalho apresenta uma análise teórica, via método dos elementos finitos, de modelos de treliça espacial de seção tubular circular. Tem como objetivo verificar o comportamento de cada sistema de ligação, modelado tridimensionalmente com elementos de casca, associado à treliça espacial, modelada em elementos lineares. Foram estudadas as tipologias usuais de ligação deste tipo de estrutura abordando os problemas causados pelas peculiaridades de cada sistema. Palavras-chave: treliça espacial, sistemas de ligação, variação de inércia, análise numérica, método dos elementos finitos. SAMPAIO, T. S. (2004). Numerical analysis, using FEM, of connections in metallic space trusses. M.Sc. Dissertation -Escola de Engenharia de São Carlos, Universidade de São Paulo, São Carlos, 2004.Space trusses have been very frequently used in many applications, but its main employment is as roofs of great areas. Recently, many accidents have been occurring with this type of structure, mainly because of a series of adopted design assumptions, which does not fit reality. In this context, the behavior of this type of structure was studied. This study presents a theoretical analysis, using finite element method, of space trusses composed by circular tubular sections. It has as an objective to verify the behavior of each connection system, modeled in 3D by shell finite elements, associated to a space truss, modeled in linear finite elements. The usual typology of connections used in this kind of structure was studied, considering the problems caused by peculiarities of each system.

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Análise teórica e experimental de treliças metálicas espaciais constituídas por barras com extremidades estampadas

Cited by 2 publications

References 19 publications

Development of a new connection system for reticulated shell structures using parametric modeling and digital fabrication.

Development of a new connection system for reticulated shell structures using parametric modeling and digital fabrication.

Análise numérica, via MEF, de ligações em treliças metálicas espaciais

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