Avaliação de ligações tubulares tipo T entre CHS com reforço tipo chapa.

• Autor(a) principal: Pedreira, Luciana Baptista
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/11604
• topic: Civil Engineering; Hollow Section Joints; Numerical Analysis; Finite Element Analysis; Non-Linear Analysis; Engenharia Civil; Ligações Tubulares; Análise Numérica; Método dos Elementos Finitos; Análise Não-Linear; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL

Seamless tubular profiles are used in several countries, mainly due to the advantages associated to aesthetics, high torsional stiffness and ability to sustain axial loads and combined effects. Canada, England, Germany and the Netherlands frequently use these structures having a continuous industrialized production with high level of technological development. In the past few years the use of these elements in Brazil was practically limited to 3D trusses. This scenario has changed due to the increased use of these types of structures ratifying the pressing needs for studies associated to their structural response and in particular, the complete understanding of their structural joints. In order to provide guidelines for the design joints a Brazilian standard was recently approved for tubular joints structural design. Within this perspective, the present study presents an analysis of "T" tubular joints with circular hollow sections (CHS) based on the Eurocode 3, CIDECT, NBR 16239: 2013 and ISO 14346. A finite element model for each joint type was developed in the Ansys program. These models were calibrated and validated against experimental and numerical results present in the literature. The results proved the substantial influence of the flange compression forces over the joints overall behaviour. Physical and geometrical nonlinearities were incorporated into the models in order to fully mobilize their structural capacity. The material nonlinearity was considered by the adoption of the von Mises criteria and a bilinear stress versus strain response to represent an elastic-plastic strain hardening behaviour. The geometric nonlinearity has been introduced into the model through Updated Lagrangian formulation. The numerical analysis results were compared to the design standard predictions results and proved the conservatism of the design equation values. Finally, correction factors were proposed to the standard design equations to better match them to the numerical results.