Análise da influência do diafragma externo na ligação entre viga de seção I e pilar tubular de seção circular

• Autor(a) principal: Orrico, Ana Carolina Scampini Rangel
• Data de Publicação: 2018
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Espírito Santo (riUfes)
• Texto Completo: http://repositorio.ufes.br/handle/10/10688
• topic: External diaphragm; Beam-column connection; Tubular structure; Numerical analysis; Steel structure; Diafragma externo; Ligação viga-pilar; Perfil tubular; Análise numérica; Estrutura de aço; Engenharia Civil; Diafragma (Engenharia estrutural); Vigas; Colunas; Análise numérica; Aço - Estruturas; 624

The use of external diaphragms in connections between I-beams and circular hollow section columns aims to improve efficiency of the transmission of forces and moments between these two elements. The study of diaphragms began in Japan in the 1970s, where theoretical work and experimental analysis of its application were made. In Brazil research dates to 2005, when Carvalho (2005) performed the first numerical analyzes of a connection both with and without the diaphragm. The Brazilian standard ANBT NBR 16239:2013 does not address the design of this type of connection, which is contemplated only by Kurobane (2004) in the Comité Internacional pour Le Développement et l’Etude de La Construction Tubulaire (CIDECT). The objective of this study is to analyze the behavior of external diaphragms in the connections between I-beams and circular hollow section columns. Numerical analysis was performed exploring a range of geometries for the external diaphragm and evaluating the effectiveness of the connection when both the beam and the column are loaded. The diaphragm proved to be an effective mechanism to increase the initial stiffness and the ultimate strength of the connection providing resistance gains ranging from 30 to 173%, depending on the geometry of the parts. When the column is submitted to axial loading, the model without diaphragm the value of the ultimate bending moment resistance presents a gradual reduction between 3.2% (for the smallest diaphragm) and 17%.