Análise experimental da resistência à flexão simples de vigas de aço tipo "I" compostas de perfis laminados dotadas de emendas soldadas

• Autor(a) principal: Borges, Rone Sergio Freitas
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/5017
• topic: Viga; Aço; Ligações soldadas; Ligações parafusadas; Perfil laminado; Flexão simples; Beam; Steel; Welded joints; Bolted connections; Laminate profile; Simple bending; ENGENHARIA CIVIL::ESTRUTURAS; ENGENHARIAS::ENGENHARIA CIVIL

In Brazil, despite the skilled labor shortage, the use of metal structures in buildings has increased considerably due to factors such as speed of execution, cleaning the construction site, low deadweight compared with reinforced concrete structures, low material waste, etc. For better utilization of equipment and for which continuity of the openings is necessary to use the amendments, which can be welded or screwed. The quality of the amendments must meet the standards required by the design standards, in rolled profiles, according to ABNT NBR 8800:2008 (Steel Structures Design and Composite Structures of Steel and concrete buildings). These profiles have great applicability in large structures and their use is growing in buildings with these characteristics. This paper presents the experimental study of bearing capacity of two beams supported by steel made of rolled profiles section I of type W 250 x 22,3 ASTM A-572, grade 50, rolled parallel flaps with two axes of symmetry, being provided splices using full penetration welds MIG type (Metal Inert Gas). Seven beams were tested with a length of 3000 mm, with a reference beam. In the remaining six beams amendments were made in different positions varying the amount of amendments. This study also provides a comparison between the results obtained in this work and those obtained by Pereira (2014), which used beams with bolted connections using the same provisions of the amendments of this work, but with ASTM A-325 and screw diameter of 19 mm. All models have been requested by simple bending stress at break, according to the analysis of vertical displacement, and torsional displacement relative specific deformations steel. The connections of beams resisted the simple bending tests not being observed no break in welds. The main contribution of this work was to show that, if well executed, welded connections and bolted performed by Pereira (2014), with the specifications described in this paper, can be used as elements of connections in steel beams subjected to bending, as well resisted the requested efforts .