Análise teórica e experimental de conectores de cisalhamento e vigas mistas constituídas por perfis de aço formados a frio e laje de vigotas pré-moldadas / Theoretical and experimental analysis of shear connectors and composite beams constituted of cold-formed steel beams and floor system with lattice girder beams

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

In Brazil, the lack of hot-rolled members and high cost of welded steel beams have increased the use of composite beams made of cold-formed steel beams and floor system with lattice girder beams, whose structural behavior is not perfectly understood. Although this system is similar to the one composed of hot-rolled steel beams and concrete slabs, it is important to study its structural behavior due to some reasons: (i) the shear connectors must have structural and constructive compatibility with the beams they are connected, (ii) the small rotations of the steel beams jeopardize the concept of total yielding of composite section, which is currently used to evaluate the resistant moment, (iii) the complexity in placing the conventional shear reinforcement. This work presents an experimental and theoretical analysis on channel cold-formed connectors and composite beams made of cold-formed steel beams and concrete slabs with lattice girder beams. The push out tests of shear connectors evaluated the influence of their height and thickness on strength and stiffness of the system, and made possible to adjust the empiric expression of AISC:2005, originally developed for hot-rolled channel connectors, to fit the behavior of cold-formed connectors. Additionally, the influence of transverse reinforcement, relative position of connectors to lattice girder beams and interface slippage on vertical displacements were evaluated through numerical and experimental analysis. The results showed that the resistant moment is smaller than the calculated considering total yielding of the cross section. Besides this, the position and amount of transverse reinforcement amount have strong influence on crack configuration but not on the strength of the system.

ASSUNTO(S)

análise experimental de estruturas vigas numerical analysis steel structures composite structures experimental structural analysis estruturas mistas análise numérica beams estruturas de aço

ACESSO AO ARTIGO

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